A couple of months ago, I decided to start learning Python.
I say “start” because, as a hobby to fit in between my personal schedule and work for the site, learning the language is still very much a work in progress. I hope I’ll get to an acceptable level of knowledge someday. Coming from AppleScript, another language I started researching and playing with earlier this year, the great thing about Python is that it’s surprisingly easy to pick up and understand. As someone whose job primarily consists of writing, I set out to find how Python could improve my workflow based on text and Markdown; I found out – and I’m still finding out – that Python allows for more flexible and intelligent string manipulation and that some very smart folks have created excellent formatting tools for Markdown writers.
But this article isn’t strictly about Python. Soon after I took my decision to (slowly) learn my way around it, I asked my friend Gabe Weatherhead about possible options to write and execute Python scripts on iOS. Thanks to Gabe’s recommendation I installed Pythonista, and this app has completely changed my iOS workflow.
The iOS Workflow
A bit of backstory first.
The fact that I immediately wondered whether it’d be possible to “do Python” on iOS shouldn’t be a surprise. For the past 12 months, due to changes in my personal schedule, I’ve been forced to rethink my workflow entirely. With a focus on plain text and Markdown, I set out to find ways to ensure I would be able to get work done on iOS devices without limitations. I wanted to get the “I need a Mac for this” daily problem out of the equation; I wanted to be able to do the same work on all my devices. I wanted to automate tedious tasks I was doing every day; ultimately, I consolidated my workflow around devices and software I trust to get work done for me. I wanted the best for me.
I got a 3G iPad with Retina display, so I could put less strain on my eyesight and work from anywhere independently of availability of WiFi hotspots; I got a 32 GB model so I could comfortably cache music and podcast episodes on it. I upgraded my iPhone 4S to an iPhone 5, as I knew the improved cellular options and new antenna would let me get a signal in places – such as hospital corridors – where I knew I wouldn’t be able to work with “regular” 3G.
I didn’t get the best options available for iOS devices: I bought the models that I knew wouldn’t let me down in case of necessity.
From a software standpoint, I got rid of apps that I wasn’t using regularly or that hadn’t been updated in a long time. If I were to reconstruct my workflow – and therefore, indirectly, my income – on a solid software foundation, I needed to do so with developers I could trust. I picked my weapons carefully: I realized plain text was my preferred way of writing and Dropbox my favorite cloud filesystem, so I combined them. It also helped that the Markdown/plain text community is fervent, passionate, and active. I chose iCloud to sync my personal information and settings for apps that support it, such as Downcast or Due. I understood that Evernote wasn’t meant to be a Markdown editor, so I started using it for what it’s really great at: collecting rich notes with images and other reference material. In trying new apps and services, I carefully selected the ones that came with native OS X and iOS apps, possibly with sync; those who follow me on Twitter know that I strive to find services that are ubiquitous and reliable, even when people tell me “you don’t need that on the iPad”.
I need my iOS devices (and especially my iPad) to allow me to get work done from anywhere.
Curating apps that enhance my workflow and finding software I can trust with my data isn’t simply my job as a “reviewer”: it’s an investment for the future of my business. The fact that I take pleasure out of writing about software is a different matter.
I was all set up: I had my plain text workflow with Dropbox, everything else in Evernote, my podcasts and music synced and cached. I had a few games, Twitter clients with sync, communication with my team happening through iMessage. I’m surprised I didn’t think of hooking up my car with the cloud, honestly. 
The experiment failed miserably. I started taking the iPad with me to write and publish posts for MacStories, but I was constantly reaching out to my MacBook Air in the other bag. So I stopped carrying the MacBook altogether: too bad one day I had to post a piece of news quickly, and got stuck on creating and uploading the image I needed for the article.
I spent entire weeks thinking about how to solve the issue. Eventually, I came to the realization that I didn’t need more apps, I needed a system to automate iOS. I was missing the little scripts and shortcuts and macros that, for power users, make OS X computers powerful machines to get work done quickly and efficiently. I was missing my automation setup: my Keyboard Maestro, my Alfred, my Hazel. Little things quickly add up: Markdown links take longer to put together and screenshots don’t come out like I want them to. Losing all my scripts and macros in the transition to iOS meant I could only do some things, and not as fast as I would on a Mac. I needed to fix it.
I turned to my friend Gabe. Over at Macdrifter, Gabe writes about “Mac and iOS related material with a slant towards the technical”. Macdrifter is, by far, my favorite tech/indie blog of 2012: Gabe doesn’t write rumors or linkbait; he links to stuff he finds interesting and only reviews software he actually uses. Even better, he comes up with tips and workflows that are very specific (the so-called “niche”) but also incredibly useful.
Initially, Gabe introduced me to Nebulous Notes, a Markdown text editor that works with Dropbox and has support for macros. It has become my default text editor after a couple of weeks of experiments. This is the result of fine-tuning the app to my own needs.
Later, I pinged Gabe about my interest in Python, and he suggested I’d take a look at Pythonista, developed by Ole Zorn. I’m glad I did: Pythonista has profoundly changed the way I approach iOS devices when I know that work needs to be done. I’m not afraid to leave my MacBook at home; in fact, several of the posts published on MacStories in the past month have been produced entirely from an iPad.
Let me show you how I achieved iOS workflow nirvana.
I’ve previously written about my writing workflow; you can, however, find more recent additions here and here. As far as iOS is concerned, the biggest change was Nebulous Notes, which, like I said, altered my perception of iOS text editors thanks to macros. If I need to write a blog post on the iPad or iPhone, I can’t use any other app.
I have very specific needs when it comes to “work”. In an unordered list of importance:
- I need to publish blog posts to WordPress.
- I need to generate valid HTML for the Markdown I write my posts with.
- I want to visually preview the Markdown text to make sure the layout of the post is right.
- I need to upload images to our CDN.
- I need to convert images to another format and change their output quality.
- I need to upload images to Dropbox quickly.
- For articles that include iPhone screenshots, I want those screenshots to look like this.
- Once I have the link to an image, I need to generate the proper
imgHTML for MacStories.
- Occasionally, I may have to download files.
- I generally create reminders for things I have to do in OmniFocus or Due.
- I bookmark links I find interesting with Pinboard.
On the Mac, these tasks are made simple by Sublime Text 2 and the Finder. As I’ve previously outlined, Sublime Text can be extended with some fantastic Markdown-related plugins; with the Finder, I can easily upload images from the Desktop to our CDN, I can access any Dropbox file thanks to the Dropbox app, and, when it comes to quick image modifications, I’ve come to trust Acorn and Keyboard Maestro to do the heavy work for me.
Pythonista is a Universal app for writing and executing Python scripts on iOS. There are some differences in terms of navigation and interface between the iPhone and iPad versions, but, overall, Pythonista is consistent across both platforms.
Like any respectable code editor, Pythonista comes with features like syntax highlighting and code auto-completion. For highlighting, there are six color themes to choose from in the Settings, including two Solarized options (dark and light); in the Settings, you can also change the editor font (Adobe’s new Source Code Pro is available), font size, line spacing, and tab width.
Code completion is my favorite feature of Pythonista’s editor. For someone like me who’s just getting started with Python, the app offers an unobtrusive yet highly convenient way to auto-complete your code: suggestions appear directly above the keyboard and they’re colored according to your color scheme. When typing, you can tap on the “auto-complete bubble” to let Pythonista complete your code; code completion is also smart in that only functions/class names/etc related to a module you’ve imported will be suggested.
Code completion can be deactivated in the Settings alongside other options enabled by default. You can set Pythonista to highlight matching
(), which is a nice feature to have as it provides a subtle hint to confirm you’ve matched parentheses in the right way. But what I really like is auto-pairing: characters like parentheses, square brackets, and single/double quotes will be matched with closing characters automatically. If you’re coming from nvALT or Sublime Text 2, you should be familiar with this option. For instance, if you beging typing
( a closing
) character will be immediately put on the right, with the cursor in the middle ready to type. Or, if you select text and hit
( the entire text will be wrapped inside
Character pairing can be confusing to some people, but I find it extremely handy. It speeds up my typing considerably.
Typing in Pythonista, however, is also aided by the extra row available above the standard iOS keyboard. First introduced by iA Writer for iPad, Pythonista follows the trend of several Markdown editors and puts often-used characters directly above the main keyboard, so you won’t have to open the numeric or math keyboard when writing code. These characters include the usual suspects (quotes, parentheses, tab, etc), but with a spin: on the iPhone, due to the smaller screen, the extra row has been “split” in two modes that you can switch with a button on the right. The second mode is where you’ll find the app’s Undo function.
The extra keyboard row has two more tricks up its sleeves. First, most keys can be long-pressed to reveal additional keys in a popup: Undo becomes Undo/Redo and single quotes become single/double quotes and percent sign.
Additionally, Pythonista uses the extra row as a swipe area for the “Hooper Selection” made popular by a concept video earlier this year. Swipe selection only works with one finger (and you can’t move up/down through empty lines), but it’s still a nice touch to make editing quicker and more touch-oriented.
With a combination of code completion, character auto-pairing, extra keyboard row, and swipe selection, I find writing code in Pythonista intuitive and accessible. The fact that everything’s entirely touch-based gives the code editor a feeling of “manipulation” that I haven’t seen in desktop editors.
[Update]: There’s a search field in the code editor; you can also navigate your code’s structure from a document browser available in the top title bar.
Pythonista lets you organize scripts in the Script Library. There are two views to choose from: a “snippet view”, which lets you see scripts as thumbnails with a preview of the first lines of code, and a more traditional list view. Both views can be sorted by name or modified date; you can add scripts with a + button at the top and delete existing ones by tapping on the Edit button.
A downside of Pythonista is that the Script Library doesn’t offer further organizational features to better sort your scripts. You can’t create folders, and it gets pretty confusing in snippet view; for the time being, I’m using list view, but it takes time to find scripts. I would definitely welcome an option to organize scripts by category or purpose.
Due to restrictions imposed by Apple, Pythonista can’t have a sync feature to import executable code from external sources like Dropbox. You can export, but you can’t import – not even from iTunes.
There is, of course, a workaround. Developer Ole Zorn came up with a way to create new scripts off GitHub Gists: make sure you have a Gist URL in your clipboard, run the script, and you’ll have a new Python script in your Library. Alternatively, the Pythonista Community Forums are already filling up with ideas to simply click a bookmarklet to make the Gist importing process even easier. Overall, there’s no doubt Pythonista could use easier importing options, but unfortunately that is not allowed by Apple. Maybe someone will create a script to import a public .py file stored on Dropbox.
Personally, keeping scripts in sync between the two versions of Pythonista and my Mac (therefore Dropbox) is what makes me waste the most time in the app. There’s no way around the fact that you’ll need to organize files manually.
For someone who’s getting started with Python, Pythonista’s best feature is the in-app documentation. Available in a Help menu from the Script Library or code editor, it is based on the official Python 2.7 documentation and it has been reformatted for the iPad and Pythonista. The documentation browser has a Home button to go back to the initial screen, arrows to go back/forward, and a search box. There’s also a button to open a page’s Table of Contents and jump to a section directly, though this is only available on the iPad.
The documentation comes with a full Language Tutorial, Library Reference, Linguage Reference, Global Module Index, General Index, and Glossary. The Tutorial and Reference guides are fantastic tools to start learning Python right inside the app. Ole enhanced code snippets to include “Copy” and “Open in Editor” buttons that will let you easily copy code samples and play around with them in the editor.
The documentation is directly integrated into the code editor. Simply select any class, module, or Python term, hit Help, and a popover (on the iPad) will show the relevant documentation entries in an inline Quick Help menu. Tap, and the Quick Help will jump to the result, highlighting it. On the iPhone, Quick Help is shown in a standard view overlaying the code editor; on the iPad, you can expand the Quick Help popover to a full window with one tap.
Don’t underestimate the convenience of readily-accessible inline documentation: especially on the iPad, and again, especially when you’re not a master of Python, it’s incredibly handy to be able to quickly check out proper module names and syntax.
Pythonista’s console deserves a mention too. Available with a single swipe to the left from the editor (grab the handle on the right side and pull), the console is where ouput gets printed and results are displayed. There’s an interactive prompt (with command history) to try out Python scripts quickly, and the same text field is also used for
raw_input when you need to enter text manually in the console.
Pythonista and iOS
Pythonista supports several modules of the standard Python library, but, due to limitations of iOS, it can’t support everything a desktop Python installation can. Aside from importing external modules and libraries – something anyone can do with Python on a computer – Ole had to come up with specific and clever ways to let Pythonista access data outside of its confined app sandbox.
For example, you won’t be able to programmatically read files from the filesystem on iOS: there’s no “Desktop” or “Documents” folder to read from on iOS. For the same reason, you won’t be able to “save” files to specified locations on your local filesystem, as Pythonista can’t break open the sandbox and, say, process a file for GoodReader.
However, not all hope is lost. If you think about it, there is one layer of data that is constantly shared across iOS apps: the system clipboard. Text and images we copy on iOS are stored in the clipboard (also known as “pasteboard”), and they are available at a system-wide level, albeit it’s up to the single developer to determine which kind of content can be pasted or copied – e.g. you can’t paste a photo into Tweetbot’s compose box.
Pythonista can read from and write to the system clipboard. The
clipboard module, in fact, has single-handedly reinvented my usage of iOS in combination with Pythonista and third-party apps. I am not dramatizing this: as I’ll explain later in this article, the possibility to read and set text strings and photos through the iOS clipboard has proven to be a simple, yet fantastic way to automate several areas of my iOS workflow. As I’ll detail, x-callback-url has also played an important role.
To overcome the limitations of iOS, Ole Zorn has tried to access every area of the system he could configure with Pythonista. The aforementioned
clipboard module can get and set text and images; there’s a
canvas module to display vector graphics, and a
scene module to draw 2D graphics and animations. There are actual, playable games developed with these modules in the built-in examples and I’ve seen users already experimenting with their own takes on graphical representations of Pythonista’s library.
There are more Pythonista modules that I’ve used in my scripts. The
console module, in particular, is one I use on a daily basis: aside from controlling text output (it can clear, set font, and set colors),
console can be used directly in the editor as well. Coming from AppleScript,
console.input_alert are reminiscent of
display dialog and
display alert in that they use native iOS alerts with buttons or text fields to enter text manually. The
console module also allows for secure input, login alerts, and, my favorite, a
show_activity command to show the standard iOS network activity indicator in the status bar. I have employed this in a variety of scripts that fetch web data.
keychain module is another powerful addition. It is secure password storage that lets you store passwords within Pythonista to reuse in other scripts. You can set passwords with
keychain.set_password and retrieve them by importing
keychain in a script and using
get_password. This is my preferred way to save passwords internally within the app without writing them as strings in a script.
sound module shouldn’t be underestimated: it allows scripts to play simple sound effects such as various version of “ding” or 8-bit inspired Arcade “jump” and “powerup”. I like how sound adds a new layer of presentation to scripts, which are otherwise primarily text based.
There are some modules that aren’t part of the Python Standard Library that are included in Pythonista. I’m using some of them in my workflow.
- bs4 — BeautifulSoup 4
- feedparser — Universal Feed Parser
- Python Imaging Library
- Requests – HTTP for Humans
editor module. I don’t use this in any of my scripts, but I believe it could pave the way for an evolution of the Pythonista engine into something different.
editor gives you access to the text of the script you’re currently editing. You can get the current selection, get selected text, replace it, or set a new selection. The syntax is simple and it allows, through a couple of lines, to do things like select & replace – with all the combined functionalities of other Python modules. If this doesn’t yet ring a bell to you, think about this: plugins for Sublime Text 2 are written with the Sublime API and are based on Python. As it stands now,
editor is a great way to automate text selections and replacements in the code editor; I can’t wait to see if this will evolve in something bigger.
The Actions Menu
The potential of the
editor module can be grasped by playing around with the Actions menu of Pythonista. Configurable in the Settings, Actions are shortcuts to scripts from Pythonista’s Library; instead of switching back and forth between the editor and the library for workflows that require multiple scripts, you can just bring up the Actions popover and run a script from there.
If you’ve created scripts that rely on the
editor module for text manipulation, it makes sense to add them to the Actions menu for easier access; I, however, have found another advantage of showing my scripts in the Actions menu – the clipboard. To concatenate scripts together, I can just make sure they write their results (usually images or text) to the system clipboard; in this way, I’ll be able to start another script from the Actions menu, as I know it will get data from the clipboard I’ve just set. Ideally, I’d like to see a future version of Pythonista with support for “workflows” – sets of “rules” that determine how data (the clipboard) should be processed by groups of separate scripts, in which order.
The URL Scheme
For the joy of URL scheme aficionados, Pythonista comes with a URL scheme. You can launch the app itself with
pythonista://, but the good stuff lies in the parameters you can pass along with the URL. Firstly, you can open a specific script using something like
pythonista://MyScript – but even better, you can open and run a script by using
pythonista://MyScript?action=run in the URL. To use this, a script with that exact name will have to be in your Library, and no other script will have to be running upon calling
The really good stuff is what you get by combining the URL scheme with command line arguments. As documented by Ole, you can pass one argument at a time by using
&args= or multiple ones with
The bookmarklet will launch my Pinboard script (more on this later) with
argv being the webpage title, and
argv as the URL.
Unfortunately, there’s no Launch Center Pro for iPad yet, but once you start thinking about the possible implementations of Pythonista’s URL scheme with web data from Safari, you’ll see how your workflow can benefit from this kind of automation.
Home Screen Shortcuts
Unsurprisingly, Ole thought of his own way to let users enjoy the convenience of the URL scheme without waiting for a decent launch manager to arrive on the iPad.
You can create Home screen bookmarks for Pythonista scripts. Simply head over this webpage created by the developer, enter your script’s name (it’s case-sensitive), hit Create Shortcut, then add the page to your Home screen using Safari’s Add Bookmark menu. The webclip will have a nice Pythonista-themed icon.
Upon tapping, a Pythonista Home screen bookmark will briefly open a blank page and then immediately redirect to the script you’ve configured in the Pythonista app. I’m fairly certain there’s no way to avoid showing a blank page for a second before redirecting to Pythonista; fortunately, it’s really just the fraction of a second, as the redirecting process is instantaneous both on my iPad 3 and iPhone 5.
I use bookmarklets for URLs I need to send to Pythonista from Safari (or iCab), but I prefer Home screen icons for data that’s been copied to the clipboard.
The Pythonista scripts I use on a daily basis are primarily oriented towards speeding up my Markdown workflow. Thanks to input and directions from Ole, I’ve put together a collection of scripts that allow me to get from raw Markdown text to final HTML (with images) ready for publishing in just a matter of seconds, rather than several minutes. I’ve also created scripts that rely on URL schemes to make the iOS apps I use communicate better, automatically.
Markdown to Poster
My most-used script is actually just a combination of simple Python and x-callback-url. It sends the contents of the clipboard to Notesy, which renders the Markdown and passes it to Poster – an app I use to publish posts on MacStories – as HTML. It takes less than 3 seconds to complete and return a new HTML post in Poster.
import webbrowser import urllib import clipboard base = 'notesy://x-callback-url/render-markdown?text=' url = clipboard.get() text = url.encode('utf-8') text = urllib.quote(text, safe='') poster = urllib.quote("posterapp://x-callback-url/create?text=", safe='') actions = '&output-param=text&x-success=' + poster + '&x-error=pythonista://' webbrowser.open(base + text + actions)
Not nearly as adopted as it should be, x-callback-url is a standardized protocol for iOS inter-app communication that enhances URL schemes with parameters apps can send/receive to trigger specific actions. In the words of Greg Pierce, its developer:
The goal of the x-callback-url specification is to provide a standardized means for iOS developers to expose and document the methods they make available to other apps. Using x-callback-url’s source apps can launch other apps passing data and context information, and also provide parameters instructing the target app to return data and control back to the source app after executing an action.
In the protocol’s draft specification, Greg details the structure of x-callback-url and how developers can easily take advantage of it by supporting parameters for source and target apps.
My script does indeed take advantage of the
x-success parameter provided by x-callback-url. Most iOS apps that use URL schemes have implemented them in a one-way communication method: launch this URL to open this app. Developers who have spent time structuring their URL schemes often come up with richer actions: launch this URL to open this app in a specific view. Developers who rely on x-callback-url and respect the specification can get access to extra parameters such as source, success, error, and cancel. These enable powerful if/then clauses in URL schemes: if the action in the target app fails, go back to source app.
I write and edit in Nebulous, but I publish articles using Poster. As I was researching options to automate my workflow, I stumbled across the Notesy URL scheme. It seemed too good to be true: it supports x-callback-url and comes with an action to render Markdown and pass it to another app or the system clipboard. Essentially, given properly encoded text, Notesy can act as a “bridge” between apps to render Markdown to HTML – without forcing you to tap any buttons.
Why Notesy instead of the built-in Markdown module, though? First, Notesy uses the Sundown Markdown library, the same implemented by the best Markdown editors for iOS. More importantly, Notesy can run SmartyPants upon generating Markdown, which I find particularly useful for my frequent use of en dash on MacStories. Last, Notesy is really fast at rendering Markdown and I like to support an app that properly and cleverly utilizes x-callback-url.
The script itself is very straightforward:
base is the Notesy URL scheme we’ll use to send text;
url gets the text from the clipboard, encodes it in UTF–8 and replaces special characters using percent-encoding with
The second part of the script prepares the URL that Notesy will open if it succeeds in rendering Markdown. We’re telling Notesy: if you successfully render Markdown, then open Poster with the HTML as article text. There are two things to keep in mind here: to pass along text with
render-markdown in Notesy, use
output-param. As you can see, I’m using
text to encode text and send it as the result of Notesy’s rendering. Second, when an app launched via URL scheme (such as Notesy) has to open another URL scheme (in our case, Poster’s one), always percent-encode the second URL.
In the last line, the
webbrowser module of Pythonista simply launches the complete URL and executes the set of actions described above. The nice thing about
webbrowser is that it’ll open standard http:// links within Pythonista, but it can be used to launch other URL schemes without any confirmation dialog.
To show how, in practice, the script takes seconds to complete, I’ve made a video.
If, for some reason, I don’t want to convert Markdown using Notesy, I can rely on Python-Markdown to do the conversion for me. Available in Pythonista 1.2, Python-Markdown expects and returns Unicode input.
import markdown import clipboard input_file = clipboard.get() s = input_file md = markdown.Markdown() html = md.convert(s) print html clipboard.set(html)
The script simply expects Markdown text to be in the clipboard, converts it to HTML using Python-Markdown, and sets the clipboard to the newly generated HTML. I find it useful for quick Markdown to HTML conversions.
Markdown to Byword
I’ve already explained why I believe Byword has the best MultiMarkdown previews on iOS. In spite of the lack of true MultiMarkdown converting in Pythonista, I’ve still put together a modified version of the script above to open the preview in Byword via the app’s URL scheme.
import webbrowser import markdown import clipboard import urllib input_file = clipboard.get() s = input_file md = markdown.Markdown() html = md.convert(s) clipboard.set(html) s = clipboard.get() s = urllib.quote(s.encode('utf-8')) webbrowser.open('byword://new?text=' + s)
I hope Metaclassy will consider adding a more powerful URL scheme to Byword.
Thanks to Ole, I’m using a simple adaptation of Seth Brown’s formd Markdown formatting tool to flip the style of Markdown links from inline to reference and viceversa. As Seth explains, “inline Markdown is difficult to read, but useful for writing and editing because the linked text and URLs are adjacent to the words you are writing”. I like to write with inline links, but I prefer to archive my articles as reference-style Markdown files.
#!/usr/bin/env python # encoding=utf8 """ Seth Brown 02-24-12 """ from sys import stdin, stdout import re from collections import OrderedDict class ForMd(object): """Format mardown text""" def __init__(self, text): super(ForMd, self).__init__() self.text = text self.match_links = re.compile(r'(\[[^^]*?\])\s?(\[.*?\]|\(.*?\))', re.DOTALL | re.MULTILINE) self.match_refs = re.compile(r'(?
The text output is set back to the clipboard so I can pass it to another script or paste it in my editor of choice. In the future, I’d love to see Nebulous Notes being capable of launching URL schemes if only to trigger my Pythonista scripts directly from the app.
This is one of the Pythonista scripts I use the most: when I was beta-testing Pythonista 1.2 and Ole added support for images, I knew this would become the script that would allow me not to require a Mac for image processing anymore.
import clipboard import Image import console im1 = clipboard.get_image(idx=0) im2 = clipboard.get_image(idx=1) background = Image.new('RGBA', (746,650), (255, 255, 255, 255)) def main(): console.clear() print "Generating image..." console.show_activity() _1 = im1.resize((366,650),Image.ANTIALIAS) _2 = im2.resize((366,650),Image.ANTIALIAS) background.paste(_1,(0,0)) background.paste(_2,(380,0)) background.show() console.hide_activity() clipboard.set_image(background, format='jpeg', jpeg_quality=0.80) print "\n\n Image set to clipboard" console.clear() print "Create now or Control? \n" print " Create" print " Control \n" set_mode = raw_input("Select a mode: ") if set_mode == "x": print "Exited" elif set_mode == "1": if __name__ == '__main__': main() elif set_mode == "2": print "\n\n" print "Which image goes on the left? (in Photos.app order) \n" print " The first image" print " The second image \n" set_im = raw_input("Select an image: ") if set_im == "x": print "Exited" else: print "\n\n" if set_im == "1": if __name__ == '__main__': main() elif set_im == "2": console.clear() print "Generating image..." console.show_activity() _1 = im1.resize((366,650),Image.ANTIALIAS) _2 = im2.resize((366,650),Image.ANTIALIAS) background.paste(_1,(380,0)) background.paste(_2,(0,0)) background.show() console.hide_activity() clipboard.set_image((background), format='jpeg', jpeg_quality=0.80) print "\n\n Image set to clipboard"
Essentially, it is a Python version of my Keyboard Maestro macro for iPhone screenshots. Given two iPhone 5 screenshots, it creates a single composited image showing both screenshots side by side. Using text output in the console it enables me to control the placement of the screenshots: I can specify whether I want the first or second screenshot to be on the left side of the final image.
Line 6/7 grabs images from the iOS clipboard using
get_image command is interesting for two reasons: first, as part of the
clipboard module, it is able to read directly from the iOS clipboard – i.e. items you have copied using iOS’ standard “Copy” menu. Second, Ole structured it so that it returns a PIL image from an image in the clipboard. If you copy multiple images at once, you can use the
idx parameter to get an image at a given index.
idx works, and how I use it. To compose the screenshot, I need two images in the clipboard at once. To do so, I can copy multiple images from the Photos app: from either Camera Roll or Photo Stream, Edit > Select photos > Share > Copy, and you’ll have two images in the clipboard. The important thing to understand with
idx and the Photos app is that Pythonista will grab images in “Photos app order” starting at 0.
So, for instance, here’s how
idx would get the images shown below:
I don’t always need to, but there are times when I want to control how the screenshots are displayed on the final image – i.e. the second screenshot in Photos-order should actually be pasted first onto the image. I could have probably created something more elegant or simpler, but, in short, here’s how I did it: I defined a
main function that pastes the first screenshot (idx=0) to the left side of the final image (coordinates 0,0). The function takes care of clearing the console, printing status messages, showing a spinner in the iOS status bar (it’s not network activity, but I like the visual hint), and doing the image processing; the final image is shown and also set to the clipboard. Through a series of text inputs, the script asks me if I want to create an image with default placement, or, if I want to control it myself. If I choose option 2 (control), it asks me if I want the first or second image to be on the left. In case I want the second image, it uses inverted coordinates for pasting.
Allow me to explain some parts more in detail. Once collected from the clipboard and turned over to PIL, screenshots need to be resized to fit inside the 746x650 image I want as final result. To do so, my
main function uses
resize (line 15/16) at 366x650 with
ANTIALIAS, a high-quality downsampling filter provided by PIL. The process will be a little slower, but the image will be resized maintaining a higher quality.
Line 8 creates a 746x650 white background; the
main function pastes the screenshots onto the background, offsetting the second one by 14 pixels so to leave a white strip in the middle. Line 19 shows the final image in Pythonista’s console.
show() an image in the console, you can tap on it to Copy it or Save it, just like any other image on iOS. However, you can also set the image back to the clipboard automatically, so it’ll be ready for pasting in, say, a Mail message. Line 22 uses
jpeg_quality parameters to put the image as a JPEG saved at 80% of quality in the clipboard.
Once set up, you can create a Home screen shortcut for the script; select two iPhone screenshots from the clipboard, tap on the shortcut, and after a few seconds you’ll have a composited image ready in your clipboard.
This script has enabled me to a) save precious minutes, b) be faster and more efficient, and c) uninstall Photoshop Touch, which I was using solely to create this kind of screenshots. To manipulate iP