I need a way to call Python code from Swift on an Apple platform. A library would be ideal. I've done a considerable amount of Google searching, and the closest material I found is for Objective-C.
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1Apple doesn't allow apps to be written, in any part, in languages besides Obj-C and Swift. You're not likely to find any luck in this endeavour (and even if you find a hacky solution, it wouldn't be allowed on the App Store).Hayden Schiff– Hayden Schiff2015-08-10 19:33:15 +00:00Commented Aug 10, 2015 at 19:33
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1In the deleted answer (seriously, we're deleting answers now that contain a helpful link to an article?), there's a helpful link for OS X at least: practicalswift.com/2014/06/25/…John Goering– John Goering2015-08-11 06:29:18 +00:00Commented Aug 11, 2015 at 6:29
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@oxguy3 i don't think that' necessarily true. Checkout this doc from apple -developer.apple.com/library/ios/technotes/tn2328/_index.html-Shaun– Shaun2015-08-14 17:04:52 +00:00Commented Aug 14, 2015 at 17:04
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4 Answers
In swift 5 you can try PythonKit framework.
Here's example of the usage:
import PythonKit
let sys = try Python.import("sys")
print("Python \(sys.version_info.major).\(sys.version_info.minor)")
print("Python Version: \(sys.version)")
print("Python Encoding: \(sys.getdefaultencoding().upper())")
2 Comments
jbm
I've been trying to load a custom module with PythonKit but can't seem to do it. Do you have any idea how (or if) that's supposed to work? I'm able to use
os.chdir() and os.getcwd() to get to the directory where my module is installed, but it fails loading the actual module.jbm
I realized I can add a custom directory to PYTHONPATH using
sys.path.append(), but I still can't load my custom module. I can load it from the terminal, so the module should be fine.I found this excellent and up to date gist that walks you through a complete solution: https://github.com/ndevenish/Site-ndevenish/blob/master/_posts/2017-04-11-using-python-with-swift-3.markdown
If you can get away with just using NSTask to launch a Python process, that's a pretty good option too.
1 Comment
thavasidurai
Is there any way to use this in iOS project? It seems the given link described the steps to use it in macOS.
In Swift 4.2 there was an approved feature to allow dynamic languages to be ported directly into swift
https://github.com/apple/swift-evolution/blob/master/proposals/0195-dynamic-member-lookup.md
Will look similar to:
// import pickle
let pickle = Python.import("pickle")
// file = open(filename)
let file = Python.open(filename)
// blob = file.read()
let blob = file.read()
// result = pickle.loads(blob)
let result = pickle.loads(blob)
2 Comments
Serhii Palash
does it only works in Playground? 'cuz I really need it in the Xcode iOS project but it doesn't know what is Python..
Daniel R. Livingston
@SerhiiPalash Swift is Swift, whether used in Playground or compiled for a distributable binary.
If anyone is ever interested in calling python from swift, here is some helpful material I found:
- U the python framework - https://developer.apple.com/library/ios/technotes/tn2328/_index.html
- PyObjC (a little more challenging) -
- Cobbal - https://github.com/cobbal/python-for-iphone
- Python docs (you would need to make C-Swift bridge)
Most of it is for Objective-c, but if you need to use swift you can easily just create an ObjC-Swift bridge (super-super easy) - Lookup the apple docs
