Swiftpy: embedding Python in Swift

Swiftpy: embedding Python in Swift
https://github.com/johnlinvc/swiftpy
Pycon Taiwan 2016 Lightning Talk

Transcript

1. Swiftpy : Embedding Python in Swift John Lin @johnlinvc
2. John Lin • @johnlinvc • Developer at iCHEF • Organizer of Swift.Taipei meetup
3. Swift • New Open Source programming language backed by Apple® • Created by Chris Lattner, main author of LLVM • Now supports Linux!
5. Swift Python Pandas scipy pylearn2 numpy
6. Swift Python
7. Swift Python Swiftpy
8. Swiftpy • http://github.com/johnlinvc/swiftpy • Evaluating Python code in Swift • Calling Python function in Swift • Conversion between Python object & Swift object
10. Hello World import Swiftpy initPython() evalStatement("print 'hello world'")
11. Hello World import Swiftpy initPython() evalStatement("print 'hello world'") λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo hello world
12. Calling Python Function let hello:PythonString = "hello function" let upperHello = hello.call("upper") print(upperHello)
13. Calling Python Function let hello:PythonString = "hello function" let upperHello = hello.call("upper") print(upperHello) λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo HELLO FUCTION
14. Define Python Function let defLeftPad = "def leftPad(str,len,fillchar):\n" + " return str.rjust(len,fillchar)" evalStatement(defLeftPad)
15. Calling LeftPad let leftPadStr:PythonString = "leftPad" let n:PythonInt = 10 let fillChar:PythonString = "j" let leftPadded = call("leftPad",args: leftPadStr, n, fillChar) print(leftPadded)
16. Calling LeftPad let leftPadStr:PythonString = "leftPad" let n:PythonInt = 10 let fillChar:PythonString = "j" let leftPadded = call("leftPad",args: leftPadStr, n, fillChar) print(leftPadded) λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo jjjleftPad
17. eval (expression only) let evalStr = eval("\"look! EVIL\"") print(evalStr) let addStr = eval("1 + 1") print(addStr)
18. eval (expression only) let evalStr = eval("\"look! EVIL\"") print(evalStr) let addStr = eval("1 + 1") print(addStr) λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo look! EVIL 2
19. Define Class let defFoo = "class Foo:\n" + " def __init__(self):\n" + " self.bar = 'i am an ivar'" evalStatement(defFoo)
20. Getting Attribute let foo = eval("Foo()") let bar = foo.attr("bar") print(bar)
21. Getting Attribute let foo = eval("Foo()") let bar = foo.attr("bar") print(bar) λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo i am an ivar
22. Setting Attribute let newBarVal:PythonString = "i'm the new bar" foo.setAttr("bar", value:newBarVal) let newBar = foo.attr("bar") print(newBar)
23. Setting Attribute let newBarVal:PythonString = "i'm the new bar" foo.setAttr("bar", value:newBarVal) let newBar = foo.attr("bar") print(newBar) λ ~/swiftpy_demo/ master .build/debug/swiftpy_demo i am an ivar i'm the new bar
25. Use Pandas evalStatement("import pandas as pd") let pyConDates = eval("pd.date_range('20130101', periods=6)") print(pyConDates)
26. λ ~//swiftpy_demo/ pandas_demo .build/debug/pandas_demo Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named pandas fatal error: unexpectedly found nil while unwrapping an Optional value Current stack trace: 0 libswiftCore.dylib 0x000000010863ab20 swift_reportError + 125 … 20 libdyld.dylib 0x00007fff913205ac start + 1 [1] 68673 illegal hardware instruction .build/ debug/pandas_demo
28. λ ~/Projs/2016/pyconftw/swiftpy_demo/ pandas_demo .build/debug/pandas_demo Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named pandas fatal error: unexpectedly found nil while unwrapping an Optional value Current stack trace: 0 libswiftCore.dylib 0x000000010863ab20 swift_reportError + 125 … 20 libdyld.dylib 0x00007fff913205ac start + 1 [1] 68673 illegal hardware instruction .build/ debug/pandas_demo
29. Future • Fix import error!! • Better conversion between Swift object & Python object • Support more python types • Calling Swift from Python
30. Swiftpy • http://github.com/johnlinvc/swiftpy • Try & Star!
31. Swift.Taipei meetup • http://swift.taipei • Every 3 weeks at iCHEF office. • Next is 6/14 • FREE! Beer and Food
33. We’re hiring! • We definitely need a DevOps professional. • We also need Python developers. • yuting.lin@ichef.com.tw