Python-intro-2

Transcript

1. Intro to Python by Shuai Liu
2. agenda • History & Basics • Advanced & Be Pythonic • Awesome Python Frameworks
3. Advanced & Be Pythonic
4. Review • int & float & bool • string & list & tuple • dict • loop & branch • def methods
5. Something interesting…
6. def foo(a, b): """My niubility methods.""" return a + b """My niubility methods.""" >>> print foo.__doc__ >>> My niubility methods.
7. class Person(object): """My first class""" version = 1.0 def __init__(self, name): self.name = name print "__init__ called" def get_name(self): """Return the name""" return self.name
8. Pythonic
9. –Martijn Faassen, founder of the lxml (XML library for Python) “Pythonic is to use the Python constructs and datastructures with clean, readable idioms.”
10. enumerate l = [0, 1, 2, 3, 4] for i in range(len(l)): print i, l[i] for i, element in enumerate(l): print i, element
11. value exchange temp = foo foo = bar bar = temp foo, bar = bar, foo
12. string concatenating s = “hello” + “world” s = “”.join([“hello”, “world”])
13. λ
14. lambda def foo(x): return x ** 2 lambda x : x ** 2 >>> a = lambda x : x ** 2 >>> a(5) >>> 25
15. filter & map & reduce
16. >>> filter(function, iterable) >>> map(function, iterable) >>> reduce(function, iterable)
17. filter
18. map
19. reduce
21. List comprehensions
22. >>> a = map(lambda x : x ** 2, range(10)) >>> a = [ x ** 2 for x in range(10)] >>> a = filter(lambda x : x % 2, range(10)) >>> a = [x for x in range(10) if x % 2]
24. two more things…
25. PEP
26. Python Enhancement Proposals num title owner 1 PEP Purpose and Guidelines Warsaw, Hylton, Goodger, Coghlan 4 Deprecation of Standard Modules von Löwis 5 Guidelines for Language Evolution Prescod 8 Style Guide for Python Code GvR, Warsaw, Coghlan
27. pip
28. pip • A tool for installing and managing Python packages. • $ sudo pip install Requests
29. Resources
31. IDE ‘+’.join([ , ])
32. IDE
33. Summary • OO • lambda & three functions • list comprehensions • resources
34. Thanks