#pytricks

# Python program to demonstrate list comprehension in Python # below list contains square of all odd numbers from # range 1 to 10 odd_square = [x ** 2 for x in range(1, 11) if x % 2 == 1] print odd_square

>>> import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better

""" True and False are keywords in python3, but not in Python2. In Python2 the value of True is 1, and the value of False is 0. True and False can be regarded as vars and thus they are slow

# Why Python is Great: Namedtuples # Using namedtuple is way shorter than # defining a class manually: >>> from collections import namedtuple >>> Car = namedtuple('Car', 'color mileage')

# The get() method on dicts # and its "default" argument name_for_userid = { 382: "Alice", 590: "Bob", 951: "Dilbert", } def greeting(userid): return "Hi %s!"

"""True and False can be used as integer values True -> 1 False -> 0 """ a = 5 print(isinstance(a, int) + (a <= 10)) print(["is odd", "is even"][a

# @classmethod vs @staticmethod vs "plain" methods # What's the difference? class MyClass: def method(self): """ Instance methods need a class instance and can access the instance

# How to sort a Python dict by value # (== get a representation sorted by value) >>> xs = {'a': 4, 'b': 3, 'c': 2, 'd': 1} >>> sorted(xs.items(), key=lambda x: x[1]) [('d', 1), ('c',

# Different ways to test multiple # flags at once in Python x, y, z = 0, 1, 0 if x == 1 or y == 1 or z == 1: print('passed') if 1 in (x, y, z): print('passed') These only test for truthiness: if x or y