alist = [1, 2, 3]if alist:    print('list is empty')    astr = ''if astr:    print('string is empty')       anone = Noneif anone:    print('have a None')     abool = Falseif abool: # not abool == False    print('have a False, ') 

alist = [1, 2, 3]anohter_list = [4, 2, 3]for i in range(len(alist)):   print(alist[i], another_list[i])

alist = [1, 2, 3]anohter_list = [4, 2, 3]for index, value in enumerate(alist):    print(index, value, anohter_list[index])

configuration = {}log_severity = configuration.get('severity', 'Info')log_severity # Info

some_other_list = range(10)some_list = [element + 5 for element in some_other_list if element%2 == 0]some_list# [5, 7, 9, 11, 13]

result_list = ['True', 'False', 'File not found']'|'.join(result_list)# True|False|File not found

some_list = ['a', 'b', 'c', 'd', 'e'](first, second, *rest, _) = some_listprint(first) # aprint(rest) # ['c', 'd']

##不推荐found = Falsefor item in a_list:  if condition(item):    found = True    breakif found:  # do something if found...  ##推荐if any(condition(item) for item in a_list):  # do something if found...

# baddef normal_iter():    ret = []    for i in range(10):        ret.append(i**2)    return ret# gooddef generator():    for i in range(10):        yield i**2

class Point():    def __init__(self, x, y):        self.x = x        self.y = y    def __str__(self):        return '{0}, {1}'.format(self.x, self.y)p = Point(1, 2)print (p)