Python笔记(十四)-Function

知识要点

yield向调用者发回一个结果对象

像生成器这样的函数可以通过`yield`语句来返回值，并挂起它们的状态以便稍后恢复状态。

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def <name>(arg1,arg2,arg3,...,argN):
	<statements>
	return <value>

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def func():...		# Create function object
func()					# Call object
func.attr = value 	# Attach attributes

def times(x,y):            # Create and assign function
    return x * y            # Body executed when called

>>> times(3,5)
15

def intersect(seq1,seq2):
    res = []
    for x in seq1:
        if x in seq2:
            res.append(x)
    return res

>>> s1 = "SPAM"
>>> s2 = "SCAM"
>>> intersect(s1,s2)
['S', 'A', 'M']
>>> [x for x in s1 if x in s2]
['S', 'A', 'M']

>>> x = intersect([1,2,3],(1,4))
>>> x
[1]