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学习Python过程中,发现没有switch-case,过去写C习惯用Switch/Case语句,官方文档说通过if-elif实现。所以不妨自己来实现Switch/Case功能。
使用if…elif…elif…else 实现switch/case
可以使用if…elif…elif..else序列来代替switch/case语句,这是大家最容易想到的办法。但是随着分支的增多和修改的频繁,这种代替方式并不很好调试和维护。
方法一
通过字典实现
def foo(var): return { 'a': 1, 'b': 2, 'c': 3, }.get(var,'error') #'error'为默认返回值,可自设置
方法二
通过匿名函数实现
def foo(var,x): return { 'a': lambda x: x+1, 'b': lambda x: x+2, 'c': lambda x: x+3, }[var](x)
方法三
通过定义类实现
参考Brian Beck通过类来实现Swich-case
# This class provides the functionality we want. You only need to look at # this if you want to know how this works. It only needs to be defined # once, no need to muck around with its internals. class switch(object): def __init__(self, value): self.value = value self.fall = False def __iter__(self): """Return the match method once, then stop""" yield self.match raise StopIteration def match(self, *args): """Indicate whether or not to enter a case suite""" if self.fall or not args: return True elif self.value in args: # changed for v1.5, see below self.fall = True return True else: return False # The following example is pretty much the exact use-case of a dictionary, # but is included for its simplicity. Note that you can include statements # in each suite. v = 'ten' for case in switch(v): if case('one'): print 1 break if case('two'): print 2 break if case('ten'): print 10 break if case('eleven'): print 11 break if case(): # default, could also just omit condition or 'if True' print "something else!" # No need to break here, it'll stop anyway # break is used here to look as much like the real thing as possible, but # elif is generally just as good and more concise. # Empty suites are considered syntax errors, so intentional fall-throughs # should contain 'pass' c = 'z' for case in switch(c): if case('a'): pass # only necessary if the rest of the suite is empty if case('b'): pass # ... if case('y'): pass if case('z'): print "c is lowercase!" break if case('A'): pass # ... if case('Z'): print "c is uppercase!" break if case(): # default print "I dunno what c was!" # As suggested by Pierre Quentel, you can even expand upon the # functionality of the classic 'case' statement by matching multiple # cases in a single shot. This greatly benefits operations such as the # uppercase/lowercase example above: import string c = 'A' for case in switch(c): if case(*string.lowercase): # note the * for unpacking as arguments print "c is lowercase!" break if case(*string.uppercase): print "c is uppercase!" break if case('!', '"c is a sentence terminator!" break if case(): # default print "I dunno what c was!" # Since Pierre's suggestion is backward-compatible with the original recipe, # I have made the necessary modification to allow for the above usage.
查看Python官方:PEP 3103-A Switch/Case Statement
发现其实实现Switch Case需要被判断的变量是可哈希的和可比较的,这与Python倡导的灵活性有冲突。在实现上,优化不好做,可能到最后最差的情况汇编出来跟If Else组是一样的。所以Python没有支持。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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