學習Python過程中，發現沒有switch-case,過去寫C習慣用Switch/Case語句，官方文檔說通過if-elif實現。所以不妨自己來實現Switch/Case功能。
使用if…elif…elif…else 實現switch/case
可以使用if…elif…elif..else序列來代替switch/case語句，這是大家最容易想到的辦法。但是隨著分支的增多和修改的頻繁，這種代替方式并不很好調試和維護。
方法一
通過字典實現
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def foo(var): return { 'a': 1， 'b': 2, 'c': 3, }.get(var,'error') #'error'為默認返回值，可自設置 |
方法二
通過匿名函數實現
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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
通過定義類實現
參考Brian Beck通過類來實現Swich-case
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# 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 stringc = '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('!', '?', '.'): # normal argument passing style also applies print "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
發現其實實現Switch Case需要被判斷的變量是可哈希的和可比較的，這與Python倡導的靈活性有沖突。在實現上，優化不好做，可能到最后最差的情況匯編出來跟If Else組是一樣的。所以Python沒有支持。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/gerrydeng/p/7191927.html
