Python没有switch语句，只能通过模拟来对应实现：方法一：使用dictionary
**values = {
value1: do_some_stuff1,
value2: do_some_stuff2,
...
valueN: do_some_stuffN,
}
values.get(var, do_default_stuff)()根据需求可以自行更改参数内容，灵活运用def add(x,y):print x+y def minus(x,y):print x-y def multiply(x,y):print x*y def div(x,y):print x/y def fun_case_list(key,arg1,arg2):operator = {'+':add,'-':minus,'*':multiply,'/':div}if operator.has_key(key):return operator.get(key)(arg1,arg2) else:return 'No [%s] case in dic'%key #or do other func if __name__ == "__main__":fun_case_list('*',3,5) fun_case_list('l',3,4)或者你可以自己造一个类来实现:class switch_case(object):def case_to_function(self,case,arg1,arg2):func_name = 'case_func_'+str(case) try:method = getattr(self,func_name) return method(arg1,arg2) except AttributeError:return 'No func found in case list,do default action here'def case_func_add(self,arg1,arg2):temp = arg1 + arg2 return temp def case_func_minus(self,arg1,arg2):temp = arg1 - arg2 return temp def case_func_multiply(self,arg1,arg2):temp = arg1 * arg2 return temp def case_func_div(self,arg1,arg2):temp = arg1 / arg2 return temp func = 'minus'case = switch_case() print case.case_to_function(func,2,5)
#或者是构造属性去送参数,看个人喜好class switch_case(object):def __init__(self, case, arg1, arg2):self.case = str(case) self.arg1 = arg1 self.arg2 = arg2 def case_to_function(self):func_name = 'case_func_'+str(self.case) try:method = getattr(self,func_name) return method() except AttributeError:return 'No func found in case list,do default action here'
def case_func_add(self):temp = self.arg1 + self.arg2 return temp def case_func_minus(self):temp = self.arg1 - self.arg2 return temp def case_func_multiply(self):temp = self.arg1 * self.arg2 return temp def case_func_div(self):temp = self.arg1 / self.arg2 return temp
func = 'minxus'case = switch_case(func,2,5) print case.case_to_function()方法二：使用lambda result = {
'a': lambda x: x * 5,
'b': lambda x: x + 7,
'c': lambda x: x - 2
}[value](x)方法三：Brian Beck提供了一个类 switch 来实现switch的功能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
v = 'two'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脚本之家。
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