Call function twice or more in a loop

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予麋鹿
予麋鹿 2021-01-15 13:55

I use the code below with lambda to call function once in a loop, it works but now I am trying to call the function for specific times like 3 times in a loop, I

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  • 2021-01-15 14:20

    You should work with a decorator, that makes it clear, what you intend to do:

    class call_three_times(object):
        def __init__(self, func):
            self.func = func
            self.count = 0
    
        def __call__(self, *args, **kw):
            self.count += 1
            if self.count <= 3:
                return self.func(*args, **kw)
    
    @call_three_times
    def func():
        print "Called only three times"
    
    func() # prints "Called only three times"
    func() # prints "Called only three times"
    func() # prints "Called only three times"
    func() # does nothing
    
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  • 2021-01-15 14:40

    Another approach is to use function instead of class:

    def call_three_times(func, *args, **kwargs):
        def wrapper(*args, **kwargs):
            wrapper.called += 1
            return func(*args, **kwargs) if wrapper.called <= 3 else None
        wrapper.called = 0
        return wrapper
    
    
    @call_three_times
    def func():
        print "Called only three times"
    
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