Python – Check if ke

发布时间:2019-08-30 08:33:10编辑:auto阅读(1723)

    In Python, you can use the in operator to check if a key exists in a dictionary.

    test.py

    def main():
        fruits = {
            'apple':1,
            'orange':2,
            'banana':3
        }
    
        #if key 'apple' exists in fruits?
        if 'apple' in fruits:
            print(fruits['apple'])
    
    if __name__ == '__main__':
        main()

    Output

    1

    P.S Tested with Python 3.4.3
    Note
    has_key() is deprecated in favor of key in d.

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