The "python-dictionary" determines whether a key exists in the Python dictionary

There are generally two common practices:

The first approach: using a self-implemented function:

There is a Has_key () method in the property method of the Python dictionary:

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1. #生成一个字典
2. D = {' name ': Tom, ' age ':ten, ' Tel ':
3. #打印返回值
4. Print D.has_key (' name ')
5. #结果返回True

The second method: Use the In method:

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1. #生成一个字典
2. D = {' name ': Tom, ' age ':ten, ' Tel ':
3. #打印返回值, where D.keys () is a list of all keys in the dictionary
4. print ' name ' in D.keys ()
5. Print ' name ' in D
6. #两个的结果都是返回True

In addition to using in, you can determine that the key does not exist and use in is faster than Has_key.

The "python-dictionary" determines whether a key exists in the Python dictionary