Common methods for operating dictionary types in python

The following small series will provide you with a common method to operate the dictionary type in python (recommended ). I think this is quite good. I will share it with you and give you a reference, let's take a look at the following small series to bring you a common method for using python to operate the dictionary type (recommended ). I think it's quite good. now I will share it with you and give you a reference. let's take a look at it together.

The has_key () method can check whether the dictionary contains the specified key. If yes, True is returned. otherwise, False is returned.

Syntax format:

dictionary_name.has_key(key) dict1 = {'01':'yangry','02':'weild','03':'hexh','04':'huangmg'}print dict1.has_key('02')print dict1.has_key('08') #resultTrueFalse

2. clear () method

Used to clear all the items in the dictionary without returning values.

Usage:

dictionary_name.clear()

3. copy method

The copy () method returns a new dictionary with the same key-value pairs in the following format:

dictionary_targetname = dictionary_sourcenme.copy()

4, fromkeys () method

Use the given key to create a new dictionary. the value corresponding to each key value is None.

dictionary_name.fromkeys([key1,key2,...],(default_value))

5. update () method

Format:

update_dictionary.update(source_dictionary) mydict1 = {'1':'yy11','2':'yy22','3':'yy33'}newdict = {'2':'success'} mydict1.update(newdict)print mydict1 #result{'1': 'yy11', '3': 'yy33', '2': 'success'}

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