Common methods for operating dictionary types in Python-Python Tutorial-php.cn

Common methods for operating dictionary types in Python

高洛峰

Release： 2017-03-02 16:38:49

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The following editor will bring you a common method for operating dictionary types in Python (recommended). The editor thinks it's pretty good. Now I'll share it with you and give it as a reference. Let's follow the editor and take a look.

The has_key() method can check whether the dictionary contains the specified key. If so, then Return True, otherwise return False.

Grammar format:

dictionary_name.has_key(key) 

dict1 = {&#39;01&#39;:&#39;yangry&#39;,&#39;02&#39;:&#39;weild&#39;,&#39;03&#39;:&#39;hexh&#39;,&#39;04&#39;:&#39;huangmg&#39;}
print dict1.has_key(&#39;02&#39;)
print dict1.has_key(&#39;08&#39;) 

#result
True
False

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2.clear() method

Used to clear all items in the dictionary, no return value.

Usage:

dictionary_name.clear()

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3, copy method

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

dictionary_targetname = dictionary_sourcenme.copy()

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4,fromkeys() method

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

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

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5, update() method

Format:

update_dictionary.update(source_dictionary) 

mydict1 = {&#39;1&#39;:&#39;yy11&#39;,&#39;2&#39;:&#39;yy22&#39;,&#39;3&#39;:&#39;yy33&#39;}
newdict = {&#39;2&#39;:&#39;success&#39;} 

mydict1.update(newdict)
print mydict1 


#result
{&#39;1&#39;: &#39;yy11&#39;, &#39;3&#39;: &#39;yy33&#39;, &#39;2&#39;: &#39;success&#39;}

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