Common methods for operating dictionary types in Python

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

#result
True
False

2.clear() method

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

Usage:

dictionary_name.clear()

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()

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))

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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