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python操作字典类型的常用方法(推荐)

Jun 10, 2016 pm 03:04 PM

has_key()方法可以检查字典中是否含有指定的键,如果有则返回True,否则就返回False。

语法格式:

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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

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2.clear()方法

用于清除字典中所有的项,无返回值。

使用方式:

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dictionary_name.clear()

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3,copy方法

copy()方法返回一个具有相同键值对的新字典,格式如下:

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dictionary_targetname = dictionary_sourcenme.copy()

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4,fromkeys()方法

使用给定的键来建立新的字典,每个键值对应的值为None。

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

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5,update()方法

格式:

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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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