零基础学python-8.7 字典常用方法

标签：python

1.列举字典的值、键与对

>>> d={'a':1,'b':2,'c':3,'d':4}
>>> list(d.keys ())
['c', 'd', 'a', 'b']
>>> list(d.values ())
[3, 4, 1, 2]
>>> list(d.items ())
[('c', 3), ('d', 4), ('a', 1), ('b', 2)]
>>> 

>>> d={'a':1,'b':2,'c':3,'d':4}
>>> d.get ('a')
1
>>> 

>>> d={'a':1,'b':2,'c':3,'d':4}
>>> e={'e':5}
>>> d+e
Traceback (most recent call last):
  File "<pyshell#30>", line 1, in <module>
    d+e
TypeError: unsupported operand type(s) for +: 'dict' and 'dict'
>>> d.update (e)
>>> d
{'c': 3, 'e': 5, 'd': 4, 'a': 1, 'b': 2}
>>> 

>>> d={'a':1,'b':2,'c':3,'d':4}
>>> d.pop ('a')
1
>>> d
{'c': 3, 'd': 4, 'b': 2}
>>> del d['b']
>>> d
{'c': 3, 'd': 4}
>>> 

就说到这里，谢谢大家

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零基础学python-8.7 字典常用方法

标签：python

原文地址：http://blog.csdn.net/raylee2007/article/details/48064977