在Python中操作字典之setdefault()方法的使用

 setdefault()方法类似于get()方法，但会设置字典[键]=默认情况下，如果键不是已经在字典中。
方法

以下是setdefault()方法的语法：

dict.setdefault(key, default=None)

参数

• key -- 这是要被搜索的键
• default -- 这是没有找到键的情况下返回的值。

返回值

此方法返回字典可用的键值，如果给定键不可用，则它会返回所提供的默认值。
例子

下面的例子显示了setdefault()方法的使用。

#!/usr/bin/python

dict = {'Name': 'Zara', 'Age': 7}

print "Value : %s" % dict.setdefault('Age', None)
print "Value : %s" % dict.setdefault('Sex', None)

当我们运行上面的程序，它会产生以下结果：

Value : 7
Value : None

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