在Python中操作字典之fromkeys()方法的使用
fromkeys()方法从序列键和值设置为value来创建一个新的字典。
语法
以下是fromkeys()方法的语法:
dict.fromkeys(seq[, value]))
参数
- seq -- 这是将用于字典的键准备的值的列表。
- value -- 这是可选的,如果提供的话则值将被设置为这个值
返回值
此方法返回列表。
例子
下面的例子显示fromkeys()方法的使用。
#!/usr/bin/python seq = ('name', 'age', 'sex') dict = dict.fromkeys(seq) print "New Dictionary : %s" % str(dict) dict = dict.fromkeys(seq, 10) print "New Dictionary : %s" % str(dict)
当我们运行上面的程序,它会产生以下结果:
New Dictionary : {'age': None, 'name': None, 'sex': None} New Dictionary : {'age': 10, 'name': 10, 'sex': 10}

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