在python中使用字典中的键获取值不起作用

Question

我在python中有一个字典，如下所示。

path_definition = {
       '00:00:00:00:00:01':'00:00:00:00:00:04',
       '00:00:00:00:00:02':'00:00:00:00:00:05',
       '00:00:00:00:00:03':'00:00:00:00:00:06',
};

如果我做

for key in path_definition.keys()
      print('value {}'.format(path_definition[key])

由于某种原因，它似乎不起作用。

Answer 1

您的for是错误的，请尝试以下操作：

for key in path_definition.keys():  #colon is missed
  print('value {}'.format(path_definition[key])) #a parenthesys is missed

Answer 2

path_definition = {
       '00:00:00:00:00:01':'00:00:00:00:00:04',
       '00:00:00:00:00:02':'00:00:00:00:00:05',
       '00:00:00:00:00:03':'00:00:00:00:00:06' #comma not required
} #Semicolon not required

for key in path_definition.keys(): #semicolon missing
      print('value {}'.format(path_definition[key])) #extra parentheses missing

Answer 3

由于您在问题中没有提到您看到的错误（如果有的话），我现在看到您的代码有两个问题：

1. for语句末尾缺少一个:
2. 在print语句的末尾缺少一个)

修复这些：

>>> for key in path_definition.keys():
...     print('value {}'.format(path_definition[key]))
...
value 00:00:00:00:00:06
value 00:00:00:00:00:05
value 00:00:00:00:00:04