[英]Dictionary Comprehension from dictionary
I´m “testing” the Dictionaries Comprehensions using a dictionary to generate other. 我正在使用字典“测试” 字典理解来生成其他字典。
So, I want to conserve the “keys” of the first one and multiply the values *2. 所以,我想保留第一个的“键”并乘以值* 2。 And yes… I want to do it with comprehension to understand. 是的......我想通过理解来理解。
I want to reach: {4:2, 7:4, 8:6, 9:8} 我想达到: {4:2,7:4,8:6,9:8}
I am trying this: 我在尝试这个:
dic1 = {4:1, 7:2, 8:3, 9:4}
dictComp= {key:value for key in dic1.keys() for value in dic1.values() * 2}
print(dictComp)
ERROR: 错误:
Traceback (most recent call last):
File "C:\Python\file.py", line 13, in <module>
dictComp= {key:value for key in dic1.keys() for value in dic1.values() * 2}
File "C:\Python\file.py", line 13, in <dictcomp>
dictComp= {key:value for key in dic1.keys() for value in dic1.values() * 2}
TypeError: unsupported operand type(s) for *: 'dict_values' and 'int'
Anyone can help me? 有人可以帮帮我吗? Thanks a lot! 非常感谢!
Use dictionary comprehension like this: 使用这样的字典理解:
In [2]: dic1 = {4:1, 7:2, 8:3, 9:4}
In [3]: new_dict = {k: v * 2 for k, v in dic1.iteritems()} # dic1.items() for Python 3
In [4]: new_dict
Out[4]: {4: 2, 7: 4, 8: 6, 9: 8}
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