Dictionary key cannot be numeric in "Python" json

Tag: color Pytho value pre encounters BSP log present in Str

Met with a very strange mistake. Write a dictionary that is stored in a JSON file. Then read to determine if there is a key. Surprisingly, the same key actually existed two times.

Cause: JSON converts the value key to Unicode

Conclusion: Dictionary key cannot be numeric when using JSON!

Reproduce the problem:

 >>> a = {}  >>> a[1] = 1>>> b = Json.dumps (a)  >>> c = Json.loads (b)  >>> a{ 1:1}  >>>  c{u   " 1   ": 1}  >>> c[1] = 1>> > c{u   " 1   ": 1, 1:1}  >>> D = Json.dumps (c)  >>> D  "  {"1": 1, "1": 1}   " 

Comparing A and C, we can see that the numeric key is converted to Unicode, and then it is used as a new key when it is written to the value type key.

Dictionary key cannot be numeric in "Python" json