Renaming the keys of a dictionary [duplicate]

Answer 1

dict keys are immutable. That means that they cannot be changed. You can read more from the docs

dictionaries are indexed by keys, which can be any immutable type

Here is a workaround using dict.pop

>>> d = {1:'a',2:'b'}
>>> d[3] = d.pop(1)
>>> d
{2: 'b', 3: 'a'}