What are the legal identifier requirements for python

Python legal identifier requirements are: 1. It cannot start with a number; 2. It cannot contain illegal characters; 3. Numbers cannot be used as identifiers; 4. It cannot contain spaces; 5. It cannot contain operators.

1. Cannot start with a number

>>> 2bin=2 File "", line 1 2bin=2 ^ SyntaxError: invalid syntax

2. Cannot contain illegal characters

>>> ssd@f=1 File "", line 1 ssd@f=1 ^ SyntaxError: invalid syntax

3. Numbers cannot be used as identifiers Symbol

>>> 123='wdsa' SyntaxError: can't assign to literal

4. Cannot contain spaces

>>> fds fds=1 File "", line 1 fds fds=1 ^ SyntaxError: invalid syntax

5. Cannot contain operators

>>> sdf+sdf=1 SyntaxError: can't assign to operator 6.python保留关键字不能作为标识符

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