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

2. Cannot contain illegal characters

>>> ssd@f=1
  File "<stdin>", 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 "<stdin>", 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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