Variable name of Python

Time:2020-2-22

In Python, variables do not need to be declared in advance. When they are created, they can be assigned directly. The variable type is determined by the value assigned to the variable. It is worth noting that once a variable is created, it needs to be assigned a value.

The following rules shall be strictly followed for variable names:

1. Variable name can only contain letters / numbers / underscores

2. Number cannot start

3. Can’t say the keyword of Python

4. It cannot be a function name, otherwise it will lose its function.

#!/use/bin/env python
#-*- coding:utf-8 -*-
Content5 = 6 ා Content5 is the value of variable name 6
Print (type (Content5)) (output type is' Int '
_Value = 'name of variable' × value is variable name 'name of variable' is value of variable
Print (type (﹐ value)) ﹐ output type is' STR '

How to view Python keywords?

import keyword
Print (keyword. IsKeyword ("and")) (judge whether and is a keyword
#Output true after running
Print (keyword. Kwlist) - view all keywords in Python

It cannot be a function name, otherwise it will lose its function function.

Len = 'special character channeling name' ා use len as variable name
print(len)
Print (len (strexample)) (len function loses the function of returning string length, resulting in system error.

Output is:
Special character names
Traceback (most recent call last):
  File "D:/pystudy/aaaa.py", line 15, in 
    print(len(strExample))
NameError: name 'strExample' is not defined