NameError: global name '' is not defined

For the Python running console:
NameError: global name '' is not defined
How to solve it?

This operation error, the semantic meaning is: the global name is not defined

例如console台报错：
NameError: global name ‘time’ is not defined
NameError: global name ‘datetime’ is not defined

For such not defined nameerror, just import the package in the ''

import time
from datetime import datetime

This problem is solved