在Python中“ from bar import foo”之后，“ [foo]”有什么特殊含义吗？ （也许特定于python2）

Question

In particular, I am looking at this code:

import sqlite3
from sqlite3 import IntegrityError
[IntegrityError]

and am wondering: Is there some special meaning to [IntegrityError] ?

IntegrityError is just a class defined in the sqlite3 package, and of course, my own interpretation is that [IntgrityError] would just be an expression that puts it in a list, yet there I have it in a piece of code that I am studying. Could it be a typo? or am I missing some magic syntactic-sugar interpretation?

Answer 1

from sqlite3 import IntegrityError可以确保系统上已安装from sqlite3 import IntegrityError DB-API 2.0（PEP-249）版本，并且后续行[IntegrityError]抑制了linter。