compare-to-empty-string / C1901

Message emitted:

"%s" can be simplified to "%s" as an empty string is falsey

Description:

Used when Pylint detects comparison to an empty string constant.

Problematic code:

x = ""
y = "hello"

if x == "":  # [compare-to-empty-string]
    print("x is an empty string")

if y != "":  # [compare-to-empty-string]
    print("y is not an empty string")

Correct code:

x = ""
y = "hello"

if not x:
    print("x is an empty string")

if y:
    print("y is not an empty string")

Configuration file:

[main]
load-plugins=pylint.extensions.emptystring

Note

This message is emitted by the optional 'compare-to-empty-string'

checker which requires the pylint.extensions.emptystring plugin to be loaded.

Created by the compare-to-empty-string checker.