30秒学会 Python 片段 – is-empty.md

title: Collection is empty
type: snippet
tags: [list,dictionary,string]
author: chalarangelo
cover: salad-1
dateModified: 2023-01-12T05:00:00-04:00

Checks if the a value is an empty sequence or collection.

• Use not to test the truth value of the provided sequence or collection.

代码实现

def is_empty(val):
  return not val

使用样例

is_empty([]) # True
is_empty({}) # True
is_empty('') # True
is_empty(set()) # True
is_empty(range(0)) # True
is_empty([1, 2]) # False
is_empty({ 'a': 1, 'b': 2 }) # False
is_empty('text') # False
is_empty(set([1, 2])) # False
is_empty(range(2)) # False

翻译自：https://www.30secondsofcode.org/python/s/is-empty