30秒学会 Python 片段 – Check for duplicates in list

Checks if there are duplicate values in a flat list.

• Use set() on the given list to remove duplicates, compare its length with the length of the list.

代码实现

def has_duplicates(lst):
  return len(lst) != len(set(lst))

使用样例

x = [1, 2, 3, 4, 5, 5]
y = [1, 2, 3, 4, 5]
has_duplicates(x) # True
has_duplicates(y) # False

翻译自：https://www.30secondsofcode.org/python/s/has-duplicates