• 1. 误写
  • 1.1. 单元素的逗号
  • 1.2. 数组变成元组
• 2. in

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1. 误写

1.1. 单元素的逗号

>>> type((2))
<class 'int'>
>>> type((2,)) 
<class 'tuple'>
>>> type(('f')) 
<class 'str'>
>>> type(('f',)) 
<class 'tuple'>

1.2. 数组变成元组

# 这是个元组, 为什么, 因为在']'后加了个逗号
plugins = [
    "vuepress-plugin-helper-live2d",
    "vuepress-plugin-reading-progress",
    "vuepress-plugin-code-copy",
],

2. in

1 in (2,4), 2 in (2,4), 3 in (2,4), 4 in (2,4), 5 in (2,4)
# (False, True, False, True, False)