发布时间: 2023-10-05 00:37:00
refer to: https://flexiple.com/python/check-if-key-exists-in-dictionary-python
基本跟ruby 一样
a = {'one': 1, 'two': 2}
a['one'] # => 1
a.get('not-exist-key') # => None
a['not-exist-key'] # => 报错
把一个list转换为uniq list:
a = "123"
set(list(a))
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