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Python 删除列表中的元素
source link: https://www.lfhacks.com/tech/python-remove-all-occurrence
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Python 删除列表中的元素
首先，列表的 remove() 方法只能删除第一次出现的位置（first occurrence）
>>> x = [1, 2, 1, 2, 1, 2]
>>> x.remove(2)
>>> x
[1, 1, 2, 1, 2]
>>> 如果要全部删除list里面的某个元素，可以用列表解析方法（List comprehension）：
>>> x = [1, 2, 1, 2, 1, 2]
>>> y = [i for i in x if i != 2] #删除全部2
>>> y
[1, 1, 1]
>>>同样方法可以用来一次性删除多种元素：
>>> x = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> y = [i for i in x if i != 2 and i != 3] #删除全部2和3
>>> y
[1, 1, 1, 1]
>>> 删除一个范围：
>>> x = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> y = [i for i in x if i < 2] #只保留小于2的
>>> y
[1, 1, 1, 1]
>>> 甚至删除一个集合里的元素：
>>> x = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> d = [2, 3]
>>> y = [i for i in x if i not in d] #不保留d中的元素
>>> y
[1, 1, 1, 1]
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