#删除与切片
#删除列表中第一次出现的数字7(只删一个),打印删除一个7之后的原列表。
nums = [5, 12, 7, 9, 21, 7, 14]
nums.remove(7)
print("删除一个7之后的原列表:",nums)
#取出列表中第 2 个到第 4 个元素(共 3 个元素),组成一个新列表并打印
sub_list = nums[1:4]
print("取出列表中第 2 个到第 4 个元素(共 3 个元素):" ,sub_list)
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