nums = [5, 12, 7, 9, 21, 7, 14]
#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.remove(7)
print("删除列表中第一次出现的数字7:",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]
#打印添加后的新列表。
print("取出列表中第 2 个到第 4 个元素:",sub_list)
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