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nums=[5,12,7,9,21,7,14]
count_seven=nums.count(7)
print("数字7出现的次数：",count_seven)
if 99 not in nums:
	nums.append(99)
print("添加99后的列表：",nums)

Success #stdin #stdout 0.13s 14072KB

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Standard input is empty

stdout

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数字7出现的次数： 2
添加99后的列表： [5, 12, 7, 9, 21, 7, 14, 99]

https://ideone.com/wTrivs

language:

Python 3 (python 3.12)

created:

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public

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