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  1. #原始列表
  2. nums=[5,12,7,9,21,7,14]
  3. #统计数字7出现的次数
  4. count_seven=nums.count(7)
  5. print("数字7出现的次数:",count_seven)
  6. #判断99是否存在，不存在则添加
  7. if 99 not in nums:
  8.     nums.append(99)
  9. print("添加99后的列表:",nums)
  10.  
Success #stdin #stdout 0.07s 14080KB
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Standard input is empty
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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/44ky51
language:
Python 3 (python  3.12)
created:
19 hours ago
visibility:
public

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