检查特定值是否包含在列表中

  1. # if - 检查特定值是否包含在列表中
  2. num1 = ['aa', 'bb', 'ccc']
  3. print('aa' in num1)
  5. print('cc' in num1)

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检查特定值是否不包含在列表中

  1. num1 = ['aa', 'bb', 'ccc']
  3. num_find = 'd'
  5. if num_find not in num1:
  6.     print(f'{num_find.title()}, not find!')

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if-elif-else

  1. #if-elif-else
  3. age = 12
  5. if age < 4 :
  6.     print("FREE!")
  7. elif age < 18 :
  8.     print("50%!")
  9. else:
  10.     print('FULL!')

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确定列表不是空的

  1. orders = ['apple', 'cola', 'hamberger']
  3. if orders:
  4.     for order in orders:
  5.         print(f'You ordered {order}.')
  6. else:
  7.     print("What you want?")
  9. orders = []
  11. if orders:
  12.     for order in orders:
  13.         print(f'You ordered {order}.')
  14. else:
  15.     print("What you want?")

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使用多个列表

  1. orders = ['apple','cola']
  2. requests = ['hamberger','apple']
  4. for request in requests:
  5.     if request in orders:
  6.         print(f"OK,{request} right now!")
  7.     else:
  8.         print(f"Sorry,we don't have {request}")

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