我不断收到元组错误，想知道它们是什么以及如何修复它们

Question

例如，当我在此函数中添加以下多个返回时，我正在为学校编写的代码给了我一个元组错误

def GetHowLongToRun():
  print('Welcome to the Plant Growing Simulation')
  print()
  print('You can step through the simulation a year at a time')
  print('or run the simulation for 0 to 5 years')
  print('How many years do you want the simulation to run?')
  Years = int(input('Enter a number of years to run, or -1 for stepping mode:'))
  skipyear = input("Would you like to pause every year? Y/N")
  skipseason = input("Would you like to pause every season? Y/N")
  return Years, skipyear, skipseason

这给了我以下错误

Traceback (most recent call last):
  File "C:\Users\jonwe\Downloads\Paper1_ASLv1_2017_Python3_Pre (1).py", line 170, in <module>
    Simulation()
  File "C:\Users\jonwe\Downloads\Paper1_ASLv1_2017_Python3_Pre (1).py", line 154, in Simulation
    if YearsToRun >= 1:
TypeError: '>=' not supported between instances of 'tuple' and 'int'

但如果我只返回“Years”字符串，它不会给我任何错误并且可以完美运行

Answer 1

我认为问题在于您如何处理/解压缩返回值。我不知道您目前拥有什么，但应该是：

YearsToRun, skipy, skips = GetHowLongToRun ()

将变量分配给函数的顺序应与返回值的顺序相同。

>>> YearsToRun, skipy, skips = GetHowLongToRun ()
Welcome to the Plant Growing Simulation

You can step through the simulation a year at a time
or run the simulation for 0 to 5 years
How many years do you want the simulation to run?
Enter a number of years to run, or -1 for stepping mode:2
Would you like to pause every year? Y/NN
Would you like to pause every season? Y/NN
>>> if YearsToRun >= 1:
...    print ('Do something.')
...    print ('Skip year: ', skipy)
...    print ('Skip season: ', skips)
... 
Do something.
Skip year:  N
Skip season:  N