如何从Python函数中返回列表

在 Python 中，可以轻松地从函数中返回一个列表。可以将列表直接作为返回值，通过 return 语句将其返回。

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1、问题背景

在编写一个游戏时，需要创建一个函数来返回一个列表变量，以便将其传递给另一个变量。但是，在运行程序时遇到了错误，提示“TypeError: ‘NoneType’ object is unsubscriptable”。

2、解决方案

问题的原因在于startNewGame函数没有正确地返回列表变量。在该函数中，在创建列表变量MFCreatePH后，并没有使用return语句将其返回，而是直接打印了“Your PotatoHead varibles have been successfully created!”。

为了解决这个问题，需要在MFCreatePH创建后使用return语句将其返回，如下所示：

MFCreatePH = [inputPHName, inputPHGender, inputPHColour, inputPHFavThing, inputPHFirstToy]
return MFCreatePH

这样，startNewGame函数就可以正确地返回列表变量，并且可以被其他函数使用。

以下是修改后的代码：

def startNewGame():while 1:# Introduction:print()print("""Hello,You will now be guided through the setup process.
There are 7 steps to this.
You can cancel setup at any time by typing 'cancelSetup'Thankyou""")# Step 1 (Name):print()print("""Step 1 of 7:Type in a name for your PotatoHead:""")inputPHName = raw_input('|Enter Name:|')if inputPHName == 'cancelSetup':sys.exit()# Step 2 (Gender):print()print("""Step 2 of 7:Choose the gender of your PotatoHead:input either 'm' or 'f'""")inputPHGender = raw_input('|Enter Gender:|')if inputPHGender == 'cancelSetup':sys.exit()# Step 3 (Colour):print()print("""Step 3 of 7:Choose the colour your PotatoHead will be:Only Red, Blue, Green and Yellow are currently supported""")inputPHColour = raw_input('|Enter Colour:|')if inputPHColour == 'cancelSetup':sys.exit()# Step 4 (Favourite Thing):print()print("""Step 4 of 7:Type your PotatoHead's favourite thing:""")inputPHFavThing = raw_input('|Enter Favourite Thing:|')if inputPHFavThing == 'cancelSetup':sys.exit()# Step 5 (First Toy):print()print("""Step 5 of 7:Choose a first toy for your PotatoHead:""")inputPHFirstToy = raw_input('|Enter First Toy:|')if inputPHFirstToy == 'cancelSetup':sys.exit()# Step 6 (Check stats):while 1:print()print("""Step 6 of 7:Check the following details to make sure that they are correct:""")print()print("""Name:\t\t\t""" + inputPHName + """
Gender:\t\t\t""" + inputPHGender + """
Colour:\t\t\t""" + inputPHColour + """
Favourite Thing:\t""" + inputPHFavThing + """
First Toy:\t\t""" + inputPHFirstToy + """
""")print()print("Enter 'y' or 'n'")inputMCheckStats = raw_input('|Is this information correct?|')if inputMCheckStats == 'cancelSetup':sys.exit()elif inputMCheckStats == 'y':breakelif inputMCheckStats == 'n':print("Re-enter info: ...")print()breakelse:"The value you entered was incorrect, please re-enter your choice"if inputMCheckStats == 'y':break# Step 7 (Define variables for the creation of the PotatoHead):MFCreatePH = []print()print("""Step 7 of 7:Your PotatoHead will now be created...Creating variables...""")MFCreatePH = [inputPHName, inputPHGender, inputPHColour, inputPHFavThing, inputPHFirstToy]time.sleep(1)print("inputPHName")print()time.sleep(1)print("inputPHFirstToy")print()return MFCreatePH