TypeError argument of type NoneType is not iterable

Question

I am making a Hangman game in Python  In the game  one python file has a function that selects a random string from an array and stores it in a variable  That variable is then passed to a function in another file  That function stores a users guess as a string in a variable  then checks to see if that guess is in the word  However  whenever I type a letter and press enter  I get the error in the title of this question  Just so you know  I m using Python 2 7  Here s the code for the function that takes a word   import random  easyWords     car    dog    apple    door    drum    mediumWords     airplane    monkey    bananana    window    guitar    hardWords     motorcycle    chuckwalla    strawberry    insulation    didgeridoo    wordCount        is called if the player chooses an easy game    The words in the array it chooses are the shortest   the following three functions are the ones that  choose the word randomly from their respective arrays  def pickEasy        word   random choice easyWords      word   str word      for i in range 1  len word    1           wordCount append        is called when the player chooses a medium game  def pickMedium        word   random choice mediumWords      for i in range 1  len word    1           wordCount append        is called when the player chooses a hard game   def pickHard        word   random choice hardWords      for i in range 1  len word    1           wordCount append        Now here is the code that takes the users guess and determines whether or not it is in the word chosen for the game  Pay no attention to the wordCount variable  Also   words  is the name of the file with the code above      from words import   from art import    def gamePlay difficulty       if difficulty    1          word   pickEasy           print start         print wordCount         getInput word       elif difficulty    2          word   pickMedium           print start         print wordCount      elif difficulty    3          word   pickHard           print start         print wordCount  def getInput wordInput       wrong   0     guess   raw input  Type a letter to see if it is in the word   n   lower        if guess in wordInput          print  letter is in word       else          print  letter is not in word    So far I have tried converting the  guess  variable in the gamePlay function to a string with str    I ve tried making it lowercase with  lower    and I ve done similar things in the words file  Here is the full error I get when I run this   File  main py   line 42  in  lt module gt      main     File  main py   line 32  in main     diff     File  main py   line 17  in diff     gamePlay difficulty    File   Users Nathan Desktop Hangman gameplay py   line 9  in gamePlay     getInput word    File   Users Nathan Desktop Hangman gameplay py   line 25  in getInput     if guess in wordInput    The  main py  you see is another python file I wrote  If you would like to see the others let me know  However  I feel the ones I ve shown are the only important ones  Thank you for your time  Let me know if I left out any important details

User · Answer

The python error says that wordInput is not an iterable -  it is of NoneType   If you print wordInput before the offending line  you will see that wordInput is None   Since wordInput is None  that means that the argument passed to the function is also None  In this case word  You assign the result of pickEasy to word   The problem is that your pickEasy function does not return anything  In Python  a method that didn t return anything returns a NoneType   I think you wanted to return a word  so this will suffice   def pickEasy        word   random choice easyWords      word   str word      for i in range 1  len word    1           wordCount append          return word

User · Answer

If a function does not return anything  e g    def test        pass   it has an implicit return value of None   Thus  as your pick  methods do not return anything  e g    def pickEasy        word   random choice easyWords      word   str word      for i in range 1  len word    1           wordCount append        the lines that call them  e g    word   pickEasy     set word to None  so wordInput in getInput is None  This means that   if guess in wordInput    is the equivalent of   if guess in None    and None is an instance of NoneType which does not provide iterator iteration functionality  so you get that type error   The fix is to add the return type   def pickEasy        word   random choice easyWords      word   str word      for i in range 1  len word    1           wordCount append          return word

[python] TypeError: argument of type 'NoneType' is not iterable

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