python NoneType object is not iterable
Solution 1
I would guess that the problem is on the last line, is should be dedented (reduce the indentation by one level). In your current code, when the file is not found, the function will return None. And your NoneType error might occur on the code using the output of this function.
Try reduce the indentation of your return statement.
EDIT:
Seeing your traceback, this issue is confirmed to be the error, as it can't unpack None into game1 and board1
Solution 2
The indentation of the return statement
return g,b
makes it a part of the else in you function. If the file cannot be opened, you create a new game
g,b = creategame()
but never return it. So maybe the code that consumes the values returned by this function raises the error. You should de-indent (if there's such a word) the return statement to make it a part of the function code and not the else branch
Or maybe the creategame() returns None and your line g,b = creategame() raises the error.
For such questions posting (and analyzing) the traceback will help you debug the code faster.
Saume
Updated on June 04, 2022Comments
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Saume almost 2 years
This code runs fine when "filename" is a file that exists... when it doesn't, however... I keep getting the same error: TypeError: 'NoneType' object is not iterable (Errno 2)
Even though i never iterate on anything unless a file is opened at the very start of the function. I've looked over my code many times over and can not find where i would iterate on an object that is not iterable.
NB. I've also tried with "except IOError" and I get the same result.
The function takes only one argument, its the variable "filename"
Taceback:
Traceback (most recent call last): File "C:\Users\Saume\Workspace\Chess\src\Main.py", line 431, in <module> game1, board1 = loadgame(inp_f) TypeError: 'NoneType' object is not iterableNB. the call to the function is done with a string that is collected from user input "inp_f" (loadgame is the name of the function)
Here's the code:
try: f = open(filename, "r") file_empty = False except FileNotFoundError: file_empty = True # file doesn't exist, error string if file_empty: # empty save file, create a new game g, b = creategame() # this function works 100%... no problems here else: # amount of each pieces tb = 0 tn = 0 cb = 0 cn = 0 fb = 0 fn = 0 db = 0 dn = 0 rb = 0 rn = 0 pb = 0 pn = 0 d = {} # dictionnary for the board n = 0 f_game = "" f_pieces = [] for line in f: # iterate on the file... only if file_empty == False.... if n == 0: # first line contains general game info f_game = line else: # other lines contain coordinates of the pieces f_pieces += [line] n += 1 # increment number of lines... n-1 == number of pieces f.close() # close the file... only if the file was opened... # validating the format of the first line try: temp1 = int(f_game[0]) temp2 = int(f_game[2]) temp3 = int(f_game[4]) temp4 = int(f_game[6]) temp5 = int(f_game[8]) f_game = [temp1, None, temp2, None, temp3, None, temp4, None, temp5] except ValueError: pass # display error message... bad format for i in f_pieces: # iterate on the list that contains information about pieces try: i1 = int(i[0]) i2 = int(i[1]) except ValueError: # bad coordinates... piece is put outside the board i1 = 8 i2 = 8 if i[2] == "T": # rook if i[3] == "B": # white if f_game[2] != 0 and i1 == 0 and i2 == 7: # short white roc is possible... this is the right rook, too did_first_move = False elif f_game[4] != 0 and i1 == 0 and i2 == 0: # long white roc is possible... and this is the right rook, too did_first_move = False else: # it is not one a rook implied ina possible roc did_first_move = True tb += 1 # increment the amount of this piece by 1 globals()["tb" + str(tb)] = Rook.Rook(0, i1, i2, did_first_move) # from the import Rook... which contains class Rook with its initializer that takes 4 args (color, line, column, first_move) if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["tb" + str(tb)] # add it to the board dictionary... key is a tuple... element is a Piece.Piece class else: # black...Rook still if f_game[6] != 0 and i1 == 7 and i2 == 7: # short black roc possible... this is the right rook, too did_first_move = False elif f_game[8] != 0 and i1 == 7 and i2 == 0: # long black roc possible... this is the right rook, too did_first_move = False else: # the rook is not implied in a possible roc did_first_move = True tn += 1 # increment piece type globals()["tn" + str(tn)] = Rook.Rook(1, i1, i2, did_first_move) # once again... from the import that takes 4 args if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["tn" + str(tn)] # put it in the board dictionary elif i[2] == "C": # Knight if i[3] == "B": # white cb += 1 # increment globals()["cb" + str(cb)] = Knight.Knight(0, i1, i2) # from the import... not it takes 3 or 4 args... the last one being optional... as wether a Knight did their first move of not is irrelevant... it is not needed to pass a 4th arg if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["cb" + str(cb)] # put it in the board dictionary else: # black cn += 1 # increment globals()["cn" + str(cn)] = Knight.Knight(1, i1, i2) # create class instance from import... if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["cn" + str(cn)] # put it in the board dictionary elif i[2] == "F": # Bishop if i[3] == "B": # white fb += 1 # increment globals()["fb" + str(fb)] = Bishop.Bishop(0, i1, i2) # create class instance from import... if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["fb" + str(fb)] # put it in the board dictionary else: # black fn += 1 # increment globals()["fn" + str(fn)] = Fou.Fou(1, i1, i2) # create class instance from import... if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["fn" + str(fn)] # put it inside the board dictionary elif i[2] == "D": # Queen if i[3] == "B": # white db += 1 # increment globals()["db" + str(db)] = Queen.Queen(0, i1, i2) # create class instance from import... if i1 < 8 and i2 < 8: # if coordinates are valid... d[(i1, i2)] = globals()["db" + str(db)] # put it in the board dictionary else: # black dn += 1 # increment globals()["dn" + str(dn)] = Queen.Queen(1, i1, i2) # create class instance from import... if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["dn" + str(dn)] # put it inside the board dictionary elif i[2] == "R": # King if i[3] == "B": # white if f_game[2] != 0 or f_game[4] != 0: # white king did not perform its first move did_first_move = False else: # white king did move did_first_move = True rb += 1 # increment globals()["rb" + str(rb)] = King.King(0, i1, i2, did_first_move) # create class instance from the import... pos_r0 = (i1, i2) if i1 < 8 and i2 < 8: # if coordinates are valid... d[(i1, i2)] = globals()["rb" + str(rb)] # put it inside the board dictionary else: # black if f_game[6] != 0 or f_game[8] != 0: # black king did not perform its first move did_first_move = False else: # black king did move first = True rn += 1 # increment globals()["rn" + str(rn)] = King.King(1, i1, i2, did_first_move) # create class instance from import... pos_r1 = (i1, i2) if i1 < 8 and i2 < 8: # if the coordinates are valid... d[(i1, i2)] = globals()["rn" + str(rn)] # put it in the board dictionary else: # pawn if i[3] == "B": # white if i1 == 1: # the pawn is still at its starting position did_first_move = False else: # the pawn moved from its starting position did_first_move = True pb += 1 # increment globals()["pb" + str(pb)] = Pawn.Pawn(0, i1, i2, did_first_move) # create class instance from import if i1 < 8 and i2 < 8: # if coordinates are valid... d[(i1, i2)] = globals()["pb" + str(pb)] # put it in the board dictionary else: # black if i1 == 1: # the pawn is still at its starting position did_first_move = False else: # the pawn moved from its starting position did_first_move = True pn += 1 # increment globals()["pn" + str(pn)] = Pawn.Pawn(0, i1, i2, prem_depl) # create class instance from import... if i1 < 8 and i2 < 8: # if coordinates are valid... d[(i1, i2)] = globals()["pn" + str(pn)] # put it in the board dictionary # create the board class instance from import... which only takes 1 arg... the board itself (dict) b = Board.Board(d) # create the game (GameManagement class instance... from import) # it takes 3 optional args... number of turns since the start of the game, position of white king and position of black king... g = GameManagement.GameManagement(f_game[0], pos_r0, pos_r1) return g, bEdit: Hah. Thanks a lot, i was so stuck on the iteration error i did not even find this when i spent over an hour looking over everything that could cause an iteration error.
It was just the return statement's identation.
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justhalf over 10 yearsI'm a bit faster than you =p