Question

I have a class, nothing special, just a regular class:

class WINDOW ():
    def __init__ (self, path):
        ...some unrelated codd...
        self.win = newwin(stdscr.win.getmaxyx() [0]-2, stdscr.win.getmaxyx() [1], 0, 0)
        self.xmax = self.win.getmaxyx() [1]
        self.ymax = self.win.getmaxyx() [0]

    def draw(self,flin,fcol):
        ...code here
        i = 0
        while i < self.ymax -1:
            ...more code here...

When I try to access “self.ymax” in the while loop, I get error, saying that classs WINDOW has no atribute ymax.
What have I done wrong???

Edit:
getmaxyx() returns a tuple of two values.
This is a curses program. I’m using python 3.

Edit 2:
More code – creating an instance of WINDOW:

def main():
    global stdscr
    stdscr = initscr()
    global interface

    interface = INTERFACE(stdscr)
    interface.wins.append(WINDOW(parseArgv()))

    dispatcher()

Parseargv():

def parseArgv():
    #arguments are [filename, PathToFileThatThisProgramOpens]
    if len(argv) == 1:
        return None
    else:
        return argv[-1]

calling draw():

def SwitchWindow(self):
    self.wins[self.currentWindow].empty()
    self.currentWindow += 1 #select next window
    line = self.wins[self.currentWindow].flin
    coll = self.wins[self.currentWindow].fcol
    self.wins[self.currentWindow].draw(line,coll)

Answer 1

Without the full code and traceback it’s impossible to tell, but I have some guesses at the problem:

1. The bit replaced by ...some unrelated codd... actually contains multiple code paths and the code we do see is only executed some of the time so self.ymax isn’t always initialised.
2. Either ...code here or ...more code here... rebinds the name self within the draw() method.
3. majTheHero retyped her/his code instead of using copy and paste and in doing so inadvertently corrected a misspelling of ymax in one of the places it is used.