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+--- Thread: How to define a method in a class (/thread-5840.html)
How to define a method in a class - 1885 - Oct-24-2017
I copied this code from zetcode.com
What I want to do is call a method dec3hex2 that returns a string in the form of #000000
I have the dec to hex code completed but I get the following errors:
python draw_tk_example.py
Traceback (most recent call last):
File "draw_tk_example.py", line 33, in <module>
main()
File "draw_tk_example.py", line 28, in main
ex = GraphWin()
File "draw_tk_example.py", line 7, in __init__
self.initUI()
File "draw_tk_example.py", line 20, in initUI
hexc = dec3hex2(self,10)
NameError: name 'dec3hex2' is not defined
How do I call a method from the mothod initUI(self): ?
Thank You!
#http://zetcode.com/gui/tkinter/drawing/
from tkinter import Tk, Canvas, Frame, BOTH
class GraphWin(Frame):
def __init__(self):
super().__init__()
self.initUI()
def dec3hex2(self,d):
#code to convert dec to hex
self.d = d
hexs = str(self.d)
return hexs
def initUI(self):
self.master.title("Colors")
self.pack(fill=BOTH, expand=1)
canvas = Canvas(self)
#call to dec3hex2
hexc = dec3hex2(self,10)
canvas.create_rectangle(30, 10, 120, 80, outline="#fb0", fill="#fb0")
canvas.create_rectangle(150, 10, 240, 80, outline="#f50", fill="#f50")
canvas.create_rectangle(270, 10, 370, 80, outline="#05f", fill="#05f")
canvas.pack(fill=BOTH, expand=1)
def main():
root = Tk()
ex = GraphWin()
root.geometry("400x100+300+300")
root.mainloop()
if __name__ == '__main__':
main()
RE: How to define a method in a class - Lux - Oct-29-2017
I think it needs to be called like this:
self.dec3hex2(10)
RE: How to define a method in a class - wavic - Oct-29-2017
You define the method with self parameter but when you call it, you don't pass it. Only the positional/keyword arguments.
class MyClass:
def method_1(self):
print('One')
def method_2(self, number):
doubled = number * 2
print('Doubled:' , doubled)
return doubled
cl = MyClass()
cl.method_1()
doubled = cl.method_2(10)