How can I replicate a simple counter, like [f]x[+], in python?
Hi forum!
How would I do this in python?
So far I have this:
x = 0
def increment(x):
print x + 1
return x + 1
x = increment(x)
But every time I run this function I feel that x just disappears or resets itself. Any guidance would be much appreciated.
But every time I run this function I feel that x just disappears or resets itself.
I really don't understand what you mean by that. Your Python code works absolutely fine here.
I'm getting confused because the output from the shell is 1 every time, instead of incrementing like I want it to. Now I really have no idea what I'm doing here, but I'm guessing that every time I run this function, the variable x actually doesn't get saved anywhere, and so it is "resets" to 0. How do I get a stored float to persist like I can in pd?
Probably a silly question, but you are not by any chance always including the first line where you reset the variable x to 0, are you?
@gsagostinho I am! And I know that sounds really dumb because it forces x to 0, but I can't figure out how to avoid this error otherwise: NameError: name 'x' is not defined
Well, you do have to give the variable a starting value at some point, but you don't have to use that part of the code ever again. Have a look:
>>> def increment(x):
... print x + 1
... return x + 1
...
>>> x = 0
>>> x = increment(x)
1
>>> x = increment(x)
2
>>> x = increment(x)
3
>>> x = increment(x)
4
>>> x = increment(x)
5
What exactly are you trying to accomplish?
Cheers,
Gilberto
EDIT: above I am dynamically typing the code and getting the results, hence the >>> and ... before the programming commands.
@gsagostinho By dynamically typing, do you mean just copy and pasting the x = increment(x) line?
No, I mean something else. Python works in two ways: you can either create a python file (.py) and execute it, or you can run the Python Interpreter, which evaluates every single command as you type. Both obviously produce the same results and are just two different ways of accomplishing the same thing.
@gsagostinho Ok so before I was just executing the whole .py program. Using python in the shell, and just copy and pasting the x = increment(x) line, I'm getting the results I was hoping for, so thank you for that!
Awesome!
Here's what I am trying to do: As a programming exercise for myself, I just want to recreate that simple pd counter above. I already coded a little widget in Tkinter that gives me a button and label, and every time I click that button with a mouse I want to increment a counter. I know how to "capture" the event of clicking a button, but I don't know how to make it just execute that one x = increment(x) line of code. I'll see if I can post the rest of my code here.
Cool, glad to hear it works!
But note that if you save the following code to a .py file (let's say test.py):
def increment(x):
print x + 1
return x + 1
x = 0
x = increment(x)
x = increment(x)
x = increment(x)
x = increment(x)
And then execute it with python ./test.py, you also get the expected result:
gilberto@gilberto-Inspiron-7520 ~/$ python ./test.py
1
2
3
4
Cheers!
Gilberto
For anyone curious, here's what I eventually came up with:
import Tkinter as tk
from Tkinter import *
root=tk.Tk()
root.title("button")
var=StringVar()
var.set('bang')
x = 0
def increment():
global x
x += 1
print x
def ButtonClick():
increment()
def ButtonClick2():
print '--------------------\n', 'You closed me :('
root.destroy()
button = tk.Button(root, textvariable=var, command=ButtonClick).grid(row='0', column='0')
button2 = tk.Button(root, text="Close", command=ButtonClick2).grid(row='0', column='1')
root.mainloop()BTW for other beginning users out there like myself, to run this here's what you do:
Oops! Looks like something went wrong!