Calling Shell Commands

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Calling Shell Commands

Mar 7th, 2008

Alright, I'm trying to make a small GUI application that'll allow me to run a .ck file (with ChucK) from a GUI, from a preset directory.

Okay, so I have:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
from Tkinter import *
 
class chuckrun:
 
    def __init__(self, master):
 
        ui = Frame(master)
        ui.pack()
 
	self.file = Entry(ui, text="Filename")
	self.file.pack(side=LEFT)
 
        self.play = Button(ui, text="Play", command=playCk)
        self.play.pack(side=RIGHT)
 
	def playCk(self):
		p = os.popen('chuck')
		# run chuck $HOME/Apps/Source/ChucK/Filename
		# (from the Entry field above)
 
root = Tk()
 
app = chuckrun(root)
 
root.mainloop()
from Tkinter import *

class chuckrun:

    def __init__(self, master):

        ui = Frame(master)
        ui.pack()

	self.file = Entry(ui, text="Filename")
	self.file.pack(side=LEFT)

        self.play = Button(ui, text="Play", command=playCk)
        self.play.pack(side=RIGHT)

	def playCk(self):
		p = os.popen('chuck')
		# run chuck $HOME/Apps/Source/ChucK/Filename
		# (from the Entry field above)

root = Tk()

app = chuckrun(root)

root.mainloop()

In the def playCk(self) part, I have no idea what to do. What I want it to do is to run the command chuck $HOME/Apps/Source/ChucK/filename where filename is the filename specified in the Entry field above (as stated in the comment).

But, what I really need it to do is store the text in the entry field into a variable (x), then call the shell command chuck $HOME/Apps/Source/ChucK/x. But I have no idea how to use variables, say from Python to the shell and vice versa.

Can anyone help me?

Thank you in advance!

Last edited by linux : Mar 7th, 2008 at 9:57 pm.

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Re: Calling Shell Commands

Mar 7th, 2008

You will likely want to use a Tkinter StringVar() with the .get() to get the contents of the entry box. If memory serves - a Google for "Tkinter StringVar Entry" will yield thousands of hits as well
var = Tkinter.StringVar()
entry_box = Tkinter.Entry(frame_name, width=5, textvariable=var)
python_var=var.get() [Under def playCk(self): for your app]
http://infohost.nmt.edu/tcc/help/pub...variables.html
You can run the command using os.system() or subprocess.
os.system("chuck $HOME/Apps/Source/ChucK/" + python_var)

Last edited by woooee : Mar 7th, 2008 at 10:57 pm.

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Re: Calling Shell Commands

Mar 7th, 2008

os.system("chuck $HOME/Apps/Source/ChucK/" + python_var)

EXACTLY what I wanted. Thank you so much.

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Re: Calling Shell Commands

Mar 7th, 2008

Solved, but not totally:

Help with Code Tags

(Toggle Plain Text)

alex@alex-laptop:~/Apps/Source/Python Source$ python chuckrun.py 
Exception in Tkinter callback
Traceback (most recent call last):
  File "lib-tk/Tkinter.py", line 1406, in __call__
    return self.func(*args)
  File "chuckrun.py", line 11, in playCk
    os.system("chuck $HOME/Apps/Source/ChucK/" + filename)
TypeError: cannot concatenate 'str' and 'instance' objects

It shows the GUI, and I input foo.ck, and I get that error.

My full code for this is:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
from Tkinter import *
import os
 
class chuckrun:
 
    def __init__(self, master):
		filename = StringVar()
 
		def playCk():
 
			os.system("chuck $HOME/Apps/Source/ChucK/" + filename)
 
		ui = Frame(master)
		ui.pack()
 
		self.file = Entry(ui, text="Filename", textvariable=filename)
		self.file.pack(side=LEFT)
 
		self.play = Button(ui, text="Play", command=playCk)
		self.play.pack(side=RIGHT)
 
 
root = Tk()
 
app = chuckrun(root)
 
root.mainloop()
from Tkinter import *
import os

class chuckrun:

    def __init__(self, master):
		filename = StringVar()
		
		def playCk():
			
			os.system("chuck $HOME/Apps/Source/ChucK/" + filename)
			
		ui = Frame(master)
		ui.pack()

		self.file = Entry(ui, text="Filename", textvariable=filename)
		self.file.pack(side=LEFT)

		self.play = Button(ui, text="Play", command=playCk)
		self.play.pack(side=RIGHT)

		
root = Tk()

app = chuckrun(root)

root.mainloop()

EDIT: By the way, will:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
def stopCk():
 
	os.system("^C")
def stopCk():

	os.system("^C")

Actually kill the shell command?

Last edited by linux : Mar 7th, 2008 at 11:36 pm.

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Re: Calling Shell Commands

Mar 8th, 2008

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
from Tkinter import *
import os
 
class chuckrun:
 
    def __init__(self, master):
		filename=StringVar()
 
		def playCk():
 
			os.system("chuck " + str(filename))
 
		ui = Frame(master)
		ui.pack()
 
		# Text entry for gathering filename
		self.file = Entry(ui)
		self.file.pack(side=LEFT)
 
		# Play button for executing the file
		self.play = Button(ui, text="Play", command=playCk)
		self.play.pack(side=LEFT)
 
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
 
root = Tk()
root.title("ChucK")
 
app = chuckrun(root)
 
root.mainloop()
from Tkinter import *
import os

class chuckrun:
	
    def __init__(self, master):
		filename=StringVar()
		
		def playCk():
			
			os.system("chuck " + str(filename))
			
		ui = Frame(master)
		ui.pack()

		# Text entry for gathering filename
		self.file = Entry(ui)
		self.file.pack(side=LEFT)

		# Play button for executing the file
		self.play = Button(ui, text="Play", command=playCk)
		self.play.pack(side=LEFT)
		
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
		
root = Tk()
root.title("ChucK")

app = chuckrun(root)

root.mainloop()

I have that so far. However, it seems to be completely ignoring whatever the user puts in the textbox. What am I doing wrong?

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Re: Calling Shell Commands

Mar 8th, 2008

Python variables are different from Tkinter variables. You have to use .get

Help with Code Tags

(Toggle Plain Text)

def playCk():
     python_var=filename.get()
     os.system("chuck " + python_var)

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Re: Calling Shell Commands

Mar 8th, 2008

Help with Code Tags

(Toggle Plain Text)

alex@alex-laptop:~/Apps/Source/Python Source$ python chuckrun.py 
  File "chuckrun.py", line 9
    def playCk():
    ^
IndentationError: unexpected indent
alex@alex-laptop:~/Apps/Source/Python Source$

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
#!/usr/bin/python/
from Tkinter import *
import os
 
class chuckrun:
 
    def __init__(self, master):
    	filename=StringVar()
		def playCk():
 
			python_var=filename.get()
			os.system("chuck " + python_var)
 
		ui = Frame(master)
		ui.pack()
 
		# Text entry for gathering filename
		self.file = Entry(ui)
		self.file.pack(side=LEFT)
 
		# Play button for executing the file
		self.play = Button(ui, text="Play", command=playCk())
		self.play.pack(side=LEFT)
 
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
 
root = Tk()
root.title("ChucK")
 
app = chuckrun(root)
 
root.mainloop()
#!/usr/bin/python/
from Tkinter import *
import os

class chuckrun:
	
    def __init__(self, master):
    	filename=StringVar()
		def playCk():
			
			python_var=filename.get()
			os.system("chuck " + python_var)
		
		ui = Frame(master)
		ui.pack()

		# Text entry for gathering filename
		self.file = Entry(ui)
		self.file.pack(side=LEFT)

		# Play button for executing the file
		self.play = Button(ui, text="Play", command=playCk())
		self.play.pack(side=LEFT)
		
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
			
root = Tk()
root.title("ChucK")

app = chuckrun(root)

root.mainloop()

That error doesn't seem logical to me. My indent seems to be in the right place, isn't it?

Last edited by linux : Mar 8th, 2008 at 1:17 pm.

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Re: Calling Shell Commands

Mar 8th, 2008

We all have programs that are out to get us. This one is yours. See anything unusual here

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    def __init__(self, master):
    	filename=StringVar()
		def playCk():

When you can't find a problem on the line of the error, look at the previous line as well.

Last edited by woooee : Mar 8th, 2008 at 2:29 pm.

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Re: Calling Shell Commands

Mar 8th, 2008

I actually indented the filename=StringVar() over one more, and it executes fine. However, it issues the chuck command before the user enters the information and says chuck: No input files. How can I make it wait?

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