Calling Shell Commands

[linux]

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:

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/[I]filename[/I] 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!

[woooee]

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/pubs/tkinter/control-variables.html
You can run the command using os.system() or subprocess.
os.system("chuck $HOME/Apps/Source/ChucK/" + python_var)

[linux]

os.system("chuck $HOME/Apps/Source/ChucK/" + python_var) EXACTLY what I wanted. Thank you so much.

[linux]

Solved, but not totally:

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:

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:

def stopCk():

	os.system("^C")

Actually kill the shell command?

[linux]

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?

[woooee]

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

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

[linux]

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$

#!/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?

[woooee]

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

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.

[linux]

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?

[linux]

Sorry for the bump.
But, bump!

Can anyone help?

[woooee]

Here is something I had lying around. It's not all that good but does what you want

class EntryDemo :

    def __init__( self ) :
        self.top = Tkinter.Tk()

        self.text=""

        self.text_tk = Tkinter.StringVar()
        label1 = Tkinter.Label(self.top, text = "Enter Text" )
        label1.pack()

        frame_s = Tkinter.Frame( self.top )
        label_s = Tkinter.Label( frame_s, text = "Text " )
        label_s.pack( side = "left" )
        entry_s = Tkinter.Entry(frame_s, width=5, textvariable=self.text_tk)
        entry_s.pack( side = "right")
        frame_s.pack()
      
        cont = Tkinter.Button(self.top, text='PRINT',
               command=self.get_text, bg='blue', fg='white' )
        cont.pack(fill=Tkinter.X, expand=1)

        exit=  Tkinter.Button(self.top, text='FORGET IT',
               command=self.top.quit, bg='red', fg='white' )
        exit.pack(fill=Tkinter.X, expand=1)

        self.top.mainloop()

    def get_text( self ) :
        self.text = self.text_tk.get()
        print "text entered was", self.text

##----------------------------------------------------------------------
if __name__ == "__main__":
   ED=EntryDemo()
   print "Class's text =", ED.text

[linux]

alex@alex-laptop:~/Apps/Source/Python Source$ python chuckrun.py 
Traceback (most recent call last):
  File "chuckrun.py", line 39, in <module>
    app = chuckrun(root)
  File "chuckrun.py", line 24, in __init__
    self.play = Button(ui, text="Play", command=playCk())
UnboundLocalError: local variable 'playCk' referenced before assignment
alex@alex-laptop:~/Apps/Source/Python Source$

My code is:

#!/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)
			
		def playCk():
			
			python_var=filename.get()
			os.system("chuck " + python_var)
			
root = Tk()
root.title("ChucK")

app = chuckrun(root)

root.mainloop()

The ''' part is to place where the function was before. But... Why is it giving me the error that I can't call it? I realize it's below when I call the function, but how can I make it see it beforehand?

[woooee]

The class can not find playCk, should be
def playCk(self):
and the command should be
command=self.playCk()
If you really do want to define playCk outside of the class, then the def playCk() et al must come before the class.

[linux]

My code:

#!/usr/bin/python/
from Tkinter import *
import os

class chuckrun:
	
    def __init__(self, master):
    		filename=StringVar()
		'''		
		def playCk(self):
			
			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=self.playCk())
		self.play.pack(side=LEFT)
		
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
		
		def playCk(self):
			
			python_var=filename.get()
			os.system("chuck " + python_var)
			
root = Tk()
root.title("ChucK")

app = chuckrun(root)

root.mainloop()

Error:

Traceback (most recent call last):
  File "chuckrun.py", line 38, in <module>
    app = chuckrun(root)
  File "chuckrun.py", line 23, in __init__
    self.play = Button(ui, text="Play", command=self.playCk())
AttributeError: chuckrun instance has no attribute 'playCk'

----

My code:

#!/usr/bin/python/
from Tkinter import *
import os

class chuckrun:
	
    def __init__(self, master):
    		filename=StringVar()
		
		def playCk(self):
			
			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=self.playCk())
		self.play.pack(side=LEFT)
		
		# Kills the application
		self.close = Button(ui, text="Close", command=ui.quit)
		self.close.pack(side=LEFT)
		'''
		def playCk(self):
			
			python_var=filename.get()
			os.system("chuck " + python_var)
		'''
root = Tk()
root.title("ChucK")

app = chuckrun(root)

root.mainloop()

Same error.

Did I understand your suggestion?

[woooee]

You have def playCk(self): indented incorrectly again. It should be at the same level as __init__

class EntryDemo :

    def __init__( self ) :
        self.top = Tkinter.Tk()
        self.top.geometry("225x100+10+10" )
        self.text=""

        self.text_tk = Tkinter.StringVar()
        label1 = Tkinter.Label(self.top, text = "Enter Filename" )
        label1.pack()

        frame_s = Tkinter.Frame( self.top )
        label_s = Tkinter.Label( frame_s, text = "Text " )
        label_s.pack( side = "left" )
        entry_s = Tkinter.Entry(frame_s, width=25, textvariable=self.text_tk)
        entry_s.pack( side = "right")
        frame_s.pack()
      
        cont = Tkinter.Button(self.top, text='Play File',
               command=self.get_text, bg='blue', fg='white' )
        cont.pack(fill=Tkinter.X, expand=1)

        exit=  Tkinter.Button(self.top, text='FORGET IT',
               command=self.top.quit, bg='red', fg='white' )
        exit.pack(fill=Tkinter.X, expand=1)

        entry_s.focus_set()
        self.top.mainloop()

    def get_text( self ) :
        self.text = self.text_tk.get()
        print "get_text --> text entered was", self.text
        ##os.system( "chuck " + self.text )     ## you could also play from here
        self.top.destroy()

##----------------------------------------------------------------------
if __name__ == "__main__":
   ED=EntryDemo()
   print "Class's text =", ED.text
   os.system( "chuck " + ED.text )

[linux]

File "chuckrun.py", line 32
    def playCk(self):
                    ^
IndentationError: unindent does not match any outer indentation level

Hmm...

[linux]

Bumpppppp. Can someone help?