Reputation: 109
I am new to Python . I was supposed to create a GUI with multiple menus . On clicking a particular menu a new process should start and it should not hang the User Interface . But i am not able to achieve that . After web searches I have made a similar kind of code .
In this code my aim is to make the "print deep"statement active without hanging the UI (which gets active after clicking (Click Me ))
Please help me in this regard .
import Tkinter
class simpleapp_tk(Tkinter.Tk):
def __init__(self,parent):
Tkinter.Tk.__init__(self,parent)
self.parent = parent
self.initialize()
def initialize(self):
self.grid()
self.entryVariable = Tkinter.StringVar()
self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
self.entry.grid(column=0,row=0,sticky='EW')
self.entry.bind("<Return>", self.OnPressEnter)
self.entryVariable.set(u"Enter text here.")
button = Tkinter.Button(self,text=u"Click me !",
command=self.OnButtonClick)
button.grid(column=1,row=0)
self.labelVariable = Tkinter.StringVar()
label = Tkinter.Label(self,textvariable=self.labelVariable,
anchor="w",fg="white",bg="blue")
label.grid(column=0,row=1,columnspan=2,sticky='EW')
self.labelVariable.set(u"Hello !")
self.grid_columnconfigure(0,weight=1)
self.resizable(True,False)
self.update()
self.geometry(self.geometry())
self.entry.focus_set()
self.entry.selection_range(0, Tkinter.END)
def OnButtonClick(self):
while True:
print 'deep'
def OnPressEnter(self,event):
self.labelVariable.set( self.entryVariable.get()+" (You pressed ENTER)" )
self.entry.focus_set()
self.entry.selection_range(0, Tkinter.END)
if __name__ == "__main__":
app = simpleapp_tk(None)
app.title('my application')
app.mainloop()
Upvotes: 0
Views: 1542
Reputation: 414835
You don't need multiple threads to start an external process. Popen()
doesn't wait for the child process to end. It returns immediately. Here's a complete code example that starts/stops a tkinter progressbar on the start/end of a subprocess without using threads
.
Unrelated: to run while True: print 'deep'; time.sleep(1)
without blocking the GUI (assuming print('deep')
does not block for long), you could use parent.after()
method:
def OnButtonClick(self):
self._step()
def _step(self):
print('deep')
self.parent.after(1000, self._step) # call _step in a second
Upvotes: 0
Reputation: 1008
import threading
class simpleapp_tk(Tkinter.Tk):
# .............................
def OnButtonClick(self):
thr = threading.Thread(target=self.print_deep)
thr.start()
def print_deep(self):
while True:
print 'deep'
If you want to create a new process you need to create separate script that will run in separate process. I still thing that better solution will be using threads.
proc.py
while True:
print('deep')
parent_proc.py
import subprocess
import sys
class simpleapp_tk(Tkinter.Tk):
# .............................
def OnButtonClick(self):
subprocess.Popen(args=['python', 'proc.py'], stdout=sys.stdout])
Upvotes: 1