CODEWITHSUNDEEP
pythontkintersubprocess
brucezepplin
brucezepplin

Reputation: 9782

Tkinter program not loading

Hi I am writing a basic GUI using python Tkinter. I can get it to show the interface, however when asking one of my buttons to call a subprocess, the GUI does not load, although there are no errors reported. here is the code for the buttons:

B = Tkinter.Button(root, text ="Reference fasta file", command = openfile).pack()
C = Tkinter.Button(root, text ="SNP file", command = openfile).pack()
D = Tkinter.Button(root, text ="Generate variant fasta(s)", command = subprocess.call(['./myprogram.sh','B','C'],shell=True)).pack()

If I do not include button "D" in my code, the GUI appears. Strangely if I include button "D" and pass a file that does not exist into subprocess.call, the GUI appears, but I get an error message saying file does no exist as expected.

why then does passing a program which does exist in the directory cause the program not to run, without an error message being passed?

Thanks very much

Upvotes: 0

Views: 108

Answers (2)

ambi
ambi

Reputation: 1316

You've passed as command not a function but what is returned by a function (which of course may be a function). So instead of:

D = Tkinter.Button(root, text ="Generate variant fasta(s)", command = subprocess.call(['./myprogram.sh','B','C'],shell=True)).pack()

you should call it like:

def click_callback():
    subprocess.call(['./myprogram.sh','B','C'],shell=True)

D = Tkinter.Button(root, text ="Generate variant fasta(s)", command = click_callback).pack()

Upvotes: 1

furas
furas

Reputation: 143001

Using 

command = subprocess.call(['./myprogram.sh','B','C'],shell=True)

you run subprocess and result is assigned to command=.

command= expect only function name without () and arguments (as ambi said: python callable element)

Probably subprocess is running and script can't run rest of code.

Maybe you need 

def myprogram()
    subprocess.call(['./myprogram.sh','B','C'],shell=True)

command = myprogram

Do you really need subprocess ?

Upvotes: 1

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