How to Call TCL Procedure using Python

Question

Using below code i can able to call all procedure in the Proc.tcl file ,but i want to call individually the procs like sum or sub ,Please let me know any other possibility to call it

My proc file program,

 puts "hello"
    proc sum {a b} {

     set c [expr $a + $b]
     puts "Addition: $c "
    }




  proc sub {a b} {

     set c [expr $a - $b]
     puts "Substraction: $c "
    }

My Main file program,

 import Tkinter
    import os
    r=Tkinter.Tk()
    r.tk.eval('source proc.tcl')

Asked By: Anub

||

Source

Answer 1

I do not know tcl, but this looks logical:

import tkinter
r=tkinter.Tk()
r.tk.eval('source proc.tcl')
r.tk.eval('sum 1 2')
r.tk.eval('sub 1 2')

>>> hello
>>> Addition: 3 
>>> Substraction: -1

Answered By: kalgasnik

Answer 2

Just carry on as you are:

>>> import Tkinter
>>> r = Tkinter.Tk()
>>> r.tk.eval('proc sum {a b} {set c [expr {$a + $b}]; puts "Sum $c"; return $c}')
''
>>> r.tk.eval('sum 2 5')
Sum 7
'7'

So in your case, having sourced the tcl file you can just do r.tk.eval("sum 5 5") to call that procedure.

Note: always brace expr expressions in tcl. As in my example above.

Answered By: patthoyts

Answer 3

If you don’t need the power of Tkinter, you can restructure proc.tcl a little and call the proc via subprocess:

proc.tcl:

proc sum {a b} {
    set c [expr $a + $b]
    puts "Addition: $c "
}

proc sub {a b} {
    set c [expr $a - $b]
    puts "Subtraction: $c "
}

eval $argv; # NOTE 1

caller.py:

import subprocess
import shlex

def tcl(command):
    command_line = shlex.split(command)
    output = subprocess.check_output(command_line)
    return output

print(tcl('tclsh proc.tcl sum 5 8'))
print(tcl('tclsh proc.tcl sub 19 8'))

Output of caller.py:

b’Addition: 13 n’

b’Subtraction: 11 n’

Discussion

Note 1: In the Tcl script, the line eval $argv takes what on the command line and execute it. It does not provide error checking at all, so potentially is dangerous. You will want to check the command line for malicious intention before executing it. What I have here is good for demonstration purpose.
The function tcl in caller.py takes a command line, split it, and call proc.tcl to do the work. It collects the output and return it to the caller. Again, for demonstration purpose, I did not include any error checking at all.

Answered By: Hai Vu

Answer 4

instead of r.tk.eval(‘source proc.tcl’)

try with os.system (‘source proc.tcl’)
and import OS

Answered By: abhi

Answer 5

Use can use r.eval:

r.eval('source proc.tcl')
r.eval('sub {0} {1}'.format(a, b))

You should write just functions in proc.tcl.line like puts "hello" will be executed when evaluated with eval.

Answered By: Kenly

Answer 6

import subprocess

r = subprocess.check_output('tclsh proc.tcl', shell=True)

Answered By: vamsi465

Answer 7

in Caller.py try:

import tkinter
import os

r = tkinter.Tk()
r.tk.evalfile('proc.tcl')
r.tk.eval('sum 1 2')
r.tk.eval('sub 1 2')

also, if you want to give numbers from your Python file, change like:

import tkinter
import os

r = tkinter.Tk()
r.tk.evalfile('proc.tcl')
x = 1
y = 2
r.tk.eval('sum {} {}'.format(x,y))
r.tk.eval('sub {} {}'.format(x,y))

Answered By: Yalcin Isler

How to Call TCL Procedure using Python

Question:

Answers:

proc.tcl:

caller.py:

Output of caller.py:

Discussion