Hi All,

When the "Launch" button is pressed, this code would launch an external Python script.
It worked just fine for some time. Now whenever I try to get Gambas3 to run an external Python file (any file),
I get the error message shown below referring to : Permission denied.

Does anyone have an idea why this happens and what may be the solution?


ERROR MESSAGE in the debug window….
/bin/sh: 1: /home/veggie/Desktop/CallOptionCalc/python3/DoAnalysis: Permission denied

What happens if you run that exact string in a terminal?

sarpomira said

Hi All,

When the "Launch" button is pressed, this code would launch an external Python script.
It worked just fine for some time. Now whenever I try to get Gambas3 to run an external Python file (any file),
I get the error message shown below referring to : Permission denied.

Does anyone have an idea why this happens and what may be the solution?

Code (gambas)

1. public sub cmd_Launch()
2.  
3.   'Path to the external Python Script  
4.   'Specify the path to run the Python script
5.   Dim FileAppPath As String
6.   FileAppPath = "/home/veggie/Desktop/CallOptionCalc/python3/DoAnalysis.py"
7.  
8.   'Launch the external application
9.    Shell FileAppPath
10.  
11. End

ERROR MESSAGE in the debug window….
/bin/sh: 1: /home/veggie/Desktop/CallOptionCalc/python3/DoAnalysis: Permission denied

is the files executable flag set?
If not you'll have to use
Shell "python " & FileAppPath
or Exec ["python", FileAppPath]

or make it executable for it's shebang line to work as expected.
chmod +x /home/veggie/Desktop/CallOptionCalc/python3/DoAnalysis.py

PS. is your Shell using bash or sh?  by default it uses sh but it can be better with bash

Change the Shell your app uses to bash like this..


but often when an archive is unpacked somewhere all the +x flags get removed from scripts. (it's probably just that) using the python command to launch them or making the scripts executable should fix it for you.

I simplified the troubleshooting as much as possible and added two test lines as suggested by Bruce.
I created a "Hello World" script called Hello.py and placed it on the desktop.( It runs fine in the linux shell)
When I call the file from Gambas using "Shell" I get the following error.

/home/veggie/Desktop/Hello.py: 1: Syntax error: word unexpected (expecting ")")
I don't know if this is a Gambas error or an OS error.?


PS: I ran the program with the various "chmod" and Shell lines shown above but the result is still "access denied" or   expecting ")"

I'm only getting access denied if the executable flag is not set.
I just made a quick helloworld.py in $HOME
<HIGHLIGHT highlight="python">

#!/usr/bin/env python
print ("hello world")

</HIGHLIGHT>

Terminal went like this..

And running Shell "~/helloworld.py" in gambas printed "hello world" to console as expected.

Does the file in question have a shebang line as it's first line?
#!/usr/bin/env python

If it is something normally launched by something else the something else may know it is a python script and a shebang line was never added.
if not it will need to be run explicitly with python.

Ps. your commented Shell command
  'Shell "python" & FileAppPath

Should be
  'Shell "python " & FileAppPath
(a space after python)

You could maybe do some manual handling..

Something like that ?

Did your python hello world use parentheses?

that'd be a "you" error  

print "hello world"
that's wrong with python

print ("hello world")
that's correct.