Python not working like it should

[chimera]

OK a rather weird and disturbing experience:
I open up the interactive python shell (open terminal and type python)
I enter:
print "trk"
and I get a normal output.

Now, if make a trk.py file with the same line of code in it, set the perimissions to execute, and try to execute it(by double clickingit, and clicking "run in terminal",a terminal window just opens and closes in a moment, and if I click "run", nothing happens. What am I doing wrong?

[thumper]

Your program prints then exits.

Run it in a terminal with ./trk.py (assuming it is in the current directory) and you'll see it print and go back to the prompt.

[chimera]

Your program prints then exits.

Run it in a terminal with ./trk.py (assuming it is in the current directory) and you'll see it print and go back to the prompt.


chimera@HOMEPC:~$ ./trk.py
Warning: unknown mime-type for "trk" -- using "application/*"
Error: no such file "trk"
chimera@HOMEPC:~$

[Wallakoala]

you can also add the line:
raw_input()
at the botton to make it so that it waits for any form of input before exiting

[toojays]

Does the first line of your file say "#!/usr/bin/python"?

The shell needs this line to know which interpreter to pass your script to.

[chimera]

toojays, yes, that's what was missing apparently. thanks for the help, it works now.

[doas777]

I'm having a similar issue, but I'm afraid the bangline didn't do it for me.

does anyone see anything wrong here?

#!/usr/bin/python
print "Hello, World!"


the file is executable:

# ls -l
total 4
-rwxr-xr-x 1 <user> <user> 42 2007-12-28 17:01 hello.py


and python exists at /usr/bin/python:

# ls -l /usr/bin | grep python
lrwxrwxrwx 1 root root 23 2007-12-23 15:50 pdb2.5 -> ../lib/python2.5/pdb.py
lrwxrwxrwx 1 root root 9 2007-12-23 15:49 python -> python2.5
-rwxr-xr-x 1 root root 1158452 2007-10-05 10:17 python2.5
lrwxrwxrwx 1 root root 29 2007-12-23 15:49 pyversions -> ../share/python/pyversions.py
-rwxr-xr-x 1 root root 3179 2007-10-05 10:01 xmlproc_parse.python-xml
-rwxr-xr-x 1 root root 4211 2007-10-05 10:01 xmlproc_val.python-xml


but when I execute it with:

# hello.py
bash: hello.py: command not found


or

# . hello1.py
Warning: unknown mime-type for "Hello, World!" -- using "application/*"
Error: no such file "Hello, World!"


but

# python hello.py
Hello, World!



some times I've noticed that banglines mysteriously work if you put a space between the #! and the first /, but that results in this:

# hello.py
bash: hello.py: command not found
# . hello.py
" -- using "application/*" for "Hello, World!
"rror: no such file "Hello, World!


any ideas?

[RafG]

but when I execute it with:

# hello.py
bash: hello.py: command not found



This will not work, unless "." (the current directory) is in your $PATH (don't be tempted to add it there, though, because that's a security risk!!).

Execute like this:

$ ./hello.py

[ghostdog74]

any ideas?
yes , learn how to use the shell.

[pmasiar]

any ideas?

Use IDLE - simple Python IDE. You can edit code in it, then run it.

[Majorix]

yes , learn how to use the shell.

Don't be so rude, we all had our times.

Use the way RafG defined and you should be fine.

[ghostdog74]

Don't be so rude, we all had our times.
that guy asked for ideas, i gave him the best one. Now why is that rude? OS knowledge is closely intertwined with how you work with programming languages as well.

[doas777]

Thanks folks,
for now I'm just calling python implicitly (since I want to hook scripts to nautilus-actions) so I'll keep that in mind in future. I had been thinking that since my pwd was the dir the script was in, that I could neglect pathing, but that does not appear to be the case.

one of the things I like about linux, is that it forces me to learn a little almost everytime I login. in that vein, GD74, do you have any "required reading" on BASH?

Happy new year

[ghostdog74]

in that vein, GD74, do you have any "required reading" on BASH?


1) Advanced Bash guide (http://tldp.org/LDP/abs/html/)
2) Unix CD bookshelf (http://www.unix.org.ua/orelly/)
3) Learning the bash shell (http://211.99.128.10/Tech/OReilly.Learning.the.bash.Shell.2nd.Edition.chm)