[newbie]How to write lines of code in stdout ( like ksh -x option)?

[Quinn Dunkan]

On Sat, 20 Jan 2001 17:55:12 +0100, Pierre-Louis Gaucheron
<pilou_g at club-internet.fr> wrote:
>Hello,
>I am looking for a simple way to write each line interpreted on standard
>output for debugging purpose like the set -x option in Korn shell.
>I didn't find this information in any documentation, so here I am.
>Thanks

See the 'sys.settrace()' and 'pdb' documentation.

#!/usr/local/bin/python
import sys, linecache

def trace(fr, evt, arg):
    if evt == 'line':
        f = fr.f_code.co_filename
        n = fr.f_lineno
        print '%s:%d -> ' %(f, n), linecache.getline(f, n),
    return trace

def main():
    print 'hello'
    x = 10
    y = x * 2
    print y

if __name__ == '__main__':
    sys.settrace(trace)
    main()