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Full Discussion: Python (startswith) reg expression
Top Forums Shell Programming and Scripting Python (startswith) reg expression Post 302316494 by ghostdog74 on Friday 15th of May 2009 09:34:02 AM
Old 05-15-2009
Quote:
Originally Posted by research3
should be:

#!/usr/bin/env python


import sys


data=open(sys.argv[1]).read().split("\n")
for n,items in enumerate(data):
if not items.startswith('[0-9]'):
data[n-1]= data[n-1]+items
data.pop(n)


print '\n'.join(data)




Can I use regular expression at Phyton (startswith)?

I have carried out an investigation but unfortunately up till now I haven't found the right solution.

Any suggestion ??

Thanks in advance!
put your Python code in code tags. Python indentation is important so if you don't put in code tags, its hard to troubleshoot. of course you can use regular expression, using the re module. (i will leave it to you to read the docs if you are interested).
but for this case (and most cases), regular expression is not needed. you just take the first character of the line and check for isdigit(). eg
Code:
import sys
data=open(sys.argv[1]).read().split("\n")
for n,items in enumerate(data):
    if items[0].isdigit(): # check first character is a digit, ie equivalent to [0-9]
        data[n-1]= data[n-1]+items
        data.pop(n)

in a Python string, first character is position 0, second character position 1 and so on. so if you want to get third character of string, its string[2]. read the Python docs and study how Python works.
 

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LEARN ABOUT DEBIAN

idle

IDLE(1) 						      General Commands Manual							   IDLE(1)

NAME

       IDLE - An Integrated DeveLopment Environment for Python

SYNTAX

       idle [ -dins ] [ -t title ] [ file ...]

       idle [ -dins ] [ -t title ] ( -c cmd | -r file ) [ arg ...]

       idle [ -dins ] [ -t title ] - [ arg ...]

DESCRIPTION

       This  manual page documents briefly the idle command.  This manual page was written for Debian because the original program does not have a
       manual page.  For more information, refer to IDLE's help menu.

       IDLE is an Integrated DeveLopment Environment for Python. IDLE is based on Tkinter, Python's bindings to the Tk widget  set.  Features  are
       100%  pure  Python, multi-windows with multiple undo and Python colorizing, a Python shell window subclass, a debugger. IDLE is cross-plat-
       form, i.e. it works on all platforms where Tk is installed.

OPTIONS

       -h     Print this help message and exit.

       -n     Run IDLE without a subprocess (see Help/IDLE Help for details).

       The following options will override the IDLE 'settings' configuration:

       -e     Open an edit window.

       -i     Open a shell window.

       The following options imply -i and will open a shell:

       -c cmd Run the command in a shell, or

       -r file
	      Run script from file.

       -d     Enable the debugger.

       -s     Run $IDLESTARTUP or $PYTHONSTARTUP before anything else.

       -t title
	      Set title of shell window.

       A default edit window will be bypassed when -c, -r, or - are used.

       [arg]* and [file]* are passed to the command (-c) or script (-r) in sys.argv[1:].

EXAMPLES

       idle   Open an edit window or shell depending on IDLE's configuration.

       idle foo.py foobar.py
	      Edit the files, also open a shell if configured to start with shell.

       idle -est "Baz" foo.py
	      Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell window with the title "Baz".

       idle -c "import sys; print sys.argv" "foo"
	      Open a shell window and run the command, passing "-c" in sys.argv[0] and "foo" in sys.argv[1].

       idle -d -s -r foo.py "Hello World"
	      Open a shell window, run a startup script, enable the debugger, and run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in
	      sys.argv[1].

       echo "import sys; print sys.argv" | idle - "foobar"
	      Open a shell window, run the script piped in, passing '' in sys.argv[0] and "foobar" in sys.argv[1].

SEE ALSO

       python(1).

AUTHORS

       Various.

								 21 September 2004							   IDLE(1)
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