Run perl in python

run perl command in python file

Interact with process: Send data to stdin. Read data from stdout and stderr, until end-of-file is reached. Wait for process to terminate.

Don’t use shell=True , if you want to write and read without waiting for the process to stop. Refer this doc for details.

import subprocess result=subprocess.Popen(['perl','Hello.pl'],stdout=subprocess.PIPE) out,err=result.communicate() print out 

How can i read some arguments from command line and pass as an input . For Ex : perl Hello.pl some_variable_name

You can do that using argparse

import subprocess import argparse parser = argparse.ArgumentParser(description='Test Python Code') parser.add_argument('first_name', metavar='FIRST_NAME', type=str, help='Enter the first name') parser.add_argument('second_name', metavar='SECOND_NAME', type=str, help='Enter the second name') # Parse command line arguments args = parser.parse_args() result=subprocess.Popen(['perl','Hello.pl',args.first_name,args.second_name],stdout=subprocess.PIPE) out,err=result.communicate() print out 

#!/usr/bin/perl -w # (1) quit unless we have the correct number of command-line args $num_args = $#ARGV + 1; if ($num_args != 2) < print "\nUsage: name.pl first_name last_name\n"; exit; ># (2) we got two command line args, so assume they are the # first name and last name $first_name=$ARGV[0]; $last_name=$ARGV[1]; print "First name: $first_name \nSecond name: $last_name\n"; 

Venkatesh Wadawadagi 2773

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README.rst

Haven’t you always dreamed of having the power of Perl at your fingertips when writing Python?

Well, this package is proof that dreams can come true:

>>> import perl >>> value = "Hello there" >>> if value =~ /^hello (.+?)$/i: . print("Found greeting:", $1) . Found greeting: there >>> value =~ s/there/world/ >>> print(value) Hello world

Note: This is very silly and probably shouldn’t go anywhere near production code.

This requires Python 3.7 or later.

The module needs to be loaded before Python tries to read code which uses these enhancements. There are therefore four different ways to use this module:

Pass it to Python on the command line:

python3.7 -m perl myscript.py

Note You only need to import it once in your project. However, because Python needs to read the whole file before it can run the import, you cannot use perl ‘s functionality in the same file where you import perl .

Regular expression matching

val =~ /pattern/flags # or val =~ m/pattern/flags

where pattern uses Python’s regex syntax, and flags is a subset of the characters AILMSXG , which map Python’s single character flags, plus g which mimics the global flag from Perl.

When run without the global flag, the re.Match object is returned; any matched groups will be available as numbered dollar variables, eg $1 , and named groups will be available on $name .

When run with the global flag, the list of re.Match objects will be returned. No dollar variables will be set.

# Case insensitive match value =~ /^foo (.+?) bar$/i print(f"Matched ") # Use in a condition if value =~ /^foo (.+?) bar$/i: return $1 # Use as a global matches = value =~ /foo (.+?) bar/gi;

Regular expression replacement

val =~ s/pattern/replacement/flags

where pattern uses Python’s regex syntax, and flags is a subset of the characters AILMSXG , which map Python’s single character flags, plus g which mimics the global flag from Perl to replace all occurrences of the match.

# Case insensitive global replacement value =~ s/foo/bar/gi # Backreferences value =~ s/(.+?) (?.+?)/$1 $name/

Dollar variables act like regular variables — they can be set and used as normal. They are primarily intended for use with regular expressions — each regex will remove all previous dollar variables, to avoid confusion as to whether they matched or not.

During development, install in a virtual environment:

mkdir python-perl cd python-perl git clone repo virtualenv --python=python3.7 venv . venv/bin/activate cd repo pip install -r requirements.txt

cd path/to/repo . ../venv/bin/activate pytest

To run the example, use one of the following:

$ ./example.py $ python3.7 -m perl example.py $ python3.7 example_importer.py

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