GitHub - Detry322/py: Run python expressions more ergonomically from the command line. Inspired by rb.

Run python expressions as commands. Inspired by the wonderful rb project by thisredone.

Here's an abridged (but functional!) version of the code:

#!/usr/bin/env python3

import argparse, base64, collections, collections.abc, csv, glob, gzip, json, math, os, os.path, platform, random, re, sys, time, urllib, uuid, zlib

def execute(_, expression):
    return eval(expression)

for line in sys.stdin:
    result = execute(line.strip(), sys.argv[1])
    if result is not None:
        print(result)

Here's some examples:

# Filter lines outside a range
seq 1 100 | py "_ if 50 < int(_) < 60 else None"

# Retreive data from a CSV
cat demodata.csv | py -f "map(lambda l: l['weekdays'], csv.DictReader(_))"

py's benefit is that it lets you write scripts in a language you're familiar with (python) and saves you from one you might make mistakes in (bash).

Installation

You have multiple options:

Clone this repo and symlink py into your path.
Run: sudo curl https://raw.githubusercontent.com/Detry322/py/master/py -o /usr/local/bin/py && sudo chmod +x /usr/local/bin/py
Copy and paste the code from here into a file named py in your path.

Options

usage: py [-h] [-g] [-f] [-s] [-n] expression

Run one-line python expressions on stdin. The expression has access to local
variable _, containing a single line of input. The expression
also has access to common python stdlib modules (sorted alphabetically):
argparse, base64, collections, csv, glob, gzip, json, math, os, os.path,
platform, random, re, sys, time, urllib, uuid, zlib

positional arguments:
  expression       The expression to run.

optional arguments:
  -h, --help       show this help message and exit
  -g, --generator  Pass stdin as a generator. _ returns stripped lines of
                   stdin
  -f, --file       Pass stdin as a file. _ is set to sys.stdin.
  -s, --string     Pass stdin as a string. _ is set to sys.stdin.read().
  -n, --none       Print None results.

Examples

Retreive data from a CSV

cat demodata.csv | py -f "map(lambda l: l['weekdays'], csv.DictReader(_))"

Filter lines outside a range

seq 1 100 | py "_ if 50 < int(_) < 60 else None"

Compress and output each file in the working directory

ls | py '"{}: {}".format(_, base64.b64encode(zlib.compress(open(_, "rb").read())).decode("ascii"))'