grep in Python (Python)

2014-03-05T19:47:50-08:00

Python recipe 578845 by Andy Dustman (generator, grep, search).

The grep() function is inspired by UNIX grep, but is not limited to string patterns and files or streams.

Access grep from python (Python)

2010-02-24T08:30:25-08:00

Python recipe 577069 by Daniel Cohn (files, grep, linux).

The recipe below passes a filename and an argument to grep, returning the stdout and stderr. Each line in the stdout will have its line number prepended.

Flatten XML to XPath syntax lines (Python)

2011-01-19T16:05:24-08:00

Python recipe 577547 by Raphaël Jolivet (flatten, grep, sed, xml, xpath).

This script acts like xml2. It transforms a XML file into a flat text output, with XPath-like syntax, one line per XML node or attribute. This format is more suitable for working with standard unix CLI utils (sed, grep, ... etc).

uniform matcher( "re pattern" / re / func / dict / list / tuple / set ) (Python)

2009-05-06T06:17:16-07:00

Python recipe 576741 by denis (grep, re, text_processing, uniform). Revision 2.

matcher() makes a string matcher function from any of:

"RE pattern string"
re.compile()
a function, i.e. callable
a dict / list / tuple / set / container

This uniformity is simple, useful, a Good Thing.

A few example functions using matchers are here too: grep getfields kwgrep.

Cheap-date trick; a different way to parse (Python)

2012-03-06T14:08:10-08:00

Python recipe 578064 by Scott S-Allen (cheap, date, format, grep, parse, regex, sharp).

... a light meal with a heavy dose of "tutorial mash" on the side.

In the constructive spirit of "more ways to solve a problem"; this is a portion of my lateral, occasionally oblique, solutions. Nothing new in le régime de grande, but hopefully the conceptual essence will amuse.

Initially started as a response to recipe 577135 which parses incremental date fragments and preserves micro-seconds where available. That script does more work than this, for sure, but requires special flow-control and iterates a potentially incumbering shopping list (multi-dimensional with some detail).

So here's a different box for others to play with. Upside-down in a sense, it doesn't hunt for anything but a numerical "pulse"; sequences of digits punctuated by other 'stuff' we don't much care about.

Missing a lot of things, intentionally, this snippet provides several examples demoin' flexibility. Easy to button-up, redecorate and extend later for show, till then the delightful commentary makes it hard enough to see bones already -- all six lines or so!

Note: The core script is repeated for illustrative purposes. The first is step-by-step, the second is lean and condensed for utilitarian purposes. It is the second, shorter, version that I yanked from a file and gussied up.

find + grep (Bash)

2013-09-17T08:48:07-07:00

Bash recipe 578661 by yota (find, grep, zsh). Revision 2.

look for a text pattern in files defined by a pattern. First argument is passed to the find command, second one to the grep

./find_n_grep.sh '*.py' 'dict'