TextReplace

Sometimes you want to get these darn AK.... refseq names translated to something more readable. Using a file of <refseq>tab<name> (from the kgxref-table?) I translate them to normal names with the following script.

Unlike an sql query this appends ALL names for given refseq and can be used on virtually any text file where you want to translate anything into something else. Isn't there a Unix-Command for this somewhere? (I think you are referring to the sed command --Hiram )

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Hmm. You mean I could rewrite the replacement-file with gawk into something like "s/from1/from1,to1/g s/from2/from2,to2/g s/from3/from3,to3/g" etc... that should replace and append all possible replacements. That's right, I haven't thought of that...kind of forgot about the possibily to generate long sed scripts and then hand them over to sed with -f... :-(

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#!/usr/bin/python

from sys import *
from optparse import OptionParser
import re

# === COMMAND LINE INTERFACE, OPTIONS AND HELP ===
parser = OptionParser("%prog [options] replaceList textfile: split lines from textfile into words and try to replace words using a replacement list-textfile (format: from tab to).")
parser.add_option("-s", "--splitChars", dest="splitChars", action="store", help="use these ch
aracters to split textfile when searching for matches", default="\t ")

(options, args) = parser.parse_args()
splitChars = options.splitChars
splitCharsRe = re.compile(splitChars)

# ----------- MAIN --------------
if args==[]:
    parser.print_help()
    exit(1)

replFName = args[0]
txtFName = args[1]

# read repl file into dict
replFile = open(replFName,"r")
repl = {}
for l in replFile:
    if l.startswith("#"):
        continue
    (fromStr, toStr) = l.strip().split("\t")
    if fromStr not in repl:
        repl[fromStr] = toStr
    else:
        repl[fromStr] += "," + toStr

replFile.close()

# iterate over lines of textfile and replace
if txtFName!="stdin":
    txtFile = open(txtFName, "r")
else:
    txtFile = stdin
for l in txtFile:
    if l.startswith("#"):
        continue
    # fs = l.split()
    fs = splitCharsRe.split(l.strip())
    for field in fs:
        if field in repl:
            l = l.replace(field, repl[field])
    print l,