On Sun, 29 Nov 2015 13:36:57 -0800, Mr Zaug wrote:
> result = re.sub(pattern, repl, string, count=0, flags=0);
re.sub works on a string, not on a file.
Read the file to a string, pass it in as the string.
Or pre-compile the search pattern(s) and process the file line by line:
import re
patts = [
(re.compile("axe"), "hammer"),
(re.compile("cat"), "dog"),
(re.compile("tree"), "fence")
]
with open("input.txt","r") as inf, open("output.txt","w") as ouf:
line = inf.readline()
for patt in patts:
line = patt[0].sub(patt[1], line)
ouf.write(line)
Not tested, but I think it should do the trick.
Or use a single patt and a replacement func:
import re
patt = re.compile("(axe)|(cat)|(tree)")
def replfunc(match):
if match == 'axe':
return 'hammer'
if match == 'cat':
return 'dog'
if match == 'tree':
return 'fence'
return match
with open("input.txt","r") as inf, open("output.txt","w") as ouf:
line = inf.readline()
line = patt.sub(replfunc, line)
ouf.write(line)
(also not tested)
--
Denis McMahon, denismfmcma...@gmail.com
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