replacing text in a file with Python

Question

I'm new to Python. I want to be able to open a file and replace every instance of certain words with a given replacement via Python. as an example say replace every word 'zero' with '0', 'temp' with 'bob', and say 'garbage' with 'nothing'.

I had first started to use this:

for line in fileinput.input(fin):         fout.write(line.replace('zero', '0'))         fout.write(line.replace('temp','bob'))         fout.write(line.replace('garbage','nothing')) 

but I don't think this is an even remotely correct way to do this. I then thought about doing if statements to check if the line contains these items and if it does, then replace which one the line contains, but from what I know of Python this also isn't truly an ideal solution. I would love to know what the best way to do this. Thanks ahead of time!

Answer 1

This should do it

replacements = {'zero':'0', 'temp':'bob', 'garbage':'nothing'}  with open('path/to/input/file') as infile, open('path/to/output/file', 'w') as outfile:     for line in infile:         for src, target in replacements.items():             line = line.replace(src, target)         outfile.write(line) 

EDIT: To address Eildosa's comment, if you wanted to do this without writing to another file, then you'll end up having to read your entire source file into memory:

lines = [] with open('path/to/input/file') as infile:     for line in infile:         for src, target in replacements.items():             line = line.replace(src, target)         lines.append(line) with open('path/to/input/file', 'w') as outfile:     for line in lines:         outfile.write(line) 

Edit: If you are using Python 2.x, use replacements.iteritems() instead of replacements.items()