TOXiC wrote: > Hi everyone, > First I say that I serched and tryed everything but I cannot figure > out how I can do it. > I want to open a a file (not necessary a txt) and find and replace a > string. > I can do it with: > > import fileinput, string, sys > fileQuery = "Text.txt" > sourceText = '''SOURCE''' > replaceText = '''REPLACE''' > def replace(fileName, sourceText, replaceText): > > file = open(fileName, "r") > text = file.read() #Reads the file and assigns the value to a > variable > file.close() #Closes the file (read session) > file = open(fileName, "w") > file.write(text.replace(sourceText, replaceText)) > file.close() #Closes the file (write session) > print "All went well, the modifications are done" > > replacemachine(fileQuery, sourceText, replaceText) > > Now all went ok but I'm wondering if it's possible to replace text if / > sourceText/ match a regex. > Help me please! > Thx in advance > > Try this:
>>> import SE # from http://cheeseshop.python.org/pypi/SE/2.3 >>> replacements = 'SOURCE=REPLACE "another source=another replace" ~[0-9]+~=>>int<< ~[0-9]+\\.[0-9]+~=>>float<< ~' # Define as many replacements as you like. Identify regexes placing them between '~' >>> Stream_Editor = SE.SE (replacements) >>> Stream_Editor (input_file, output_file) That's it. PS 1: Your Stream_Editor accepts strings as well as file names and then returns a string by default. This is a great help for developing substitution sets interactively. >>> print Stream_Editor (''' If it works, this SOURCE should read REPLACE and another source should become another replace and this 123456789 should become >>int<< and this 12345.6789 is a float and so should read >>float<<.''') If it works, this REPLACE should read REPLACE and another replace should become another replace and this >>int<< should become >>int<< and this >>float<< is a float and so should read >>float<<. PS 2: It is convenient to keep large and frequently used substitution sets in text files. The SE constructor accepts a file name instead of the replacements string: >>> Stream_Edtor = SE.SE ('path/replacement_definitions_file') Regards Frederic -- http://mail.python.org/mailman/listinfo/python-list
