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copied!<pre><code>import re pat = re.compile('ENABLEPRINTER|PRINTERLIST|PRNT1.PORT') def jojo(mat,dic = {'ENABLEPRINTER':'y', 'PRINTERLIST':'PRNT3', 'PRNT1.PORT':'734'} ): return dic[mat.group()] with open('configfile','rb+') as f: content = f.read() f.seek(0,0) f.write(pat.sub(jojo,content)) f.truncate() </code></pre> <p>Before:</p> <pre><code>ENABLEPRINTER=n PRINTERLIST=PRNT1, PRNT2 PRNT1.PORT=9600 PRNT1.BITS=8 </code></pre> <p>After:</p> <pre><code>y=n PRNT3==PRNT1, PRNT2 734=9600 PRNT1.BITS=8 </code></pre> <p>Too simple to be definitive. Say what are the errors or weaknesses.</p> <p>The advantage of regexes is they can be modulated easily to particular cases.</p> <p>.</p> <p>EDIT:</p> <p>I've just seen that:</p> <p><em>"what i want to do is assign a new value to the variable "</em></p> <p>you could inform of that earlier !</p> <p>Could you give an exemple of file before / after , please.</p> <p>.</p> <p>EDIT 2</p> <p>Here's the code to change the values of certain variables in a file:</p> <pre><code>import re from os import fsync def updating(filename,dico): RE = '(('+'|'.join(dico.keys())+')\s*=)[^\r\n]*?(\r?\n|\r)' pat = re.compile(RE) def jojo(mat,dic = dico ): return dic[mat.group(2)].join(mat.group(1,3)) with open(filename,'rb') as f: content = f.read() with open(filename,'wb') as f: f.write(pat.sub(jojo,content)) #----------------------------------------------------------- vars = ['ENABLEPRINTER','PRINTERLIST','PRNT1.PORT'] new_values = ['y','PRNT3','8310'] what_to_change = dict(zip(vars,new_values)) updating('configfile_1.txt',what_to_change) </code></pre> <p>Before:</p> <pre><code>ENABLEPRINTER=n PRINTERLIST=PRNT1, PRNT2 PRNT1.PORT=9600 PRNT1.BITS=8 </code></pre> <p>After:</p> <pre><code>ENABLEPRINTER=y PRINTERLIST=PRNT3 PRNT1.PORT=8310 PRNT1.BITS=8 </code></pre>

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