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From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Newsgroups: comp.lang.python
Subject: Re: non printable (moving away from Perl)
Date: Fri, 11 Mar 2016 17:34:14 +0100
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On 11.03.2016 15:23, Fillmore wrote:
> On 03/11/2016 07:13 AM, Wolfgang Maier wrote:
>> One lesson for Perl regex users is that in Python many things can be
>> solved without regexes.
>> How about defining:
>>
>> printable = {chr(n) for n in range(32, 127)}
>>
>> then using:
>>
>> if (set(my_string) - set(printable)):
>>      break
>
> seems computationally heavy. I have a file with about 70k lines, of
> which only 20 contain "funny" chars.
>

Not sure what you call computationally heavy. I just test-parsed a 30 MB 
file (28k lines) with:

with open(my_file) as i:
     for line in i:
         if set(line) - printable:
             continue

and it finished in less than a second.