[Tutor] text processing by reading in a character at a time (original) (raw)
Magnus Lyckå magnus at thinkware.se
Sun Jul 18 02:05:55 CEST 2004
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At 17:51 2004-07-17 -0600, ppareek wrote:
Hi, I was wondering if anyone new an efficient way of reading in a character at a time from a file(I want to directly process a character from the file and not by reading in lines because I want to be able to access the postion of the character in the file)
It typically isn't efficient to read files one character at a time, but the simple way to do it is with "f.read(1)" (if f is your file object).
It isn't exactly rocket science to access the position in the file even if you read more characters at a time. What are you trying to do? Do you understand how f.seek() and f.tell() works?
For instance, if you want to modify a file, you can open it in 'rb+' mode, read it all into a string s, and do something like this to replace a certain character with another:
f = open(file_name, 'rb+') s = f.read() for pos, char in enumerate(s): if char == myTarget: f.seek(pos) f.write(myValue)
-- Magnus Lycka (It's really Lyckå), magnus at thinkware.se Thinkware AB, Sweden, www.thinkware.se I code Python ~ The Agile Programming Language
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