python - opening several txt files using while loop -


i have txt files names have following pattern: 

arc.1.txt, arc.2.txt,...,arc.100.txt,..., arc.500.txt,...,arc.838.txt

i know can write program using for loop open files 1 one, if total numbers of files. want know possible use while loop without counting number files open them ?

it possible use while loop assuming files numbered in sequential order:

i = 0 while true:     += 1     filename = 'arc.%d.txt' %     try:         open(filename, 'r') file_handle:             ...     except ioerror:         break

though becomes pretty ugly nesting. you're better off getting list of filenames using glob.glob.

from glob import glob filenames = glob('arc.*.txt') filename in filenames:     open(filename) file_handle:         ...

there race conditions associated second approach -- if file somehow gets deleted between when glob found , when time process file program have bad day.


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