Using the (non-standard yet) path module (http://www.jorendorff.com/articles/python/path/), your code can be simplified to:
from path import path, copy
def copy_first_match(repository, filename, dest_dir):
try:
first_match = path(repository).walkfiles(filename).next()
except StopIteration:
return False
else:
copy(first_match, dest_dir)
return True
I/O exceptions are left to propagate to the caller.
George
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