python - Trying to Print List: Getting Empty -


here code:

>>> f=open('list.txt') >>> print list(f) ['bird\n', 'cat\n', 'cat\n', 'cat\n', 'tree'] >>> mylist=list(f) >>> print mylist []    >>> print list(f) []

why list empty??? earlier in code shows list correct list. further, why first command "print mylist" showing empty list? had set mylist=list(f). thanks.

because read whole file. once have read file, file pointer has been moved end , no more data 'found' beyond point.

re-open file or seek start:

f.seek(0)

note first line print list(f); exhausted file iterator (moved file pointer end of te file).

your next statement mylist=list(f), tries read f again. file pointer still @ end of file, no data returned when reading , empty list created.


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