feature request: support non-seekable input files about dbfread HOT 1 OPEN

Thank you! :)

Reading from streams could be useful, but there are a few hurdles:

• The DBF class opens and closes the file when reading the header and opens and closes it again when you iterate over records or do len(). It would have to be rewritten to work like today if you pass a filename and to keep the file open if
  you pass an already open file-like object.
• You could read normal records or deleted records but not both. (Only the first iteration or call to len() would do anything.) This would be inconsistent with the current behaviour.
• Memo files wouldn't work.
• I've already removed one seek and the one that skips to the start of the first record could be a read instead. However reading instead of skipping records could hurt performance for seekable files. (Especially in len().)

Perhaps it's best to rearrange the code and add a StreamingDBF class. This would make the code cleaner and the API less confusing.

I don't have much time to work on dbfread at the moment but feel free to have a go at it. If you do make sure you fork the develop branch.

from dbfread.