Python tail is a simple implementation of GNU tail and head.
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Python tail is a simple implementation of GNU tail and head.
It provides 3 main functions that can be performed on any file-like object that supports seek()
and tell()
.
tail
- read lines from the end of a filehead
- read lines from the top of a filefollow
- read lines as a file growsIt also comes with pytail
, a command line version offering the same functionality as GNU tail. This can be particularly useful on Windows systems that have no tail equivalent.
Tailer on GitHub <http://github.com/six8/pytailer>
_Tailer on Pypi <http://pypi.python.org/pypi/tailer>
_Install with pip
or easy_install
.
::
pip install tailer
::
import tailer f = open('test.txt', 'w') for i in range(11): f.write('Line %d\n' % (i + 1)) f.close()
::
# Get the last 3 lines of the file
tailer.tail(open('test.txt'), 3)
# ['Line 9', 'Line 10', 'Line 11']
::
# Get the first 3 lines of the file
tailer.head(open('test.txt'), 3)
# ['Line 1', 'Line 2', 'Line 3']
::
# Follow the file as it grows
for line in tailer.follow(open('test.txt')):
print line
Tailer currently only has doctests.
Run tests with nose::
nosetests --with-doctest src/tailer
Run tests with doctest::
python -m doctest -v src/tailer/__init__.py