Lsext

1. Adapted the unpythonic code.

1. Removed the function, `remove_items',
thus making it more unpythonic.

Buggy!
Undebuggable!
Illegible!

Just for fun or challenge. ^_^

Consider pythonizing it next time.

1. Added `-i' option, used to ignore the specified directory
name, e.g. .git.

2. `argparse' is too verbose!
Consider wrapping it into a function.
Or, wrapping the whole module to make a concise one.

3. What a bad programmer!
What a mess!
`operate_all_files'.

4. From now on, use git for version controlling,
not merely for transferring data between github
and my local computer.

1. Employed str.lower since `.pdf' and `.PDF'
should be the regarded as the same extension.
And assumed that all extensions' cases should be insignificant.

2. Changed function names: `compose_function'
to `fcompose', `map_function' to `fmap'.

1. Completed the refactoring in the core function,
`get_all_info'.

1. Changed to returning chained generators,
instead of a list reduced from a list of lists;
in the the core function `get_all_info'.

2. Please refactor the core function `get_all_info',
such that, you can just collect the information
specified by the extracting function
which is provided as one of the arguments to `get_all_info'.
But now i am too exhausted. i have to sleep.
Let 's fix it tomorrow.

3. Happy chinese new year! am i a hard-working
and responsible employee,
one who still keeps coding to deep night
even in the new year's day.