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pytimeparse: time expression parser

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Copyright (c) 2014 Will Roberts wildwilhelm@gmail.com

Licensed under the MIT License (see source file timeparse.py for
details).

A small Python library to parse various kinds of time expressions,
inspired by
this StackOverflow question <http://stackoverflow.com/questions/4628122/how-to-construct-a-timedelta-object-from-a-simple-string>_.

The single function pytimeparse.timeparse.timeparse defined in the
library (also available as pytimeparse.parse) parses time
expressions like the following:

32m
2h32m
3d2h32m
1w3d2h32m
1w 3d 2h 32m
1 w 3 d 2 h 32 m
4:13
4:13:02
4:13:02.266
2:04:13:02.266
2 days, 4:13:02 (uptime format)
2 days, 4:13:02.266
5hr34m56s
5 hours, 34 minutes, 56 seconds
5 hrs, 34 mins, 56 secs
2 days, 5 hours, 34 minutes, 56 seconds
1.2 m
1.2 min
1.2 mins
1.2 minute
1.2 minutes
172 hours
172 hr
172 h
172 hrs
172 hour
1.24 days
5 d
5 day
5 days
5.6 wk
5.6 week
5.6 weeks

It returns the time as a number of seconds (an integer value if
possible, otherwise a floating-point number)::

>>> from pytimeparse import parse
>>> parse('1.2 minutes')
72

A number of seconds can be converted back into a string using the
datetime module in the standard library, as noted in
this other StackOverflow question <http://stackoverflow.com/questions/538666/python-format-timedelta-to-string>_::

>>> from pytimeparse import parse
>>> import datetime
>>> parse('1 day, 14:20:16')
138016
>>> str(datetime.timedelta(seconds=138016))
'1 day, 14:20:16'

Future work

Give the user more flexibility over which characters to use as
separators between fields in a time expression (e.g., + might
be useful).
Internationalisation?
Wow, https://github.com/bear/parsedatetime .

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