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How to sort the below array of dates on python 2.4
timestamps = ['2011-06-2', '2011-08-05', '2011-02-04', '2010-1-14', '2010-12-13', '2010-1-12', '2010-2-11', '2010-2-07', '2010-12-02', '2011-11-30', '2010-11-26', '2010-11-23', '2010-11-22', '2010-11-16'] 
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To sort a Python date string list using the sort function, you'll have to convert the dates in objects and apply the sort on them. For this you can use the key named attribute of the sort function and provide it a lambda that creates a datetime object for each date and compares them based on this date object.
The key is to turn your strings into something sortable and that's datetime objects ( datetime. strptime ) here. "%d/%b/%Y" is just format of your dates.
Python sorted() Function The sorted() function returns a sorted list of the specified iterable object. You can specify ascending or descending order. Strings are sorted alphabetically, and numbers are sorted numerically. Note: You cannot sort a list that contains BOTH string values AND numeric values.
>>> import datetime >>> dates = [datetime.datetime.strptime(ts, "%Y-%m-%d") for ts in timestamps] >>> dates.sort() >>> sorteddates = [datetime.datetime.strftime(ts, "%Y-%m-%d") for ts in dates] >>> sorteddates ['2010-01-12', '2010-01-14', '2010-02-07', '2010-02-11', '2010-11-16', '2010-11- 22', '2010-11-23', '2010-11-26', '2010-12-02', '2010-12-13', '2011-02-04', '2011 -06-02', '2011-08-05', '2011-11-30'] 
sorted(timestamps, key=lambda d: map(int, d.split('-'))) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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