Popular recipes tagged "list_comprehension"

Geocoding Lists via Google Maps (Python)

2012-05-11T05:06:27-07:00

Python recipe 578126 by Mano Bastardo (batch, coordinates, geocode, geocoding, google, google_maps, lat, latitude, list, list_comprehension, lng, longitude, map, web). Revision 2.

A simple script written as an experiment in geocoding addresses in a database. A list of addresses in the form of "100 Any Street, Anytown, CA, 10010" is passed to a Google Maps URL, and the latitude/longitude coordinates are extracted from the returned XML.

XML methods are not used in this script, but simple string searches instead.

Fast Indexing functions (greater than, less than, equal to, and not equal to) (Python)

2012-03-13T16:21:36-07:00

Python recipe 578071 by Garrett (index, list, list_comprehension, numpy, python). Revision 2.

Oftentimes you want to find the index of a list-like object. Numpy arrays, for example, do not have a index member function. These get the job done quickly.

Note: these do not raise exceptions, instead they return -1 on error. You should change that if you want different behavior.

Exception handling in a single line (Python)

2009-10-09T01:07:52-07:00

Python recipe 576872 by Radek Szklarczyk (exception, expression, function, list_comprehension, wrapper). Revision 16.

The rules of duck typing in python encourage programmers to use the "try...except..." clause. At the same time python with new versions enables to use more powerful list comprehensions (for example Conditional Expressions). However, it is impossible to write the "try...except..." clause in a list comprehension. The following recipe "protects" a function against exception and returns a default value in the case when exception is thrown.