Popular recipes tagged "list_comprehension" but not "lng"http://code.activestate.com/recipes/tags/list_comprehension-lng/2012-03-13T16:21:36-07:00ActiveState Code RecipesFast Indexing functions (greater than, less than, equal to, and not equal to) (Python)
2012-03-13T16:21:36-07:00Garretthttp://code.activestate.com/recipes/users/4181290/http://code.activestate.com/recipes/578071-fast-indexing-functions-greater-than-less-than-equ/
<p style="color: grey">
Python
recipe 578071
by <a href="/recipes/users/4181290/">Garrett</a>
(<a href="/recipes/tags/index/">index</a>, <a href="/recipes/tags/list/">list</a>, <a href="/recipes/tags/list_comprehension/">list_comprehension</a>, <a href="/recipes/tags/numpy/">numpy</a>, <a href="/recipes/tags/python/">python</a>).
Revision 2.
</p>
<p>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.</p>
<p>Note: these do not raise exceptions, instead they return -1 on error. You should change that if you want different behavior.</p>
Exception handling in a single line (Python)
2009-10-09T01:07:52-07:00Radek Szklarczykhttp://code.activestate.com/recipes/users/2847011/http://code.activestate.com/recipes/576872-exception-handling-in-a-single-line/
<p style="color: grey">
Python
recipe 576872
by <a href="/recipes/users/2847011/">Radek Szklarczyk</a>
(<a href="/recipes/tags/exception/">exception</a>, <a href="/recipes/tags/expression/">expression</a>, <a href="/recipes/tags/function/">function</a>, <a href="/recipes/tags/list_comprehension/">list_comprehension</a>, <a href="/recipes/tags/wrapper/">wrapper</a>).
Revision 16.
</p>
<p>The rules of <em>duck typing</em> 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.</p>