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• Python Patterns - An Optimization Anecdote

  ...iter) concatenates a list of strings, placing a delimiter of choice between each two strings. Nothing stops us from concatenating a list of characters (which are just strings of length one in Python), using the empty string as delimiter. Lo and behold: import string def f6(list): return string.joinfields(map(chr, list), "") This function ran four to five times as fast as our fastest contender, f3(). Moreover, it doesn't have the quadratic behavior of the ot...

• Standard Exception Classes in Python 1.5

  ...iteration through a list in a for statement raises an IndexError at the end of the list by the list object, but the exception is caught in C and so never instantiated. What Could Break? The new design does its very best not to break old code, but there are some cases where it wasn't worth compromising the new semantics in order to avoid breaking code. In other words, some old code may break. That's why the -X switch is there; however this shouldn't be an excuse for not fixing your ...

• Python Success Stories

  ...iteration of PyDrone refactored the existing Perl code into more appropriate functions, classes, and modules while translating the code base into Python. Refactoring the Perl code without moving to Python would have produced comparable architectural results, but Python's explicit error handling and stronger type checking helped to considerably improve the code's robustness. The current version of PyDrone uses about 20 different external binaries and scripts to predict various molecular propertie...

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