Python slicing is a computationally fast way to methodically access parts of your data. In my opinion, to be even an intermediate Python programmer, it's one aspect of the language that it …

When I type python into the command line, the command prompt says python is not recognized as an internal or external command, operable program, or batch file. What should I do? Note: I …

An @ symbol at the beginning of a line is used for class and function decorators: PEP 318: Decorators Python Decorators - Python Wiki The most common Python decorators are: …

How do I check whether a file exists or not, without using the try statement?

In Java/C# you can easily step through code to trace what might be going wrong, and IDE's make this process very user friendly. Can you trace through python code in a similar fashion?

How do I pad a numeric string with zeroes to the left, so that the string has a specific length?

In Python 3, filter doesn't return a list, but a generator-like object. Finding the first occurrence If you only want the first thing that matches a condition (but you don't know what it is yet), it's fine …

@TMWP: If you're using NumPy, numpy.isnan is a superior choice, as it handles NumPy arrays. If you're not using NumPy, there's no benefit to taking a NumPy dependency and spending the …

See Python's document on sharing global variables across modules: The canonical way to share information across modules within a single program is to create a special module (often called …

The python cProfile and pstats modules offer great support for measuring time elapsed in certain functions without having to add any code around the existing functions. For example if you …