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How-to articles, tricks, and solutions about PYTHON

How can I make a dictionary (dict) from separate lists of keys and values?

You can use the zip function to create a dictionary from separate lists of keys and values like this:

list python dictionary

How can I import a module dynamically given the full path?

You can use the importlib.import_module function to import a module dynamically given the full path to the module.

python python-module python-import

How do I install pip on macOS or OS X?

To install pip on macOS or OS X, you need to use the Terminal.

python macos installation pip

Random string generation with upper case letters and digits

Here is a simple function that generates a random string of a given length using upper case letters and digits:

string python random

How do I print to stderr in Python?

To print to stderr in Python, you can use the stderr attribute of the sys module:

python printing stderr

fatal error: Python.h: No such file or directory

It looks like you are trying to include the Python.h header file in a C or C++ program, but it is not found on your system.

python gcc python-c-api

Proper way to declare custom exceptions in modern Python?

To declare a custom exception in Python, you can create a new class that inherits from the built-in Exception class.

python exception

How do I get the row count of a Pandas DataFrame?

You can use the shape property of the DataFrame to get the number of rows and columns.

python pandas dataframe

What is the meaning of single and double underscore before an object name?

In Python, a single underscore "_" before an object name indicates that the object is meant to be private, meaning that it should not be directly accessed or modified outside of the class that it is defined in.

python oop naming-conventions identifier

Replacements for switch statement in Python?

Here are a few alternatives to using a switch statement in Python:

python switch-statement