Category Python Modules

As you split a Python project into packages, you may see a leading dot in an import and wonder which module it names. Python relative imports use those dots to resolve a name from the importing module’s package. I’ll explain…

When one Python file needs to use a function defined in another, you can put that function in a module. A Python module is a source file that another file can import. In this piece, I’ll show how to save…

To reuse a function across Python files, you can put it in one file and import that file where you need it. A Python module is a file of statements and definitions, usually with a .py extension, that another file…

Python code that calculates with calendar dates or clock times can keep those values as objects until it needs display text. The built-in datetime module provides the types and operations for that work. In this piece, I’ll show you how…

Changing a stored setting may mean reading its JSON file in Python. Python’s json module reads that file into Python values that a script can edit and save as JSON. I’ll explain how Python represents JSON data, then show how…

While checking a Python program’s output, routine updates and failures can be hard to tell apart. Python’s built-in logging package assigns messages severity levels and routes records to places such as the console or a file. I’ll show you how…

When a Python project needs a library, the first task is finding a package that fits what the code needs. pip installs Python packages from PyPI or another configured package index. This article shows how to search PyPI by purpose…

A value created in one Python run may still be useful after that run ends. Python’s pickle module turns an object into bytes that Python can reconstruct. I’ll show how to save and restore a Python value with pickle, then…