Adam Johnson

Posts tagged ‘python’

A Guide to Python Lambda Functions

This is a cross-post from the Scout APM blog, where I occasionally write. I also maintain the Scout Python integration.

Better Python Decorators with wrapt

This is a cross-post from the Scout APM blog, where I occasionally write. I also maintain the Scout Python integration, which uses wrapt for its Python decorators.

Why does Python raise ModuleNotFoundError when modifying Django's INSTALLED_APPS?

Imagine we are installing the third party package django-cors-headers, which I maintain. Step one in its installation process is to install the package, so we run the command:

How to Check if Python's Output Buffering Is Enabled

By default, Python buffers output to standard output (stdout) and standard error (stderr). This means that output from your code might not show up immediately, making debugging harder.

Why does Python log a SyntaxWarning saying "list indices must be integers or slices"?

Take this code, which we want to return a list of two breakfast orders:

Why does Python log a SyntaxWarning saying "assertion is always true"?

Take this code:

Why does Python log a SyntaxWarning saying "object is not subscriptable"?

Take this code:

Why does Python log a SyntaxWarning saying "object is not callable"?

Take this code, which we want to return a list of shopping items with desired quantities:

How to Unit Test a Django Form

This post is an adapted extract from my book Speed Up Your Django Tests, available now.

Avoid Hardcoding ID’s in Your Tests

This is a test anti-pattern I’ve seen creep in on many Django test suites. I know of several large projects where it became a major undertaking to undo it. The good news is it’s easy to avoid adding it when you first write your tests. 🙂

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