Python 3 Object-Oriented Programming - Third Edition

The format method

There are a few cases where you won't be able to use f-strings. First, you can't reuse a single template string with different variables. Second, f-strings were introduced in Python 3.6. If you're stuck on an older version of Python or need to reuse template strings, you can use the older str.format method instead. It uses the same formatting specifiers as f-strings, but can be called multiple times on one string. Here's an example:

>>> template = "abc {number:*^10d}">>> template.format(number=32)'abc ****32****'>>> template.format(number=84)'abc ****84****'

The format method behaves similarly to f-strings, but there are a couple of differences:

• It is restricted in what it can look up. You can access attributes on objects ...