Expert Python Programming - Third Edition

String formatting with f-strings

F-strings are one of the most beloved new Python features that came with Python 3.6. It's also one of the most controversial features of that release. The f-strings or formatted string literals that were introduced by the PEP 498 document add a new way to format strings in Python. Before Python 3.6, there were two basic ways to format strings:

• Using % formatting for example "Some string with included % value" % "other"
• Using the str.format() method for example "Some string with included {other} value".format(other="other")

Formatted string literals are denoted with the f prefix, and their syntax is closest to the str.format() method, as they use a similar markup for denoting replacement fields in the text ...