Python f-string benchmarks

December 15, 2019

Python 3.6 f-strings have been shown to be the fastest string formatting method in microbenchmarks by Python core dev Raymond Hettinger in relative speed factors:

• f-string: 1.0
• concatenate string: 1.33
• join sequence of strings: 1.73
• %s formatting operator: 2.40
• .format() method: 3.62
• Template() method: 11.48

The reason for this speedy performance was described by Python core dev Serhiy Storchaka.