## f-strings vs. str.format(): Which Python String Formatting Method Reigns Supreme?

Evaluating the Evolution of String Formatting in Python: f-strings vs. str.format()

Given the widespread use of str.format() in Python projects, concerns about its potential deprecation in favor of f-strings are understandable. However, as indicated in the PEP introducing f-strings, str.format() is here to stay.

Performance Comparison

Initial assumptions suggested that f-strings might be slower than .format(), but timeit benchmarks reveal the opposite. F-strings significantly outperform their .format() counterparts:

$ python -m timeit -s "a = 'test'" "f'formatting a string {a}'"
500000 loops, best of 5: 628 nsec per loop

$ python -m timeit "'formatting a string {a}'.format(a='test')"
100000 loops, best of 5: 2.03 usec per loop

Usage Guidelines

While f-strings provide a simplified syntax, there are situations where .format() may be more suitable. For example:

• Complex formats: .format() offers more control over formatting options, such as precision and alignment.
• Dynamic formatting: If the format string needs to be generated dynamically, .format() allows for greater flexibility.

Ultimately, the choice between f-strings and .format() depends on factors such as readability, complexity, and performance considerations. F-strings are generally preferred for simplicity, but .format() remains a valid option for scenarios requiring more granular formatting control.

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