Feature
Format codes such as 'e', 'f', and 'g' are supported in format strings for integers in CPython, but not in RustPython
in cpython
in RustPython
>>>>> f'{5:f}'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Unknown format code 'f' for object of type 'int'
Python Documentation
https://docs.python.org/3/library/string.html#formatspec