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Description
Expected Result
In cpython, when arg is not a valid format string,strftime returns arg itself.
>>> import time>>> time.strftime("%Y")'2022'>>> time.strftime("%4Y")'4Y'Actual Result
In RustPython,strftime raise panic when arg is not a valid format string
>>>>> import time>>>>> time.strftime("%Y")'2022'>>>>> time.strftime("%4Y")thread 'main' panicked at 'a Display implementation returned an error unexpectedly: Error', /rustc/4b91a6ea7258a947e59c6522cd5898e7c0a6a88f/library/alloc/src/string.rs:2490:14note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace