The %s specifier converts the object using str(), and %r converts it using repr().
For some objects such as integers, they yield the same result, but repr() is special in that (for types where this is possible) it conventionally returns a result that is valid Python syntax, which could be used to unambiguously recreate the object it represents.
Here’s an example, using a date:
>>> import datetime >>> d = datetime.date.today() >>> str(d) '2011-05-14' >>> repr(d) 'datetime.date(2011, 5, 14)'
Types for which repr() doesn’t produce Python syntax include those that point to external resources such as a file, which you can’t guarantee to recreate in a different context.
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