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http://learnpythonthehardway.org/book/ex6.html
Zed seems to use %r and %s interchangeably here, is there any difference between the two? Why not just use %s all the time?
Also, I wasn't sure what to search for in the documentation to find more info on this. What are %r and %s called exactly? Formatting strings?
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The difference between %s and %r is that %s uses the str function and %r uses the repr function. You can read about the differences between str and repr in this answer, but for built-in types, the biggest difference in practice is that repr for strings includes quotes and all special characters are escaped.
%s specifically is used to perform concatenation of strings together. It allows us to format a value inside a string. It is used to incorporate another string within a string. It automatically provides type conversion from value to string.
They are used for formatting strings. %s acts a placeholder for a string while %d acts as a placeholder for a number. Their associated values are passed in via a tuple using the % operator.
%r is not a valid placeholder in the str. format() formatting operations; it only works in old-style % string formatting. It indeed converts the object to a representation through the repr() function.
They are called string formatting operations.
The difference between %s and %r is that %s uses the str function and %r uses the repr function. You can read about the differences between str and repr in this answer, but for built-in types, the biggest difference in practice is that repr for strings includes quotes and all special characters are escaped.
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