5.2.6 String conversions
A string conversion is an expression list enclosed in reverse (a.k.a. backward) quotes:
-
A string conversion evaluates the contained expression list and converts the resulting
object into a string according to rules specific to its type.
If the object is a string, a number, None, or a tuple, list or dictionary
containing only objects whose type is one of these, the resulting string is a valid Python
expression which can be passed to the built-in function eval()
to yield an expression with the same value (or an approximation, if floating point numbers
are involved).
(In particular, converting a string adds quotes around it and converts ``funny''
characters to escape sequences that are safe to print.)
Recursive objects (for example, lists or dictionaries that contain a reference to
themselves, directly or indirectly) use "..." to indicate
a recursive reference, and the result cannot be passed to eval()
to get an equal value (SyntaxError will be raised instead).
The built-in function repr() performs exactly the same
conversion in its argument as enclosing it in parentheses and reverse quotes does. The
built-in function str() performs a similar but more
user-friendly conversion.
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