9.4 The pprint Module
The pprint module
pretty-prints complicated data structures, with formatting that may
be more readable than that supplied by built-in function
repr (see Chapter 8). To
fine-tune the formatting, you can instantiate the
PrettyPrinter class supplied by module
pprint and apply detailed control, helped by
auxiliary functions also supplied by module
pprint. Most of the time, however, one of the two
main functions exposed by module pprint
suffices.
Returns a string representing the pretty-printing of
obj.
pprint(obj,stream=sys.stdout)
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Outputs the pretty-printing of obj to file
object stream, with a terminating newline.
The following statements are the same:
print pprint.pformat(x)
pprint.pprint(x)
Either of these constructs will be roughly the same as
print x in many cases,
such as when the string representation of
x fits within one line. However, with
something like
x=range(30),
print x displays
x in two lines, breaking at an arbitrary point,
while using module pprint displays
x over 30 lines, one line per item. You can use
module pprint when you prefer the
module's specific display effects to the ones of
normal string representation.
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