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q@pţ #o :mod:`pprint` --- Data pretty printer
=====================================
.. module:: pprint
:synopsis: Data pretty printer.
.. moduleauthor:: Fred L. Drake, Jr.
.. sectionauthor:: Fred L. Drake, Jr.
**Source code:** :source:`Lib/pprint.py`
--------------
The :mod:`pprint` module provides a capability to "pretty-print" arbitrary
Python data structures in a form which can be used as input to the interpreter.
If the formatted structures include objects which are not fundamental Python
types, the representation may not be loadable. This may be the case if objects
such as files, sockets, classes, or instances are included, as well as many
other built-in objects which are not representable as Python constants.
The formatted representation keeps objects on a single line if it can, and
breaks them onto multiple lines if they don't fit within the allowed width.
Construct :class:`PrettyPrinter` objects explicitly if you need to adjust the
width constraint.
.. versionchanged:: 2.5
Dictionaries are sorted by key before the display is computed; before 2.5, a
dictionary was sorted only if its display required more than one line, although
that wasn't documented.
.. versionchanged:: 2.6
Added support for :class:`set` and :class:`frozenset`.
The :mod:`pprint` module defines one class:
.. First the implementation class:
.. class:: PrettyPrinter(indent=1, width=80, depth=None, stream=None)
Construct a :class:`PrettyPrinter` instance. This constructor understands
several keyword parameters. An output stream may be set using the *stream*
keyword; the only method used on the stream object is the file protocol's
:meth:`write` method. If not specified, the :class:`PrettyPrinter` adopts
``sys.stdout``. Three additional parameters may be used to control the
formatted representation. The keywords are *indent*, *depth*, and *width*. The
amount of indentation added for each recursive level is specified by *indent*;
the default is one. Other values can cause output to look a little odd, but can
make nesting easier to spot. The number of levels which may be printed is
controlled by *depth*; if the data structure being printed is too deep, the next
contained level is replaced by ``...``. By default, there is no constraint on
the depth of the objects being formatted. The desired output width is
constrained using the *width* parameter; the default is 80 characters. If a
structure cannot be formatted within the constrained width, a best effort will
be made.
>>> import pprint
>>> stuff = ['spam', 'eggs', 'lumberjack', 'knights', 'ni']
>>> stuff.insert(0, stuff[:])
>>> pp = pprint.PrettyPrinter(indent=4)
>>> pp.pprint(stuff)
[ ['spam', 'eggs', 'lumberjack', 'knights', 'ni'],
'spam',
'eggs',
'lumberjack',
'knights',
'ni']
>>> tup = ('spam', ('eggs', ('lumberjack', ('knights', ('ni', ('dead',
... ('parrot', ('fresh fruit',))))))))
>>> pp = pprint.PrettyPrinter(depth=6)
>>> pp.pprint(tup)
('spam', ('eggs', ('lumberjack', ('knights', ('ni', ('dead', (...)))))))
The :class:`PrettyPrinter` class supports several derivative functions:
.. function:: pformat(object, inde