# Brief tour of the standard library --- part II — Output formatting

> The reprlib module provides a version of repr customized for abbreviated displays of large or deeply nested containers >>> import reprlib >>> reprlib.repr(set('supercalifragilisticexpialidocious')) "{'a', 'c', 'd', 'e', 'f', 'g', ...}" The pprint module offers more sophisticated control over printin

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The reprlib module provides a version of repr customized for abbreviated displays of large or deeply nested containers

&gt;&gt;&gt; import reprlib &gt;&gt;&gt; reprlib.repr(set('supercalifragilisticexpialidocious')) "{'a', 'c', 'd', 'e', 'f', 'g', ...}"

The pprint module offers more sophisticated control over printing both built-in and user defined objects in a way that is readable by the interpreter. When the result is longer than one line, the "pretty printer" adds line breaks and indentation to more clearly reveal data structure

&gt;&gt;&gt; import pprint &gt;&gt;&gt; t = [[[['black', 'cyan'], 'white', ['green', 'red']], [['magenta', ... 'yellow'], 'blue']]] ... &gt;&gt;&gt; pprint.pprint(t, width=30) [[[['black', 'cyan'], 'white', ['green', 'red']], [['magenta', 'yellow'], 'blue']]]

The textwrap module formats paragraphs of text to fit a given screen width

&gt;&gt;&gt; import textwrap &gt;&gt;&gt; doc = """The wrap() method is just like fill() except that it returns ... a list of strings instead of one big string with newlines to separate ... the wrapped lines.""" ... &gt;&gt;&gt; print(textwrap.fill(doc, width=40)) The wrap() method is just like fill() except that it returns a list of strings instead of one big string with newlines to separate the wrapped lines.

The locale module accesses a database of culture specific data formats. The grouping attribute of locale's format function provides a direct way of formatting numbers with group separators

&gt;&gt;&gt; import locale &gt;&gt;&gt; locale.setlocale(locale.LC_ALL, 'English_United States.1252') 'English_United States.1252' &gt;&gt;&gt; conv = locale.localeconv() # get a mapping of conventions &gt;&gt;&gt; x = 1234567.8 &gt;&gt;&gt; locale.format_string("%d", x, grouping=True) '1,234,567' &gt;&gt;&gt; locale.format_string("%s%.f", (conv['currency_symbol'], ... conv['frac_digits'], x), grouping=True) '$1,234,567.80'

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