[issue5131] pprint doesn't know how to print a set or a defaultdict

[Nick Craig-Wood]

New submission from Nick Craig-Wood <nick at craig-wood.com>:

I noticed this the other day when debugging a program that neither set()
nor defaultdict() pprint() properly

Same under 3.1 and 2.5 (Not tried 2.6/2.7 but I assume it is the same)

>>> pprint(set(range(100)))
set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
91, 92, 93, 94, 95, 96, 97, 98, 99])

>>> from collections import defaultdict
>>> pprint(defaultdict(int).fromkeys(range(100)))
defaultdict(None, {0: None, 1: None, 2: None, 3: None, 4: None, 5: None,
6: None, 7: None, 8: None, 9: None, 10: None, 11: None, 12: None, 13:
None, 14: None, 15: None, 16: None, 17: None, 18: None, 19: None, 20:
None, 21: None, 22: None, 23: None, 24: None, 25: None, 26: None, 27:
None, 28: None, 29: None, 30: None, 31: None, 32: None, 33: None, 34:
None, 35: None, 36: None, 37: None, 38: None, 39: None, 40: None, 41:
None, 42: None, 43: None, 44: None, 45: None, 46: None, 47: None, 48:
None, 49: None, 50: None, 51: None, 52: None, 53: None, 54: None, 55:
None, 56: None, 57: None, 58: None, 59: None, 60: None, 61: None, 62:
None, 63: None, 64: None, 65: None, 66: None, 67: None, 68: None, 69:
None, 70: None, 71: None, 72: None, 73: None, 74: None, 75: None, 76:
None, 77: None, 78: None, 79: None, 80: None, 81: None, 82: None, 83:
None, 84: None, 85: None, 86: None, 87: None, 88: None, 89: None, 90:
None, 91: None, 92: None, 93: None, 94: None, 95: None, 96: None, 97:
None, 98: None, 99: None})
>>>

----------
components: Library (Lib)
messages: 80948
nosy: ncw
severity: normal
status: open
title: pprint doesn't know how to print a set or a defaultdict
type: feature request
versions: Python 2.5, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5131>
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