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dictionary having multiple keys having frozenset fails to print on iPython #148

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shahjapan opened this Issue · 2 comments

3 participants

@shahjapan
In [59]: d1 = { frozenset([1,2,3]) : [1,2,3], 'key1' : 'value1' }

In [60]: d1
Out[60]: ---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/home/.../ in ()

/usr/lib/pymodules/python2.6/IPython/Prompts.pyc in __call__(self, arg)
    550 
    551             # and now call a possibly user-defined print mechanism

--> 552             manipulated_val = self.display(arg)
    553 
    554             # user display hooks can change the variable to be stored in


/usr/lib/pymodules/python2.6/IPython/Prompts.pyc in _display(self, arg)
    576             return IPython.generics.result_display(arg)
    577         except TryNext:
--> 578             return self.shell.hooks.result_display(arg)
    579 
    580     # Assign the default display method:


/usr/lib/pymodules/python2.6/IPython/hooks.pyc in __call__(self, *args, **kw)
    139             #print "prio",prio,"cmd",cmd #dbg

    140             try:
--> 141                 ret = cmd(*args, **kw)
    142                 return ret
    143             except ipapi.TryNext, exc:

/usr/lib/pymodules/python2.6/IPython/hooks.pyc in result_display(self, arg)
    169 
    170     if self.rc.pprint:
--> 171         out = pformat(arg)
    172         if '\n' in out:
    173             # So that multi-line strings line up with the left column of


/usr/lib/python2.6/pprint.pyc in pformat(self, object)
    109     def pformat(self, object):
    110         sio = _StringIO()
--> 111         self._format(object, sio, 0, 0, {}, 0)
    112         return sio.getvalue()
    113 

/usr/lib/python2.6/pprint.pyc in _format(self, object, stream, indent, allowance, context, level)
    127             self._readable = False
    128             return
--> 129         rep = self._repr(object, context, level - 1)
    130         typ = _type(object)
    131         sepLines = _len(rep) > (self._width - 1 - indent - allowance)

/usr/lib/python2.6/pprint.pyc in _repr(self, object, context, level)
    221     def _repr(self, object, context, level):
    222         repr, readable, recursive = self.format(object, context.copy(),
--> 223                                                 self._depth, level)
    224         if not readable:
    225             self._readable = False

/usr/lib/python2.6/pprint.pyc in format(self, object, context, maxlevels, level)
    233         and whether the object represents a recursive construct.
    234         """
--> 235         return _safe_repr(object, context, maxlevels, level)
    236 
    237 

/usr/lib/python2.6/pprint.pyc in _safe_repr(object, context, maxlevels, level)
    275         level += 1
    276         saferepr = _safe_repr
--> 277         for k, v in sorted(object.items()):
    278             krepr, kreadable, krecur = saferepr(k, context, maxlevels, level)
    279             vrepr, vreadable, vrecur = saferepr(v, context, maxlevels, level)

TypeError: can only compare to a set
@rkern

This is a bug in the standard library's pprint module. Their safe_repr isn't as safe as it could be. I will note that the "pretty" extension distributed with IPython does handle this case correctly. Perhaps it should be promoted to the default pretty-printing for IPython.

Failing that, we should wrap pformat() in a try: except TypeError: block that falls back to a regular repr().

@fperez
Owner

Work around bug in pprint.pformat. Closed by a55b74a

@jtriley jtriley referenced this issue from a commit in jtriley/ipython
@fperez fperez Work around bug in pprint.pformat. Closes gh-148 a55b74a
@fperez fperez referenced this issue from a commit
Commit has since been removed from the repository and is no longer available.
@mattvonrocketstein mattvonrocketstein referenced this issue from a commit in mattvonrocketstein/ipython
@fperez fperez Work around bug in pprint.pformat. Closes gh-148 2403858
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