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from __future__ import absolute_import, division, print_function
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import sys
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import types
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PY2 = sys.version_info[0] == 2
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if PY2:
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from UserDict import IterableUserDict
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# We 'bundle' isclass instead of using inspect as importing inspect is
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# fairly expensive (order of 10-15 ms for a modern machine in 2016)
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def isclass(klass):
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return isinstance(klass, (type, types.ClassType))
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# TYPE is used in exceptions, repr(int) is different on Python 2 and 3.
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TYPE = "type"
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def iteritems(d):
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return d.iteritems()
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def iterkeys(d):
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return d.iterkeys()
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# Python 2 is bereft of a read-only dict proxy, so we make one!
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class ReadOnlyDict(IterableUserDict):
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"""
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Best-effort read-only dict wrapper.
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"""
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def __setitem__(self, key, val):
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# We gently pretend we're a Python 3 mappingproxy.
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raise TypeError("'mappingproxy' object does not support item "
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"assignment")
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def update(self, _):
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# We gently pretend we're a Python 3 mappingproxy.
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raise AttributeError("'mappingproxy' object has no attribute "
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"'update'")
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def __delitem__(self, _):
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# We gently pretend we're a Python 3 mappingproxy.
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raise TypeError("'mappingproxy' object does not support item "
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"deletion")
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def clear(self):
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# We gently pretend we're a Python 3 mappingproxy.
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raise AttributeError("'mappingproxy' object has no attribute "
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"'clear'")
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def pop(self, key, default=None):
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# We gently pretend we're a Python 3 mappingproxy.
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raise AttributeError("'mappingproxy' object has no attribute "
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"'pop'")
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def popitem(self):
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# We gently pretend we're a Python 3 mappingproxy.
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raise AttributeError("'mappingproxy' object has no attribute "
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"'popitem'")
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def setdefault(self, key, default=None):
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# We gently pretend we're a Python 3 mappingproxy.
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raise AttributeError("'mappingproxy' object has no attribute "
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"'setdefault'")
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def __repr__(self):
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# Override to be identical to the Python 3 version.
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return "mappingproxy(" + repr(self.data) + ")"
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def metadata_proxy(d):
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res = ReadOnlyDict()
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res.data.update(d) # We blocked update, so we have to do it like this.
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return res
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else:
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def isclass(klass):
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return isinstance(klass, type)
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TYPE = "class"
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def iteritems(d):
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return d.items()
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def iterkeys(d):
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return d.keys()
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def metadata_proxy(d):
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return types.MappingProxyType(dict(d))
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