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"""A module providing a function for serializing JSON values with Infinity.
Python provides no way to override how json.dumps serializes
Infinity/-Infinity/NaN; if allow_nan is true, it encodes them as
Infinity/-Infinity/NaN, in violation of the JSON spec and in violation of what
JSON.parse accepts. If it's false, it throws a ValueError, Neither subclassing
JSONEncoder nor passing a function in the |default| keyword argument overrides
this.
"""
import math
def WrapSpecialFloats(obj):
"""Replaces all instances of Infinity/-Infinity/NaN with strings."""
if obj == float('inf'):
return 'Infinity'
elif obj == float('-inf'):
return '-Infinity'
elif isinstance(obj, float) and math.isnan(obj):
return 'NaN'
elif isinstance(obj, list) or isinstance(obj, tuple):
return map(WrapSpecialFloats, obj)
elif isinstance(obj, dict):
return {
WrapSpecialFloats(k): WrapSpecialFloats(v)
for k, v in obj.items()
}
else:
return obj
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