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Remove the dependency on pyrsistent #645

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Remove the dependency on pyrsistent #645

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10 changes: 6 additions & 4 deletions jsonschema/_types.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
import numbers

from pyrsistent import pmap
import attr

from jsonschema.compat import int_types, str_types
Expand Down Expand Up @@ -61,7 +60,7 @@ class TypeChecker(object):

The initial mapping of types to their checking functions.
"""
_type_checkers = attr.ib(default=pmap(), converter=pmap)
_type_checkers = attr.ib(default=dict(), converter=dict)

def is_type(self, instance, type):
"""
Expand Down Expand Up @@ -131,8 +130,10 @@ def redefine_many(self, definitions=()):

A new `TypeChecker` instance.
"""
new_checkers = dict(self._type_checkers)
new_checkers.update(definitions)
return attr.evolve(
self, type_checkers=self._type_checkers.update(definitions),
self, type_checkers=new_checkers,
)

def remove(self, *types):
Expand All @@ -159,7 +160,8 @@ def remove(self, *types):
checkers = self._type_checkers
for each in types:
try:
checkers = checkers.remove(each)
checkers = dict(checkers)
checkers.pop(each)
except KeyError:
raise UndefinedTypeCheck(each)
return attr.evolve(self, type_checkers=checkers)
Expand Down
1 change: 0 additions & 1 deletion setup.cfg
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Expand Up @@ -30,7 +30,6 @@ install_requires =
attrs>=17.4.0
functools32;python_version<'3'
importlib_metadata;python_version<'3.8'
pyrsistent>=0.14.0
six>=1.11.0

[options.extras_require]
Expand Down