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tmp.py
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tmp.py
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"""pytest file built from texts/brandon/2022/a-descriptor-constructor.md"""
import pytest
from phmdoctest.fixture import managenamespace
from phmdoctest.functions import _phm_compare_exact
def test_code_33_output_52(capsys, managenamespace):
AU_KM = 149597870.700
class Distance:
def __init__(self, au=None, km=None):
if au is not None:
self.au = au
elif km is not None:
self.au = km / AU_KM
@property
def km(self):
return self.au * AU_KM
d = Distance(km=217)
print('au:', d.au)
print('km:', d.km)
_phm_expected_str = """\
au: 1.4505554055322529e-06
km: 217.00000000000003
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
managenamespace(operation="update", additions=locals())
def test_code_69():
@classmethod
def from_au(cls, au):
self = cls.__new__(cls) # avoid calling __init__()
self.au = au
return self
# Caution- no assertions.
def test_code_106(managenamespace):
from functools import update_wrapper
class reify(object):
def __init__(self, method):
self.method = method
update_wrapper(self, method)
def __get__(self, instance, objtype=None):
if instance is None:
return self
value = self.method(instance)
instance.__dict__[self.__name__] = value
return value
# Caution- no assertions.
managenamespace(operation="update", additions=locals())
def test_code_127_output_149(capsys, managenamespace):
class Distance:
def __init__(self, au=None, km=None):
if au is not None:
self.au = au
elif km is not None:
self.km = km
self.au = km / AU_KM
@reify
def km(self):
return self.au * AU_KM
d = Distance(au=1.524)
print('au:', d.au)
print('km:', d.km)
print()
d = Distance(km=217)
print('au:', d.au)
print('km:', d.km)
_phm_expected_str = """\
au: 1.524
km: 227987154.9468
au: 1.4505554055322529e-06
km: 217
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
managenamespace(operation="update", additions=locals())
def test_code_194_output_201(capsys):
try:
Distance.km(217)
except Exception as e:
print(e)
_phm_expected_str = """\
'reify' object is not callable
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
def test_code_214_output_243(capsys, managenamespace):
class unit(object):
def __init__(self, method):
self.method = method
update_wrapper(self, method)
def __get__(self, instance, objtype=None):
if instance is None:
return self
value = self.method(instance)
instance.__dict__[self.__name__] = value
return value
# New code:
def __call__(self, *args):
print('type(self):', type(self))
print('args:', args)
class Distance:
# ...
@unit
def km(self):
return self.au * AU_KM
Distance.km(217)
_phm_expected_str = """\
type(self): <class 'tmp.test_code_214_output_243.<locals>.unit'>
args: (217,)
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
managenamespace(operation="update", additions=locals())
def test_code_271_output_309(capsys, managenamespace):
def unit(conversion_factor):
def wrap(method):
name = method.__name__
class unit_descriptor(object):
# These methods are the same as before:
def __init__(self, method):
self.method = method
update_wrapper(self, method)
def __get__(self, instance, objtype=None):
if instance is None:
return self
value = self.method(instance)
instance.__dict__[self.__name__] = value
return value
# This is improved:
def __call__(self, value):
print('name:', name)
print('conversion_factor:', conversion_factor)
print('value:', value)
return unit_descriptor(method)
return wrap
class Distance:
# ...
@unit(AU_KM)
def km(self):
return self.au * AU_KM
Distance.km(217)
_phm_expected_str = """\
name: km
conversion_factor: 149597870.7
value: 217
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
managenamespace(operation="update", additions=locals())
def test_code_428_output_471(capsys):
from functools import partial
def unit(conversion_factor, core_unit):
def wrap(method):
name = method.__name__
class unit_descriptor(object):
def __init__(self, method): # Same as before
self.method = method
update_wrapper(self, method)
def __get__(self, instance, objtype=None):
if instance is None: # New behavior:
return partial(constructor, objtype)
value = self.method(instance)
instance.__dict__[self.__name__] = value
return value
# New way to build a Distance:
def constructor(cls, value):
obj = cls.__new__(cls) # Make a new Distance
setattr(obj, name, value) # “Set .km to 217”
if conversion_factor is not None: # And set “.au”
value = value / conversion_factor
setattr(obj, core_unit, value)
return obj
return unit_descriptor(method)
return wrap
class Distance:
# ...
@unit(AU_KM, 'au')
def km(self):
return self.au * AU_KM
d = Distance.km(217)
print('au:', d.au)
print('km:', d.km)
_phm_expected_str = """\
au: 1.4505554055322529e-06
km: 217
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)
def test_code_516_output_552(capsys):
class unit(object):
def __init__(self, name, conversion_factor=None, core_unit=None):
self.name = name
self.conversion_factor = conversion_factor
self.core_unit = core_unit
def __get__(self, instance, objtype=None):
if instance is None: # If called as a class method:
def constructor(value): # (same as above)
obj = objtype.__new__(objtype)
setattr(obj, self.name, value)
conversion_factor = self.conversion_factor
if conversion_factor is not None:
value = value / conversion_factor
setattr(obj, self.core_unit, value)
return obj
return constructor
value = getattr(instance, self.core_unit)
value = value * self.conversion_factor
instance.__dict__[self.name] = value
return value
class Distance:
au = unit('au')
km = unit('km', AU_KM, 'au')
d = Distance.au(1.524)
print('au:', d.au)
print('km:', d.km)
print()
d = Distance.km(217)
print('au:', d.au)
print('km:', d.km)
_phm_expected_str = """\
au: 1.524
km: 227987154.9468
au: 1.4505554055322529e-06
km: 217
"""
_phm_compare_exact(a=_phm_expected_str, b=capsys.readouterr().out)