def validate_class_name(flag_value, category, modules, expected_superclass):
"""Checks that the given string matches a class of the expected type.
Args:
flag_value: A string naming the class to instantiate.
category: A string used further describe the class in error messages
(e.g. 'model', 'reader', 'loss').
modules: A list of modules to search for the given class.
expected_superclass: A class that the given class should inherit from.
Raises:
FlagsError: If the given class could not be found or if the first class
found with that name doesn't inherit from the expected superclass.
Returns:
True if a class was found that matches the given constraints.
"""
candidates = [getattr(module, flag_value, None) for module in modules]
for candidate in candidates:
if not candidate:
continue
if not issubclass(candidate, expected_superclass):
raise flags.FlagsError(
"%s '%s' doesn't inherit from %s." %
(category, flag_value, expected_superclass.__name__))
return True
raise flags.FlagsError("Unable to find %s '%s'." % (category, flag_value))
def validate_class_name(flag_value, category, modules, expected_superclass):
candidates = [getattr(module, flag_value, None) for module in modules]
for candidate in candidates:
if not candidate:
continue
if not issubclass(candidate, expected_superclass):
raise flags.FlagsError(
f"{category} '{flag_value}' doesn't inherit "\
f"from {expected_superclass.__name__}.")
return True
raise flags.FlagsError(f"Unable to find {category} '{flag_value}'.")
def validate_class_name(flag_value, category, modules, expected_superclass):
candidates = [getattr(module, flag_value, None) for module in modules]
for candidate in candidates:
if not candidate:
continue
if not issubclass(candidate, expected_superclass):
raise flags.FlagsError(
"%s '%s' doesn't inherit from %s." %
(category, flag_value, expected_superclass.__name__))
return True
raise flags.FlagsError("Unable to find %s '%s'." % (category, flag_value))