[docs]class InvalidFileError(FileNotFoundError):
"""Raised when a specified file is invalid, either non-existent or not as expected."""
pass
[docs]class ConfigError(ValueError):
pass
class DelayedImportError(object):
"""Mock module object which raises an ImportError or other user-specified error only
once the module's attributes are accesssed.
Can be used to raise ImportError only if user attempts to use optional dependencies.
"""
def __init__(self, err):
self.err = err
def __getattr__(self, name):
raise self.err