A general class for lazy loading expensive modules.
Expand source code
"""
A general class for lazy loading expensive modules.
"""
import importlib
class LazyLoader:
"""
A general class for lazy loading expensive modules.
Modules will only be fully loaded when any of their members are first accessed.
Parameters
----------
module_name: str
Name of the module to lazy load
Examples
--------
>>> tp = LazyLoader("tomotopy")
>>> vars(tp)
{'module_name': 'tomotopy', '_module': None}
>>> tp.__version__
'0.10.1'
>>> tp._module is None
False
"""
def __init__(self, module_name):
self.module_name = module_name
self._module = None
def __getattr__(self, item):
if self._module is None:
self._module = importlib.import_module(self.module_name)
return getattr(self._module, item)Classes
class LazyLoader (module_name)-
A general class for lazy loading expensive modules.
Modules will only be fully loaded when any of their members are first accessed.
Parameters
module_name:str- Name of the module to lazy load
Examples
>>> tp = LazyLoader("tomotopy") >>> vars(tp) {'module_name': 'tomotopy', '_module': None} >>> tp.__version__ '0.10.1' >>> tp._module is None FalseExpand source code
class LazyLoader: """ A general class for lazy loading expensive modules. Modules will only be fully loaded when any of their members are first accessed. Parameters ---------- module_name: str Name of the module to lazy load Examples -------- >>> tp = LazyLoader("tomotopy") >>> vars(tp) {'module_name': 'tomotopy', '_module': None} >>> tp.__version__ '0.10.1' >>> tp._module is None False """ def __init__(self, module_name): self.module_name = module_name self._module = None def __getattr__(self, item): if self._module is None: self._module = importlib.import_module(self.module_name) return getattr(self._module, item)