38 lines
1.4 KiB
Python
38 lines
1.4 KiB
Python
#!/usr/bin/env python3
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# lazy_imports.py - Lazy module importer library
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2024 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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class LazyModule:
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"""
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A proxy for a module that is loaded only when actually used
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"""
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def __init__(self, name):
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self.name = name
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self._module = None
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def __getattr__(self, attr):
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if self._module is None:
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import importlib
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self._module = importlib.import_module(self.name)
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return getattr(self._module, attr)
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# Create lazy module proxies
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yaml = LazyModule('yaml')
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click_advanced = LazyModule('click') # For advanced click features not used at startup |