Python 3.3+importlibfunction

importlib.invalidate_caches()

reloading and caches

Clears the module finders' caches so that import can see files created after the program started.

Syntax

importlib.invalidate_caches()

The module finder remembers the contents of sys.path directories and re-reads them by the directory's modification time, which has coarse resolution. If a program writes a .py file and imports it right away, the import may miss it — ModuleNotFoundError on a file that exists. Calling this before such an import fixes it; modules already in sys.modules are not reloaded — that is reload's job.

Examples

import importlib, sys
sys.path.insert(0, '.')
try:
    import fresh_mod
except ModuleNotFoundError:
    print('ещё нет')  # → ещё нет
with open('fresh_mod.py', 'w') as f:
    f.write('A = 5\n')
importlib.invalidate_caches()  # без этого импорт может не увидеть файл
import fresh_mod
print(fresh_mod.A)  # → 5

See also

Common errors

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