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bpo-41718: runpy now imports pkgutil in functions (GH-24996)

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Reduce the number of modules imported by "python3 -m module".

The runpy module no longer imports at startup (in the module body),
but only in functions using it: _get_code_from_file() and run_path().
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Victor Stinner 2021-03-23 19:22:57 +01:00 • committed by GitHub
parent d72e8d4875
commit bd9154a495
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1 changed files with 2 additions and 1 deletions
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3
Lib/runpy.py
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@ -16,7 +16,6 @@ import importlib.util
import io import io
import types import types
import os import os
from pkgutil import read_code, get_importer
__all__ = [ __all__ = [
"run_module", "run_path", "run_module", "run_path",
@ -233,6 +232,7 @@ def _get_main_module_details(error=ImportError):
def _get_code_from_file(run_name, fname): def _get_code_from_file(run_name, fname):
# Check for a compiled file first # Check for a compiled file first
from pkgutil import read_code
decoded_path = os.path.abspath(os.fsdecode(fname)) decoded_path = os.path.abspath(os.fsdecode(fname))
with io.open_code(decoded_path) as f: with io.open_code(decoded_path) as f:
code = read_code(f) code = read_code(f)
@ -255,6 +255,7 @@ def run_path(path_name, init_globals=None, run_name=None):
if run_name is None: if run_name is None:
run_name = "<run_path>" run_name = "<run_path>"
pkg_name = run_name.rpartition(".")[0] pkg_name = run_name.rpartition(".")[0]
from pkgutil import get_importer
importer = get_importer(path_name) importer = get_importer(path_name)
# Trying to avoid importing imp so as to not consume the deprecation warning. # Trying to avoid importing imp so as to not consume the deprecation warning.
is_NullImporter = False is_NullImporter = False