New submission from John Andersen <[email protected]>:
When importing a file using importlib the id() of the object being imported is
not the same as when imported using the `import` keyword. I feel like this is a
bug. As if I have a package which is using relative imports, and then I import
all of the files in that package via importlib. issubclass and isinstance and
others no longer work when the relative imported object and then importlib
imported object are checked against each other, I assume because the id()s are
different.
$ cat > target.py <<'EOF'
class Target:
pass
EOF
$ cat > importer.py <<'EOF'
import importlib
from target import Target
spec = importlib.util.spec_from_file_location("target", "target.py")
imported_by_importlib = importlib.util.module_from_spec(spec)
spec.loader.exec_module(imported_by_importlib)
print("isinstance(imported_by_importlib.Target(), Target:",
isinstance(imported_by_importlib.Target(), Target))
print("id(Target):", id(Target))
print("id(imported_by_importlib.Target):", id(imported_by_importlib.Target))
EOF
$ python importer.py
isinstance(imported_by_importlib.Target(), Target: False
id(Target): 93824998820112
id(imported_by_importlib.Target): 93824998821056
----------
messages: 367554
nosy: pdxjohnny
priority: normal
severity: normal
status: open
title: importlib of module results in different id than when imported with
import keyword
type: behavior
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue40427>
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