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"""A pure Python implementation of import."""
__all__
=
[
'__import__'
,
'import_module'
,
'invalidate_caches'
,
'reload'
]
# Bootstrap help #####################################################
# Until bootstrapping is complete, DO NOT import any modules that attempt
# to import importlib._bootstrap (directly or indirectly). Since this
# partially initialised package would be present in sys.modules, those
# modules would get an uninitialised copy of the source version, instead
# of a fully initialised version (either the frozen one or the one
# initialised below if the frozen one is not available).
import
_imp
# Just the builtin component, NOT the full Python module
import
sys
try
:
import
_frozen_importlib
as
_bootstrap
except
ImportError
:
from
.
import
_bootstrap
_bootstrap
.
_setup
(
sys
,
_imp
)
else
:
# importlib._bootstrap is the built-in import, ensure we don't create
# a second copy of the module.
_bootstrap
.
__name__
=
'importlib._bootstrap'
_bootstrap
.
__package__
=
'importlib'
try
:
_bootstrap
.
__file__
=
__file__
.
replace
(
'__init__.py'
,
'_bootstrap.py'
)
except
NameError
:
# __file__ is not guaranteed to be defined, e.g. if this code gets
# frozen by a tool like cx_Freeze.
pass
sys
.
modules
[
'importlib._bootstrap'
]
=
_bootstrap
try
:
import
_frozen_importlib_external
as
_bootstrap_external
except
ImportError
:
from
.
import
_bootstrap_external
_bootstrap_external
.
_set_bootstrap_module
(
_bootstrap
)
_bootstrap
.
_bootstrap_external
=
_bootstrap_external
else
:
_bootstrap_external
.
__name__
=
'importlib._bootstrap_external'
_bootstrap_external
.
__package__
=
'importlib'
try
:
_bootstrap_external
.
__file__
=
__file__
.
replace
(
'__init__.py'
,
'_bootstrap_external.py'
)
except
NameError
:
# __file__ is not guaranteed to be defined, e.g. if this code gets
# frozen by a tool like cx_Freeze.
pass
sys
.
modules
[
'importlib._bootstrap_external'
]
=
_bootstrap_external
# To simplify imports in test code
_pack_uint32
=
_bootstrap_external
.
_pack_uint32
_unpack_uint32
=
_bootstrap_external
.
_unpack_uint32
# Fully bootstrapped at this point, import whatever you like, circular
# dependencies and startup overhead minimisation permitting :)
# Public API #########################################################
from
.
_bootstrap
import
__import__
def
invalidate_caches
():
"""Call the invalidate_caches() method on all meta path finders stored in
sys.meta_path (where implemented)."""
for
finder
in
sys
.
meta_path
:
if
hasattr
(
finder
,
'invalidate_caches'
):
finder
.
invalidate_caches
()
def
import_module
(
name
,
package
=
None
):
"""Import a module.
The 'package' argument is required when performing a relative import. It
specifies the package to use as the anchor point from which to resolve the
relative import to an absolute import.
"""
level
=
0
if
name
.
startswith
(
'.'
):
if
not
package
:
raise
TypeError
(
"the 'package' argument is required to perform a "
f"relative import for
{
name
!r
}
"
)
for
character
in
name
:
if
character
!=
'.'
:
break
level
+=
1
return
_bootstrap
.
_gcd_import
(
name
[
level
:],
package
,
level
)
_RELOADING
=
{}
def
reload
(
module
):
"""Reload the module and return it.
The module must have been successfully imported before.
"""
try
:
name
=
module
.
__spec__
.
name
except
AttributeError
:
try
:
name
=
module
.
__name__
except
AttributeError
:
raise
TypeError
(
"reload() argument must be a module"
)
from
None
if
sys
.
modules
.
get
(
name
)
is
not
module
:
raise
ImportError
(
f"module
{
name
}
not in sys.modules"
,
name
=
name
)
if
name
in
_RELOADING
:
return
_RELOADING
[
name
]
_RELOADING
[
name
]
=
module
try
:
parent_name
=
name
.
rpartition
(
'.'
)[
0
]
if
parent_name
:
try
:
parent
=
sys
.
modules
[
parent_name
]
except
KeyError
:
raise
ImportError
(
f"parent
{
parent_name
!r
}
not in sys.modules"
,
name
=
parent_name
)
from
None
else
:
pkgpath
=
parent
.
__path__
else
:
pkgpath
=
None
target
=
module
spec
=
module
.
__spec__
=
_bootstrap
.
_find_spec
(
name
,
pkgpath
,
target
)
if
spec
is
None
:
raise
ModuleNotFoundError
(
f"spec not found for the module
{
name
!r
}
"
,
name
=
name
)
_bootstrap
.
_exec
(
spec
,
module
)
# The module may have replaced itself in sys.modules!
return
sys
.
modules
[
name
]
finally
:
try
:
del
_RELOADING
[
name
]
except
KeyError
:
pass
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