pip install . error

[xuuyann]

Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Processing /home/hrg/toppra
Installing build dependencies ... done
Getting requirements to build wheel ... done
ERROR: Exception:
Traceback (most recent call last):
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 224, in _main
status = self.run(options, args)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/cli/req_command.py", line 180, in wrapper
return func(self, options, args)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 321, in run
reqs, check_supported_wheels=not options.target_dir
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 122, in resolve
requirements, max_rounds=try_to_avoid_resolution_too_deep,
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 445, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 310, in resolve
name, crit = self._merge_into_criterion(r, parent=None)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 169, in _merge_into_criterion
name = self._p.identify(requirement)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/provider.py", line 60, in identify
return dependency.name
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/requirements.py", line 41, in name
return self.candidate.name
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 188, in name
return self.project_name
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 182, in project_name
self._name = canonicalize_name(self.dist.project_name)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 239, in dist
self._prepare()
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 226, in _prepare
dist = self._prepare_distribution()
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 319, in _prepare_distribution
self._ireq, parallel_builds=True,
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 480, in prepare_linked_requirement
return self._prepare_linked_requirement(req, parallel_builds)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 524, in _prepare_linked_requirement
req, self.req_tracker, self.finder, self.build_isolation,
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 88, in _get_prepared_distribution
abstract_dist.prepare_distribution_metadata(finder, build_isolation)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/distributions/sdist.py", line 39, in prepare_distribution_metadata
self._setup_isolation(finder)
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_internal/distributions/sdist.py", line 97, in _setup_isolation
reqs = backend.get_requires_for_build_wheel()
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/pep517/wrappers.py", line 178, in get_requires_for_build_wheel
'config_settings': config_settings
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/pep517/wrappers.py", line 284, in _call_hook
raise BackendUnavailable(data.get('traceback', ''))
pip._vendor.pep517.wrappers.BackendUnavailable: Traceback (most recent call last):
File "/home/hrg/.local/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 86, in _build_backend
obj = import_module(mod_path)
File "/usr/local/lib/python3.7/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 953, in _find_and_load_unlocked
File "", line 219, in _call_with_frames_removed
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 677, in _load_unlocked
File "", line 728, in exec_module
File "", line 219, in _call_with_frames_removed
File "/tmp/pip-build-env-0gsrbvrz/overlay/lib/python3.7/site-packages/setuptools/init.py", line 18, in
from setuptools.dist import Distribution
File "/tmp/pip-build-env-0gsrbvrz/overlay/lib/python3.7/site-packages/setuptools/dist.py", line 32, in
from setuptools import windows_support
File "/tmp/pip-build-env-0gsrbvrz/overlay/lib/python3.7/site-packages/setuptools/windows_support.py", line 2, in
import ctypes
File "/usr/local/lib/python3.7/ctypes/init.py", line 7, in
from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'

When i execute the command “pip install .”,error occurs.
how to deal with this error?Thx!

[hungpham2511]

Interesting, do you still have this problem? A quick google yields this: https://stackoverflow.com/questions/27022373/python3-importerror-no-module-named-ctypes-when-using-value-from-module-mul

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