我已经检查了其他答案，但我无法做到。
我首先使用virtualenv创建pipenv --three，然后执行pipenv shell来激活它。
然后我做pip install cryptography安装它，但得到了以下日志：
Collecting cryptography
Using cached cryptography-1.8.1.tar.gz
Requirement already satisfied: idna>=2.1 in /home/parth/.local/share/virtualenvs/parth/lib/python3.5/site-packages (from cryptography)
Requirement already satisfied: asn1crypto>=0.21.0 in /home/parth/.local/share/virtualenvs/parth/lib/python3.5/site-packages (from cryptography)
Requirement already satisfied: packaging in /usr/local/lib/python2.7/dist-packages (from cryptography)
Requirement already satisfied: six>=1.4.1 in /home/parth/.local/share/virtualenvs/parth/lib/python3.5/site-packages (from cryptography)
Requirement already satisfied: setuptools>=11.3 in /usr/local/lib/python2.7/dist-packages (from cryptography)
Requirement already satisfied: cffi>=1.4.1 in /usr/local/lib/python2.7/dist-packages (from cryptography)
Requirement already satisfied: pyparsing in /usr/local/lib/python2.7/dist-packages (from packaging->cryptography)
Requirement already satisfied: appdirs>=1.4.0 in /usr/local/lib/python2.7/dist-packages (from setuptools>=11.3->cryptography)
Requirement already satisfied: pycparser in /usr/local/lib/python2.7/dist-packages (from cffi>=1.4.1->cryptography)
Building wheels for collected packages: cryptography
Running setup.py bdist_wheel for cryptography ... error
Complete output from command /home/parth/.local/share/virtualenvs/parth/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-7294fe75/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmp3iwtgsr_pip-wheel- --python-tag cp35:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-7294fe75/cryptography/setup.py", line 335, in <module>
**keywords_with_side_effects(sys.argv)
File "/usr/lib/python3.5/distutils/core.py", line 108, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 320, in __init__
_Distribution.__init__(self, attrs)
File "/usr/lib/python3.5/distutils/dist.py", line 281, in __init__
self.finalize_options()
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 387, in finalize_options
ep.load()(self, ep.name, value)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 187, in cffi_modules
add_cffi_module(dist, cffi_module)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 49, in add_cffi_module
execfile(build_file_name, mod_vars)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 25, in execfile
exec(code, glob, glob)
File "src/_cffi_src/build_openssl.py", line 94, in <module>
extra_link_args=extra_link_args(compiler_type()),
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 61, in build_ffi_for_binding
extra_link_args=extra_link_args,
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 69, in build_ffi
ffi = FFI()
File "/usr/local/lib/python2.7/dist-packages/cffi/api.py", line 56, in __init__
import _cffi_backend as backend
ImportError: /usr/local/lib/python2.7/dist-packages/_cffi_backend.so: undefined symbol: _Py_ZeroStruct
----------------------------------------
Failed building wheel for cryptography
Running setup.py clean for cryptography
Complete output from command /home/parth/.local/share/virtualenvs/parth/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-7294fe75/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" clean --all:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-7294fe75/cryptography/setup.py", line 335, in <module>
**keywords_with_side_effects(sys.argv)
File "/usr/lib/python3.5/distutils/core.py", line 108, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 320, in __init__
_Distribution.__init__(self, attrs)
File "/usr/lib/python3.5/distutils/dist.py", line 281, in __init__
self.finalize_options()
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 387, in finalize_options
ep.load()(self, ep.name, value)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 187, in cffi_modules
add_cffi_module(dist, cffi_module)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 49, in add_cffi_module
execfile(build_file_name, mod_vars)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 25, in execfile
exec(code, glob, glob)
File "src/_cffi_src/build_openssl.py", line 94, in <module>
extra_link_args=extra_link_args(compiler_type()),
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 61, in build_ffi_for_binding
extra_link_args=extra_link_args,
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 69, in build_ffi
ffi = FFI()
File "/usr/local/lib/python2.7/dist-packages/cffi/api.py", line 56, in __init__
import _cffi_backend as backend
ImportError: /usr/local/lib/python2.7/dist-packages/_cffi_backend.so: undefined symbol: _Py_ZeroStruct
----------------------------------------
Failed cleaning build dir for cryptography
Failed to build cryptography
Installing collected packages: cryptography
Running setup.py install for cryptography ... error
Complete output from command /home/parth/.local/share/virtualenvs/parth/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-7294fe75/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-e2obpe52-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/parth/.local/share/virtualenvs/parth/include/site/python3.5/cryptography:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-7294fe75/cryptography/setup.py", line 335, in <module>
**keywords_with_side_effects(sys.argv)
File "/usr/lib/python3.5/distutils/core.py", line 108, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 320, in __init__
_Distribution.__init__(self, attrs)
File "/usr/lib/python3.5/distutils/dist.py", line 281, in __init__
self.finalize_options()
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 387, in finalize_options
ep.load()(self, ep.name, value)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 187, in cffi_modules
add_cffi_module(dist, cffi_module)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 49, in add_cffi_module
execfile(build_file_name, mod_vars)
File "/usr/local/lib/python2.7/dist-packages/cffi/setuptools_ext.py", line 25, in execfile
exec(code, glob, glob)
File "src/_cffi_src/build_openssl.py", line 94, in <module>
extra_link_args=extra_link_args(compiler_type()),
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 61, in build_ffi_for_binding
extra_link_args=extra_link_args,
File "/tmp/pip-build-7294fe75/cryptography/src/_cffi_src/utils.py", line 69, in build_ffi
ffi = FFI()
File "/usr/local/lib/python2.7/dist-packages/cffi/api.py", line 56, in __init__
import _cffi_backend as backend
ImportError: /usr/local/lib/python2.7/dist-packages/_cffi_backend.so: undefined symbol: _Py_ZeroStruct
----------------------------------------
由于某种原因，它正在使用
/usr/local/lib/python2.7/dist-packages/_cffi_backend.so
，即我系统的python2.7个软件包。我试过sudo apt-get install build-essential libssl-dev libffi-dev python-dev，但错误仍然存在。