The error
When you install cryptography with the command pip install cryptography --upgrade
, the following error is raised:
``` bash Downloading/unpacking cryptography from https://pypi.python.org/packages/source/c/cryptography/cryptography-1.0.tar.gz#md5=3f2608eb94dcc6e616c3cc2e182181b0 Downloading cryptography-1.0.tar.gz (331kB): 331kB downloaded Running setup.py (path:/tmp/pip_build_root/cryptography/setup.py) egg_info for package cryptography
no previously-included directories found matching 'docs/_build'
warning: no previously-included files matching '*' found under directory 'vectors'
Downloading/unpacking idna>=2.0 (from cryptography) Downloading idna-2.0-py2.py3-none-any.whl (61kB): 61kB downloaded Downloading/unpacking pyasn1>=0.1.8 (from cryptography) Downloading pyasn1-0.1.8.tar.gz (75kB): 75kB downloaded Running setup.py (path:/tmp/pip_build_root/pyasn1/setup.py) egg_info for package pyasn1
Requirement already up-to-date: six>=1.4.1 in /usr/local/lib/python2.7/dist-packages (from cryptography) Downloading/unpacking setuptools from https://pypi.python.org/packages/3.4/s/setuptools/setuptools-18.1-py2.py3-none-any.whl#md5=b6c8eae6b3636dd952e71135805ee156 (from cryptography) Downloading setuptools-18.1-py2.py3-none-any.whl (461kB): 461kB downloaded Requirement already up-to-date: enum34 in /usr/local/lib/python2.7/dist-packages (from cryptography) Downloading/unpacking ipaddress (from cryptography) Downloading ipaddress-1.0.14-py27-none-any.whl Downloading/unpacking cffi>=1.1.0 (from cryptography) Downloading cffi-1.1.2.tar.gz (326kB): 326kB downloaded Running setup.py (path:/tmp/pip_build_root/cffi/setup.py) egg_info for package cffi
Downloading/unpacking pycparser from https://pypi.python.org/packages/source/p/pycparser/pycparser-2.14.tar.gz#md5=a2bc8d28c923b4fe2b2c3b4b51a4f935 (from cffi>=1.1.0->cryptography) Downloading pycparser-2.14.tar.gz (223kB): 223kB downloaded Running setup.py (path:/tmp/pip_build_root/pycparser/setup.py) egg_info for package pycparser
warning: no previously-included files matching 'yacctab.*' found under directory 'tests'
warning: no previously-included files matching 'lextab.*' found under directory 'tests'
warning: no previously-included files matching 'yacctab.*' found under directory 'examples'
warning: no previously-included files matching 'lextab.*' found under directory 'examples'
Installing collected packages: cryptography, idna, pyasn1, setuptools, ipaddress, cffi, pycparser Found existing installation: cryptography 0.7.1 Uninstalling cryptography: Successfully uninstalled cryptography Running setup.py install for cryptography
Installed /tmp/pip_build_root/cryptography/.eggs/cffi-1.1.2-py2.7-linux-x86_64.egg
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip_build_root/cryptography/setup.py", line 307, in <module>
**keywords_with_side_effects(sys.argv)
File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 272, in __init__
_Distribution.__init__(self,attrs)
File "/usr/lib/python2.7/distutils/dist.py", line 287, in __init__
self.finalize_options()
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 327, in finalize_options
ep.load()(self, ep.name, value)
File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2355, in load
return self.resolve()
File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2361, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
ImportError: No module named setuptools_ext
Complete output from command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-X8h31p-record/install-record.txt --single-version-externally-managed --compile:
Installed /tmp/pip_build_root/cryptography/.eggs/cffi-1.1.2-py2.7-linux-x86_64.egg
Traceback (most recent call last):
File "
File "/tmp/pip_build_root/cryptography/setup.py", line 307, in
**keywords_with_side_effects(sys.argv)
File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 272, in init
_Distribution.__init__(self,attrs)
File "/usr/lib/python2.7/distutils/dist.py", line 287, in init
self.finalize_options()
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 327, in finalize_options
ep.load()(self, ep.name, value)
File "/usr/local/lib/python2.7/dist-packages/pkg_resources/init.py", line 2355, in load
return self.resolve()
File "/usr/local/lib/python2.7/dist-packages/pkg_resources/init.py", line 2361, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
ImportError: No module named setuptools_ext
Rolling back uninstall of cryptography ```
# Solution
Install and upgrade the pyhon package cffi:
bash
pip install -U cffi