Installing the Python 3.5__python

one. Turn off the default virtual environment "Python-django" Enter command:

Deactivate

you can modify the. profile file to note that the following line does not allow the default to open "Python-django" the Virtual ring environment enter the ". Profile" File:

CD ~
Vim. Profile

The following line in the comment file

Source/home/vagrant/python-django/bin/activate

two. First execute the following command:

sudo apt-get install python-software-properties
sudo apt-get install Software-properties-common
sudo Add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo pip install--upgrade virtualenv

three. Install python3.5

sudo apt-get install python3.5

after the installation is successful, the default is installed under the "/usr/bin/" directory

enter "python3.5" to verify python3.5

Four. Installation Virtualenvwrapper can configure "/usr/local/bin/virtualenvwrapper.sh" to ". Profile" files so that each time you execute the source command below

sudo pip install virtualenvwrapper
source/usr/local/bin/virtualenvwrapper.sh

you have to source it before you can generate the ". Virtualenvs" file, which will enable the relevant commands of Virtualenvwrapper to take effect .

Five. Creating a python3.5 Virtual environment

sudo virtualenv-p python3.5 env35

Command Description: Use python3.5 to generate virtual environments Env35

Validation:

validation succeeded. You can configure python3.5 to enter the. profile file by using the default version at system startup :

CD ~
Vim. Profile

at the end of the file add the following line

Source/usr/env35/bin/activate

Some commands: To Activate a virtual environment: access to the virtual environment directory, Env35/bin

source./activate

To exit a virtual environment:

Deactivate

To Delete an environment:

Rmvirtualenv Env35

Six. Exceptions that may be encountered:

vagrant@precise64:/usr$ virtualenv-p python3.5 env35 Running virtualenv with interpreter/usr/bin/python3.5 Traceback (m
  OST recent call last): File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 2283, in <module> main ()  File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 938, in main never_download=options.never_download) file "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1039, in Create_environment site_packages=site_packages, Clea r=clear)) file "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1166, in Install_python mkdir (lib_dir) file "/usr/lib/python2.7/dist-packages/virtualenv.py", line 399, in mkdir os.makedirs (path) File/USR/LIB/PYTHON3.5/OS.P
    Y ", line 231, in Makedirs makedirs (head, mode, EXIST_OK) File"/usr/lib/python3.5/os.py ", line 231, in Makedirs Makedirs (head, mode, EXIST_OK) File "/usr/lib/python3.5/os.py", line 241, in Makedirs mkdir (name, mode) Permissioner ROR: [Errno] Permission Denied: ' env35 ' vagrant@precise64:/usr$ sudo virtualenv-p python3.5 env35 Running virtualenv with interpreter/usr/bin/p ython3.5 New python executable in env35/bin/python3.5 Also creating executable into Env35/bin/python Failed to import the SI Te module Traceback (most recent call last): File "/usr/env35/lib/python3.5/site.py", line, <module> Imp ORT os File "/usr/env35/lib/python3.5/os.py", line 666, on <module> from _COLLECTIONS_ABC import Mutablemappin G Importerror:no module named ' _collections_abc ' error:the executable env35/bin/python3.5 is not functioning error:it t
 Hinks sys.prefix is '/usr ' (should be '/usr/env35 ') error:virtualenv are not compatible with this system or executable

The solution to this anomaly is: Upgrade the virtualenv.

sudo pip install--upgrade virtualenv

You may encounter a situation where a package cannot be found: One workaround is to configure the source from the new:

Enter the "pip.conf" file, the contents of the file are modified to (that is, with the source of watercress):

[Global]
Index-url = http://pypi.douban.com/simple
[install]
trusted-host = pypi.douban.com