系統環境：CentOS7，Python版本：2.7.5
檢查是否安裝了virtualenv
virtualenv -version
沒有顯示版本信息，說明沒有安裝virtualenv.
安裝virtualenv的作用是使用程序運行能使用虛擬環境。
[root@localhost ~]# yum install python-virtualenv
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
epel/x86_64/metalink | 5.2 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/3): extras/7/x86_64/primary_db | 130 kB 00:00:00
(2/3): epel/x86_64/updateinfo | 848 kB 00:00:10
(3/3): epel/x86_64/primary_db | 6.1 MB 00:00:17
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.ustc.edu.cn
* extras: mirrors.btte.net
* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package python-virtualenv.noarch 0:1.10.1-4.el7 will be installed
--> Processing Dependency: python-setuptools for package: python-virtualenv-1.10.1-4.el7.noarch
--> Running transaction check
---> Package python-setuptools.noarch 0:0.9.8-7.el7 will be installed
--> Processing Dependency: python-backports-ssl_match_hostname for package: python-setuptools-0.9.8-7.el7.noarch
--> Running transaction check
---> Package python-backports-ssl_match_hostname.noarch 0:3.4.0.2-4.el7 will be installed
--> Processing Dependency: python-backports for package: python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch
--> Running transaction check
---> Package python-backports.x86_64 0:1.0-8.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
========================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================
Installing:
python-virtualenv noarch 1.10.1-4.el7 base 1.2 M
Installing for dependencies:
python-backports x86_64 1.0-8.el7 base 5.8 k
python-backports-ssl_match_hostname noarch 3.4.0.2-4.el7 base 12 k
python-setuptools noarch 0.9.8-7.el7 base 397 k
Transaction Summary
========================================================================================================================================================================
Install 1 Package (+3 Dependent packages)
Total download size: 1.6 M
Installed size: 3.5 M
Is this ok [y/d/N]: y
Downloading packages:
(1/4): python-backports-1.0-8.el7.x86_64.rpm | 5.8 kB 00:00:00
(2/4): python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch.rpm | 12 kB 00:00:00
(3/4): python-setuptools-0.9.8-7.el7.noarch.rpm | 397 kB 00:00:00
python-virtualenv-1.10.1-4.el7 FAILED
http://mirrors.nju.edu.cn/centos/7.4.1708/os/x86_64/Packages/python-virtualenv-1.10.1-4.el7.noarch.rpm: [Errno 12] Timeout on http://mirrors.nju.edu.cn/centos/7.4.1708/os/x86_64/Packages/python-virtualenv-1.10.1-4.el7.noarch.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
(4/4): python-virtualenv-1.10.1-4.el7.noarch.rpm | 1.2 MB 00:00:01
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 49 kB/s | 1.6 MB 00:00:34
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python-backports-1.0-8.el7.x86_64 1/4
Installing : python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch 2/4
Installing : python-setuptools-0.9.8-7.el7.noarch 3/4
Installing : python-virtualenv-1.10.1-4.el7.noarch 4/4
Verifying : python-virtualenv-1.10.1-4.el7.noarch 1/4
Verifying : python-setuptools-0.9.8-7.el7.noarch 2/4
Verifying : python-backports-1.0-8.el7.x86_64 3/4
Verifying : python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch 4/4
Installed:
python-virtualenv.noarch 0:1.10.1-4.el7
Dependency Installed:
python-backports.x86_64 0:1.0-8.el7 python-backports-ssl_match_hostname.noarch 0:3.4.0.2-4.el7 python-setuptools.noarch 0:0.9.8-7.el7
Complete!
2.創建目錄/flask
[root@localhost ~]# cd /flask/
3.[root@localhost flask]# virtualenv venv
[root@localhost flask]# virtualenv venv
New python executable in venv/bin/python
Installing Setuptools..............................................................................................................................................................................................................................done.
Installing Pip.....................................................................................................................................................................................................................................................................................................................................done.
4.激活創建的虛擬環境
[root@localhost flask]# source venv/bin/activate
屏幕回顯出現變化
(venv)[root@localhost flask]#
5.安裝flask
(venv)[root@localhost flask]# pip install flask
Downloading/unpacking flask
Downloading Flask-0.12.2.tar.gz (548kB): 548kB downloaded
Running setup.py egg_info for package flask
warning: no previously-included files matching '*.py[co]' found anywhere in distribution
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'docs/_themes'
Downloading/unpacking Werkzeug>=0.7 (from flask)
Downloading Werkzeug-0.12.2.tar.gz (1.2MB): 1.2MB downloaded
Running setup.py egg_info for package Werkzeug
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'docs/_themes'
warning: no previously-included files matching '*.py[cdo]' found anywhere in distribution
warning: no previously-included files matching '__pycache__' found anywhere in distribution
warning: no previously-included files matching '*.so' found anywhere in distribution
warning: no previously-included files matching '*.pyd' found anywhere in distribution
Downloading/unpacking Jinja2>=2.4 (from flask)
Downloading Jinja2-2.10.tar.gz (261kB): 261kB downloaded
Running setup.py egg_info for package Jinja2
warning: no previously-included files matching '*.py[co]' found anywhere in distribution
no previously-included directories found matching 'docs/_build'
Downloading/unpacking itsdangerous>=0.21 (from flask)
Downloading itsdangerous-0.24.tar.gz (46kB): 46kB downloaded
Running setup.py egg_info for package itsdangerous
warning: no previously-included files matching '*' found under directory 'docs/_build'
Downloading/unpacking click>=2.0 (from flask)
Downloading click-6.7.tar.gz (279kB): 279kB downloaded
Running setup.py egg_info for package click
warning: no previously-included files matching '*.pyc' found under directory 'docs'
warning: no previously-included files matching '*.pyo' found under directory 'docs'
warning: no previously-included files matching '*.pyc' found under directory 'tests'
warning: no previously-included files matching '*.pyo' found under directory 'tests'
warning: no previously-included files matching '*.pyc' found under directory 'examples'
warning: no previously-included files matching '*.pyo' found under directory 'examples'
no previously-included directories found matching 'docs/_build'
Downloading/unpacking MarkupSafe>=0.23 (from Jinja2>=2.4->flask)
Downloading MarkupSafe-1.0.tar.gz
Running setup.py egg_info for package MarkupSafe
Installing collected packages: flask, Werkzeug, Jinja2, itsdangerous, click, MarkupSafe
Running setup.py install for flask
warning: no previously-included files matching '*.py[co]' found anywhere in distribution
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'docs/_themes'
Installing flask script to /flask/venv/bin
Running setup.py install for Werkzeug
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'docs/_themes'
warning: no previously-included files matching '*.py[cdo]' found anywhere in distribution
warning: no previously-included files matching '__pycache__' found anywhere in distribution
warning: no previously-included files matching '*.so' found anywhere in distribution
warning: no previously-included files matching '*.pyd' found anywhere in distribution
Running setup.py install for Jinja2
warning: no previously-included files matching '*.py[co]' found anywhere in distribution
no previously-included directories found matching 'docs/_build'
File "/flask/venv/lib/python2.7/site-packages/jinja2/asyncfilters.py", line 7
async def auto_to_seq(value):
^
SyntaxError: invalid syntax
File "/flask/venv/lib/python2.7/site-packages/jinja2/asyncsupport.py", line 22
async def concat_async(async_gen):
^
SyntaxError: invalid syntax
Running setup.py install for itsdangerous
warning: no previously-included files matching '*' found under directory 'docs/_build'
Running setup.py install for click
warning: no previously-included files matching '*.pyc' found under directory 'docs'
warning: no previously-included files matching '*.pyo' found under directory 'docs'
warning: no previously-included files matching '*.pyc' found under directory 'tests'
warning: no previously-included files matching '*.pyo' found under directory 'tests'
warning: no previously-included files matching '*.pyc' found under directory 'examples'
warning: no previously-included files matching '*.pyo' found under directory 'examples'
no previously-included directories found matching 'docs/_build'
Running setup.py install for MarkupSafe
building 'markupsafe._speedups' extension
gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c markupsafe/_speedups.c -o build/temp.linux-x86_64-2.7/markupsafe/_speedups.o
unable to execute gcc: No such file or directory
==========================================================================
WARNING: The C extension could not be compiled, speedups are not enabled.
Failure information, if any, is above.
Retrying the build without the C extension now.
==========================================================================
WARNING: The C extension could not be compiled, speedups are not enabled.
Plain-Python installation succeeded.
==========================================================================
Successfully installed flask Werkzeug Jinja2 itsdangerous click MarkupSafe
Cleaning up...
#有時間研究爲什麼會出現這麼多WARNING
6.驗證是否安裝成功。
(venv)[root@localhost flask]# python
Python 2.7.5 (default, Aug 4 2017, 00:39:18)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import flask
>>> exit()