我按照本教程在CentOS 5.5上安裝python2.7：
http:///2010/10/rolling-python-2-6-2-on-centos-5-3/

安裝python 2.7之后我得到了：

/opt/python2.7$ls -la
total 24
drwxr-xr-x 6 root root 4096 2011-10-01 22:32 .
drwxr-xr-x 4 root root 4096 2011-10-01 22:32 ..
drwxr-xr-x 2 root root 4096 2011-10-09 19:51 bin
drwxr-xr-x 3 root root 4096 2011-10-01 22:32 include
drwxr-xr-x 4 root root 4096 2011-10-01 23:34 lib
drwxr-xr-x 3 root root 4096 2011-10-01 22:32 share

/opt/python2.7$ls -la bin
total 88
drwxr-xr-x 2 root root  4096 2011-10-09 19:51 .
drwxr-xr-x 6 root root  4096 2011-10-01 22:32 ..
-rwxr-xr-x 1 root root   105 2011-10-01 22:32 2to3
-rwxr-xr-x 1 root root   296 2011-10-09 19:49 easy_install
-rwxr-xr-x 1 root root   304 2011-10-09 19:49 easy_install-2.7
-rwxr-xr-x 1 root root   103 2011-10-01 22:32 idle
-rwxr-xr-x 1 root root   254 2011-10-03 01:37 pip
-rwxr-xr-x 1 root root   262 2011-10-03 01:37 pip-2.7
-rwxr-xr-x 1 root root    88 2011-10-01 22:32 pydoc
-rwxr-xr-x 2 root root 11783 2011-10-01 23:34 python
-rwxr-xr-x 2 root root 11783 2011-10-01 23:34 python2.7
-rwxr-xr-x 1 root root  1628 2011-10-01 23:34 python2.7-config
lrwxrwxrwx 1 root root    16 2011-10-01 23:34 python-config -> python2.7-config
-rwxr-xr-x 1 root root 18551 2011-10-01 22:32 smtpd.py
-rwxr-xr-x 1 root root   289 2011-10-09 19:51 virtualenv

我使用/opt/python2.7/bin/virtualenv二進制文件在/ var / www / myproj / env中創(chuàng)建環(huán)境

cd /var/www/myproj 
virtualenv --no-site-packages -p /opt/python2.7/bin/python \ 
     --clear --prompt="(myproj.com) " env

激活它,并做pip安裝燒瓶. pip安裝燒瓶到env / lib / python2.7 / site-packages,它不在sys.path上

$python
Python 2.7.2 (default, Oct  1 2011, 23:29:08)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import flask
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named flask
>>> import sys
>>> sys.path
['', '/opt/python2.7/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg', 
'/opt/python2.7/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg', 
'/opt/python2.7/lib/python27.zip', '/opt/python2.7/lib/python2.7', 
'/opt/python2.7/lib/python2.7/plat-linux2', '/opt/python2.7/lib/python2.7/lib-tk', 
'/opt/python2.7/lib/python2.7/lib-old', '/opt/python2.7/lib/python2.7/lib-dynload', 
'/opt/python2.7/lib/python2.7/site-packages']

我試過相同但使用easy_install而不是pip – 相同的結(jié)果.

Flask安裝在env / lib / python2.7 / site-packages下,所以主要的問題是：不用virtualenv必須將env / lib / python2.7 / site-packages添加到python的sys路徑中嗎？如果沒有,我該做得更好：

>在運行時在python路徑上添加適當?shù)膕ite-packages目錄(例如,我的燒瓶應用程序中的sys.path.insert(0,< path to site-packages>),
>修改系統(tǒng)的PYTHONPATH或
>觸發(fā)virtualenv的after_install方法,以添加<路徑到site-packages>到python的路徑

？

更多信息：
我已添加到用戶和root的?/ .bash_profile(Ubuntu上的?/ .profile)

alias python='/opt/python2.7/bin/python'
alias python2.7='/opt/python2.7/bin/python'
PATH=$PATH:/opt/python2.7/bin

做了?/ .profile
哪個python產(chǎn)生/usr/bin/python是2.6.4(嗯……)

Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

奇怪,但如果我運行python我得到正確的版本：

$python
Python 2.7.2 (default, Oct  1 2011, 23:29:08)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.

更奇怪的是,在關注python2.7安裝教程之后,我得到了/ opt / python2.7 / bin / python上的python命令.無論如何,問題在那里,任何幫助表示贊賞.請考慮一下,我是一個Python新手, – 這可能是我在這里問的一個愚蠢的問題.

解決方法:

每當您使用Bash運行命令時,它都會緩存命令的位置.這可能就是你在這里碰到的.使用hash -r清理緩存.

請注意,您的系統(tǒng)中現(xiàn)在有三個Python：系統(tǒng)在/usr/bin中的2.6,/ opt / python2.7 / bin /中的2.7,以及env / bin中的virtualenv’s 2.7.只有最后一個安裝了燒瓶.更加確定你正在打算那個.

另外,不要亂用.bash_profile.特別是root的.bash_profile – 你不需要燒瓶的root權限,對嗎？堅持使用virtualenv,它更清潔,你的系統(tǒng)陷入困境的可能性要小得多.
(話雖如此,$PATH會被掃描第一場比賽,所以你需要導出PATH = / opt / python2.7 / bin：$PATH而不是PATH = $PATH：/opt/python2.7/bin.但是那是你下次需要改變$PATH的時候,不是現(xiàn)在.)