我正在使用virtualenv并且最近创建了一个新环境，但它列出了几个已安装的打包，尽管我还没有这样做。
以下是一个例子：
user@computer:~/Desktop$ virtualenv ENV
New python executable in ENV/bin/python
Installing setuptools, pip...done.
user@computer:~/Desktop$ cd ENV/
user@computer:~/Desktop/ENV$ ls
bin include lib local
user@computer:~/Desktop/ENV$ . bin/activate
(ENV)user@computer:~/Desktop/ENV$ pip list
Django (1.7.4)
pbr (0.10.7)
pip (6.0.7)
setuptools (12.0.5)
six (1.9.0)
stevedore (1.2.0)
virtualenv (12.0.6)
virtualenv-clone (0.2.5)
virtualenvwrapper (4.3.2)
但是，如果我停用了envionment，我会获得安装的全局包列表，而不是相同的列表。
(ENV)user@computer:~/Desktop/ENV$ deactivate
user@computer:~/Desktop/ENV$ pip list
adium-theme-ubuntu (0.3.4)
apt-xapian-index (0.45)
chardet (2.0.1)
command-not-found (0.3)
debtagshw (0.1)
defer (1.0.6)
dirspec (13.10)
Django (1.7.4)
duplicity (0.6.23)
httplib2 (0.8)
lockfile (0.8)
lxml (3.3.3)
oauthlib (0.6.1)
oneconf (0.3.7)
PAM (0.4.2)
pbr (0.10.7)
pexpect (3.1)
Pillow (2.3.0)
pip (6.0.7)
piston-mini-client (0.7.5)
psycopg2 (2.4.5)
pycrypto (2.6.1)
pycups (1.9.66)
pycurl (7.19.3)
pygobject (3.12.0)
pygpgme (0.3)
pyOpenSSL (0.13)
pyserial (2.6)
pysmbc (1.0.14.1)
python-apt (0.9.3.5ubuntu1)
python-debian (0.1.21-nmu2ubuntu2)
pyxdg (0.25)
reportlab (3.0)
requests (2.2.1)
sessioninstaller (0.0.0)
setuptools (3.3)
six (1.9.0)
software-center-aptd-plugins (0.0.0)
stevedore (1.2.0)
system-service (0.1.6)
Twisted-Core (13.2.0)
Twisted-Web (13.2.0)
unity-lens-photos (1.0)
urllib3 (1.7.1)
virtualenv (12.0.6)
virtualenv-clone (0.2.5)
virtualenvwrapper (4.3.2)
xdiagnose (3.6.3build2)
zope.interface (4.0.5)
这可能与我的python路径有关吗？