pip list错误

Question

pip install --upgrade pip  也无效

------------------------------------------------------------
/usr/bin/pip run on Tue Jul  5 17:01:59 2016
adium-theme-ubuntu (0.3.4)
apt-xapian-index (0.45)
argparse (1.2.1)
beautifulsoup4 (4.3.2)
bypy (1.2.22)
chardet (2.0.1)
colorama (0.3.7)
command-not-found (0.3)
cssselect (0.9.2)
cvxopt (1.1.4)
debtagshw (0.1)
decorator (3.4.0)
defer (1.0.6)
dirspec (13.10)
Django (1.9.7)
django-tagging (0.4.3)
dnspython (1.11.1)
docutils (0.12)
duplicity (0.6.23)
enum (0.4.6)
f.lux-indicator-applet (1.1.8)
gitdb (0.6.4)
GitPython (2.0.5)
gyp (0.1)
html5lib (0.999)
httplib2 (0.8)
Jinja2 (2.8)
joblib (0.8.3)
lockfile (0.8)
lxml (3.3.3)
MarkupSafe (0.23)
matplotlib (1.3.1)
ndg-httpsclient (0.3.2)
nose (1.3.4)
numexpr (2.4)
numpy (1.8.2)
oauthlib (0.6.1)
oneconf (0.3.7.14.4.1)
openpyxl (1.7.0)
PAM (0.4.2)
pandas (0.15.0)
parameters (0.2.1)
parsel (1.0.2)
patsy (0.3.0)
pexpect (3.1)
Pillow (2.3.0)
pip (1.5.4)
piston-mini-client (0.7.5)
pyasn1 (0.1.7)
pycrypto (2.6.1)
pycups (1.9.66)
pydispatch (1.1.0)
Pygments (2.1.3)
pygobject (3.12.0)
pyOpenSSL (0.13)
pyparsing (2.0.1)
pyserial (2.6)
pysmbc (1.0.14.1)
Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/list.py", line 80, in run
    self.run_listing(options)
  File "/usr/lib/python2.7/dist-packages/pip/commands/list.py", line 142, in run_listing
    self.output_package_listing(installed_packages)
  File "/usr/lib/python2.7/dist-packages/pip/commands/list.py", line 151, in output_package_listing
    if dist_is_editable(dist):
  File "/usr/lib/python2.7/dist-packages/pip/util.py", line 366, in dist_is_editable
    req = FrozenRequirement.from_dist(dist, [])
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 286, in from_dist
    assert len(specs) == 1 and specs[0][0] == '=='
AssertionError

Answer 1

没遇到过这问题不过帮你搜索了一下错误信息

http://stackoverflow.com/questions/19460232/pip-list-crashes-with-an-assertionerror

重新安装pip吧(估计是这个问题