pip in stall error

[gdchaochao]

C:\Users\duckzheng\Documents\GitHub\pcap-analyzer [master ≡ +1 ~0 -1 !]> pip in
stall -r requirements.txt
Traceback (most recent call last):
File "C:\Python27\Scripts\pip-script.py", line 9, in
load_entry_point('pip==1.4.1', 'console_scripts', 'pip')()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 357, in load_entry
point
return get_distribution(dist).load_entry_point(group, name)
File "C:\Python27\lib\site-packages\pkg_resources.py", line 2394, in load_entr
y_point
return ep.load()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 2108, in load
entry = import(self.module_name, globals(),globals(), ['name'])
File "C:\Python27\lib\site-packages\pip_init.py", line 10, in
from pip.util import get_installed_distributions, get_prog
File "C:\Python27\lib\site-packages\pip\util.py", line 17, in
from pip.vendor.distlib import version
File "C:\Python27\lib\site-packages\pip\vendor\distlib\version.py", line 13, i
n
from .compat import string_types
File "C:\Python27\lib\site-packages\pip\vendor\distlib\compat.py", line 38, in