QGIS python module is interfering with another python module installed at the system level -


i working qgis pisa in windows environment.i wanted upgrade scipy module of python present inside osgeo4w. installed pip osgeo4w windows command shell. closed command shell after installation , reopened it. when give pip command inside osfgeo4w windows command shell, referring pip module installed @ system level , hence getting error. don't know how correct thing. here error stack trace:

    traceback (most recent call last):     file "c:\program files (x86)\qgis pisa\apps\python27\lib\runpy.py", line 162, in _run_module_as_main "__main__", fname, loader, pkg_name)     file "c:\program files (x86)\qgis pisa\apps\python27\lib\runpy.py", line 72, in _run_code exec code in run_globals     file "c:\python27_32bit\scripts\pip.exe\__main__.py", line 5, in <module>     file "c:\program files (x86)\qgis pisa\apps\python27\lib\site-packages\pip\__init__.py", line 13, in <module>     pip.utils import get_installed_distributions, get_prog     file "c:\program files (x86)\qgis pisa\apps\python27\lib\site-packages\pip\utils\__init__.py", line 26, in <module>     pip._vendor import pkg_resources     file "c:\program files (x86)\qgis pisa\apps\python27\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 76, in <module>     __import__('pip._vendor.packaging.specifiers')     file "c:\program files (x86)\qgis pisa\apps\python27\lib\site-packages\pip\_vendor\packaging\specifiers.py", line 275, in <module>     class specifier(_individualspecifier):     file "c:\program files (x86)\qgis pisa\apps\python27\lib\site-packages\pip\_vendor\packaging\specifiers.py", line 374, in specifier     re.verbose | re.ignorecase,     file "c:\program files (x86)\qgis pisa\apps\python27\lib\re.py", line 190, in compile return _compile(pattern, flags)     file "c:\program files (x86)\qgis pisa\apps\python27\lib\re.py", line 242, in _compile raise error, v # invalid expression     sre_constants.error: nothing repeat

as can see on stacktrace, 3rd line top, code refers pip module of python installed @ system level instead of pip module installed inside qgis pisa. how can correctly run ?


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