i am getting an error when i am using pip to install a library. full error(ex: pip install keras): Traceback (most recent call last): File "c:\program files\python35\lib\runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "c:\program files\python35\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "C:\Program Files\Python35\Scripts\pip.exe\__main__.py", line 4, in <module> File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\_internal\__init__.py", line 20, in <module> from pip._vendor.urllib3.exceptions import DependencyWarning ImportError: No module named 'pip._vendor.urllib3' when i try python -m pip install(package name ex:keras): Traceback (most recent call last): File "C:\Program Files\Python35\lib\runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "C:\Program Files\Python35\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\__main__.py", line 16, in <module> from pip._internal import main as _main # isort:skip # noqa File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\_internal\__init__.py", line 20, in <module> from pip._vendor.urllib3.exceptions import DependencyWarning ImportError: No module named 'pip._vendor.urllib3' you can reproduce it by upgrading pip, interrupting the install when it is deleting pip. please fix this issue.