[PYTHON] What to do if pip install fails to install dependent libraries

environment

Python3.4.3 Windows10 64bit

What i did

$ pip install Sphinx
~~Omission~~
Collecting colorama>=0.3.5; sys_platform == "win32" (from Sphinx)
  Downloading https://files.pythonhosted.org/packages/31/cb/88c908c1be067fb6bacd3d7488ccab1a212533767b951933aac3d22648e2/colorama-0.4.2-py2.py3-none-any.whl
colorama requires Python '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*' but the running Python is 3.4.3

Installation failed. You can see from the Downloading line that colorama-0.4.2 is installed, but in the last line you can see that python3.4 is not supported.

Coping

$ pip install colorama==0.3.9

Install the Python 3.4.3 compatible version from PyPI's colorama site.

$ pip --no-cache-dir install Sphinx
~~Omission~~
Successfully installed Jinja2-2.10.3 MarkupSafe-1.1.1 Pygments-2.3.1 Sphinx-1.8.5 alabaster-0.7.12 babel-2.8.0 certifi-2019.11.28 chardet-3.0.4 docutils-0.15.2 idna-2.8 imagesize-1.2.0 packagi
ng-20.3 pyparsing-2.4.6 pytz-2019.3 requests-2.21.0 six-1.14.0 snowballstemmer-2.0.0 sphinxcontrib-websupport-1.1.2 typing-3.7.4.1 urllib3-1.24.3

I was able to install it.

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