found older version of python in my command prompt

[pranavbhardwaj773 at gmail.com]

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   Dear sir,

                 I am Pranav Bhardwaj and I am facing issue regarding python
   version. When I try to open python in my command prompt, I see there is
   very older version in it that is python 2.7.13 as a default version. I
   want to switch my default version to the latest version in my command
   prompt. Plese help me how can I do this.

    

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