Why does my fedora shows python2.7 whereas i have python 3.6 installed in windows and how do i switch it to 3.6 in fedora?

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I suggest you don't mess with your system's default Python installation. If you type python -V you should get Python 2.7.13 and python3 -V -> Python 3.6.2 . If you change your default python path some applications such as PulseAudio equalizer won't start. Always use virtual environments if you wish to experiment with Python.

I don't know if this method is correct but it worked for me:

You can temporarily change your version with the command export PATH=<your_python_path>:$PATH. For example, if you have anaconda 3 installed in your home directory you should type: export PATH=~/anaconda3/bin:$PATH. Now you'll be able to do your python 3-anaconda stuff from this terminal like starting Spyder (Spyder &) with Python 3 instead of 2. This won't mess up your default Python settings, as it temporarily (only for this particular terminal session) changes the environmental variable PATH.

Fedora 26 will ship with Python 3.6 as a link python3.

Fedora is actually transitioning all its python based tools to python 3, this effort hasn't yet been completed so python 2 is still installed by default alongside python 3 that is available through the symlink /usr/bin/python3, which currently points to /usr/bin/python3.5 in my system (F24).

i got last version installed 3.5 on my fedora .. using terminal ! :
python3.5
i hope this is what you looking for it