Anaconda after installation to use Python want to uninstall before new Python is ok?

Is the need to configure the environment variables connects with previous Python anaconda and then put the new Python uninstall?


My basic situation: 1. Before I have Python3.7 now installed the anaconda is found that the computer has Python3.4

(2) has been installed from the anaconda Rstudio now don't want to use the anaconda uninstall reshipment this way, but I very want to in order to save disk space Python3.4 unload only 3.7

3. (and it's important) I'm not sure my Python3.4 were brought by the anaconda I recently installed SPSS don't know what should pay attention to the careful?