Where do I find what's all affecting my $PATH?

When I echo $PATH I get: /Library/Frameworks/Python.framework/Versions/3.5/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/arukaj/Library/Android/sdk/platform-tools/:/Applications/XAMPP/xamppfiles/bin/:/Applications/XAMPP/xamppfiles/ However, I have no idea where this stuff is coming from. When I try cat ~/.bashrc, I get PS1='\u@\h:\w\$ ' for my shell formatting. If I try cat ~/.bash_profile, I get: # Setting PATH for Python 3.5 # The original version is saved in .bash_profile.pysave PATH="/Library/Frameworks/Python.framework/Versions/3.5/bin:${PATH}" export PATH if [ -f ~/.bashrc ]; then source ~/.bashrc fi Is the PATH environmental variable being constructed before .bash_profile is read? It looks like it's appending Python onto the front of the current PATH and then exporting itself as PATH again, although I don't know why the syntax is ${PATH} here as opposed to $PATH. Anyhow, I don't know where the Android and XAMPP stuff is coming from. How do I know where to look?