it' annoying to type the full path each time you want to start python terminalso we'll add the path to the system so you can just use the command python if you already checked the add python to path box when installingyou can skip this step open your system' control panelchoose system and securityand then choose system click advanced system settings in the window that pops upclick environment variables in the box labeled system variableslook for variable called path click edit in the box that pops upclick in the box labeled variable value and use the right arrow key to scroll all the way to the right be careful not to overwrite the existing variableif you doclick cancel and try again add semicolon and the path to your python exe file to the existing variable%systemroot%\system \system \windowspowershell\ \; :\python close your terminal window and open new one this will load the new path variable into your terminal session now when you enter python --versionyou should see the version of python you just set in your path variable you can now start python terminal session by just entering python at command prompt python keywords and built-in functions python comes with its own set of keywords and built-in functions it' important to be aware of these when you're naming variables one challenge in programming is coming up with good variable nameswhich can be anything that' reasonably short and descriptive but you can' use any of python' keywordsand you shouldn' use the name of any of python' built-in functions because you'll overwrite the functions in this section we'll list python' keywords and built-in function namesso you'll know which names to avoid python keywords each of the following keywords has specific meaningand you'll see an error if you try to use them as variable name false none true and as assert break class continue def del elif else except finally for from global if import in is lambda nonlocal not or pass raise return try while with yield installing python