Indentation in Python with Examples - freeCodeCamp

To indicate a block of code in Python, you must indent each line of the block by the same amount. The two blocks of code in our example ... Search Submityoursearchquery Forum Donate Learntocode—free3,000-hourcurriculum ItisgenerallygoodpracticeforyounottomixtabsandspaceswhencodinginPython.DoingthiscanpossiblycauseaTabError,andyourprogramwillcrash.Beconsistentwhenyoucode-chooseeithertoindentusingtabsorspacesandfollowyourchosenconventionthroughoutyourprogram.CodeBlocksandIndentationOneofthemostdistinctivefeaturesofPythonisitsuseofindentationtomarkblocksofcode.Considertheif-statementfromoursimplepassword-checkingprogram:ifpwd=='apple': print('Loggingon...') else: print('Incorrectpassword.') print('Alldone!')Thelinesprint(‘Loggingon…’)andprint(‘Incorrectpassword.’)aretwoseparatecodeblocks.Theseoneshappentobeonlyasinglelinelong,butPythonletsyouwritecodeblocksconsistingofanynumberofstatements.ToindicateablockofcodeinPython,youmustindenteachlineoftheblockbythesameamount.Thetwoblocksofcodeinourexampleif-statementarebothindentedfourspaces,whichisatypicalamountofindentationforPython.Inmostotherprogramminglanguages,indentationisusedonlytohelpmakethecodelookpretty.ButinPython,itisrequiredforindicatingwhatblockofcodeastatementbelongsto.Forinstance,thefinalprint(‘Alldone!’)isnotindented,andsoisnotpartoftheelse-block.Programmersfamiliarwithotherlanguagesoftenbristleatthethoughtthatindentationmatters:Manyprogrammerslikethefreedomtoformattheircodehowtheyplease.However,Pythonindentationrulesarequitesimple,andmostprogrammersalreadyuseindentationtomaketheircodereadable.Pythonsimplytakesthisideaonestepfurtherandgivesmeaningtotheindentation.If/elif-statementsAnif/elif-statementisageneralizedif-statementwithmorethanonecondition.Itisusedformakingcomplexdecisions.Forexample,supposeanairlinehasthefollowing“child”ticketrates:Kids2yearsoldoryoungerflyforfree,kidsolderthan2butyoungerthan13payadiscountedchildfare,andanyone13yearsorolderpaysaregularadultfare.Thefollowingprogramdetermineshowmuchapassengershouldpay:#airfare.py age=int(input('Howoldareyou?')) ifage<=2: print('free') elif2