access accumulator sum algorithm aliasing copying to avoid alternative execution and operator api key append method argument keyword list optional arithmetic operator assignment item tuple assignment statement attribute beautifulsoup binary file bisectiondebugging by body bool type boolean expression boolean operator bracket squiggly bracket operator branch break statement bug by-saiv cache case-sensitivityvariable names catch cc-by-saiv celsius central processing unit chained conditional character child class choice function class float int str class keyword close method colon comment comparable comparison string tuple comparison operator compile composition compound statement concatenation list condition conditional chained nested conditional executions conditional statement connect function consistency check constraint construct constructor continue statement contributors conversion type copy slice to avoid aliasing count method