initial iter call is extraneous but harmless both are iteration tools and contexts list comprehensions are concise and often efficient way to perform common for loop taskcollecting the results of applying an expression to all items in an iterable object it' always possible to translate list comprehension to for loopand part of the list comprehension expression looks like the header of for loop syntactically iteration contexts in python include the for looplist comprehensionsthe map built-in functionthe in membership test expressionand the built-in functions sortedsumanyand all this category also includes the list and tuple built-insstring join methodsand sequence assignmentsall of which use the iteration protocol (see answer # to step across iterable objects one item at time the best way to read lines from text file today is to not read it explicitly at allinsteadopen the file within an iteration context tool such as for loop or list comprehensionand let the iteration tool automatically scan one line at time by running the file' next handler method on each iteration this approach is generally best in terms of coding simplicitymemory spaceand possibly execution speed requirements 'll accept any of the following as correct answersfearintimidationnice red uniformsa comfy chairand soft pillows iterations and comprehensions