rigidand subjective than it may need to be--some of its suggestions are not at all universally accepted or followed by python programmers doing real work moreoversome of the most prominent companies using python today have adopted coding standards of their own that differ pep does codify useful rule-of-thumb python knowledgethoughand it' great read for python beginnersas long as you take its recommendations as guidelinesnot gospel expression statements in pythonyou can use an expression as statementtoo--that ison line by itself but because the result of the expression won' be savedit usually makes sense to do so only if the expression does something useful as side effect expressions are commonly used as statements in two situationsfor calls to functions and methods some functions and methods do their work without returning value such functions are sometimes called procedures in other languages because they don' return values that you might be interested in retainingyou can call these functions with expression statements for printing values at the interactive prompt python echoes back the results of expressions typed at the interactive command line technicallythese are expression statementstoothey serve as shorthand for typing print statements table - lists some common expression statement forms in python calls to functions and methods are coded with zero or more argument objects (reallyexpressions that evaluate to objectsin parenthesesafter the function/method name table - common python expression statements operation interpretation spam(eggshamfunction calls spam ham(eggsmethod calls spam printing variables in the interactive interpreter print(abcsep=''printing operations in python yield * yielding expression statements the last two entries in table - are somewhat special cases--as we'll see later in this printing in python is function call usually coded on line by itselfand the yield operation in generator functions (discussed in is often coded as statement as well both are really just instances of expression statements assignmentsexpressionsand prints