This means that a goes to x and the result of 2+a (5) 'goes to' the variable y. Firstly, we call this function with f(a, 2+a). This means that the function f is expecting two values, or I should say "two objects". The function has two parameters, which are called x and y. We call the function twice in the program. It also lowers the cost for development and maintenance of the software.įunctions are known under various names in programming languages, eg as subroutines, routines, procedures, methods, or subprograms. Redundant code - repeating code in this case - should be avoided! Using functions usually enhances the comprehensibility and quality of a program. The only way to accomplish this without functions would be to reuse code by copying it and adapting it to different contexts, which would be a bad idea. So what is a function in programming? In the most general sense, a function is a structuring element in programming languages to group a bunch of statements so they can be utilized in a program more than once. This is mathematics, but we are talking about programming and Python. Such a function is computing one or more results, which are entirely determined by the parameters passed to it. A common usage of functions in computer languages is to implement mathematical functions. The concept of a function is one of the most important in mathematics.
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