Python Tutorial 33 --- "Map, Filter & Reduce"
Python Tutorial 33 --- "Map, Filter & Reduce" Figure 1:Anonymous/Lambda Functions In Python Why are lambdas relevant to map(), filter() and reduce()? These three methods expect a function object as the first argument. This function object can be a normal or predefined function. Most of the time, functions passed to map(), filter(), and reduce() are the ones we only use once, so there's often no point in defining a named function(def function). To avoid defining a new function, we write an anonymous function/lambda function that we will only use once and never again. map(): "A map function executes certain instructions or functionality provided to it on every item of an iterable." The iterable could be a list, tuple, set, etc. It is worth noting that the output in the case of the map is also an iterable i.e., a list. It is a built-in function, so no import statement required. SYNTAX: map ( function , iterable ) Copy A map function takes two parameters: Fir...