A Python lambda function can only have one expression and no multiple lines.<\/p>\n
It is supposed to make it easier to create some small logic in one line instead of a whole function as it is usually done.<\/p>\n
Lambda functions are also anonymous, which means there is no need to name it.<\/p>\n
The basic syntax is very simple, just use the The general forms is:<\/p>\n Look at this example using only one parameter<\/p>\n If you want, you can also have multiple parameters.<\/p>\n You don’t need to use a variable as we did before, you can make use of parenthesis around the lambda function and another pair of parenthesis around the arguments.<\/p>\n The declaration of the function and the execution will happen in the same line.<\/p>\n The Map function applies the expression to each item in a list.<\/p>\n Let’s calculate the cubic of each number in the list.<\/p>\n The Filter function will, obviously, filter the list based on the expression.<\/p>\n Let’s filter to have only the numbers greater than 5.<\/p>\n You can also watch this content on Youtube:<\/p>\nlambda<\/code><\/code> keyword, define the parameters needed, use ":" to separate the parameters from the expression.<\/p>\nlambda arguments : expression<\/code><\/pre>\nOne parameter example<\/h3>\n
cubic = lambda number : number**3\nprint(cubic(2))\n#8<\/code><\/pre>\nMultiple parameter example<\/h3>\n
exponential = lambda multiplier, number, exponent : multiplier * number**exponent\nprint(exponential(2, 2, 3))\n#16<\/code><\/pre>\nCalling the Lambda Function directly<\/h3>\n
(lambda multiplier, number, exponent : multiplier * number**exponent)(2, 2, 3)\n#16<\/code><\/pre>\nExamples using lambda functions with other built-in functions<\/h2>\n
Map<\/h3>\n
numbers = [2, 5, 10]\ncubics = list(map(lambda number : number**3, numbers))\nprint(cubics)\n#[8, 125, 1000]<\/code><\/pre>\nFilter<\/h3>\n
numbers = [2, 5, 10]\nfiltered_list = list(filter(lambda number : number > 5, numbers))\nprint(filtered_list)\n#[10]<\/code><\/pre>\nWatch on Youtube<\/h2>\n