Syntactically, they are a one-line version of a function and hence cannot contain multiple-line expressions.The lambda functions are throw-away functions, i.e., they are required where they have been created, and called anywhere in a function when required.Lambda functions can take multiple arguments but return just one value in the form of an expression.Return a + b Adding two numbers using Python lambda functions: sum = lambda a, b: a + bĬharacteristics of Lambda functions in Python: Is similar to writing a regular function in python, # a function in python defined using the keyword – def # a function in python defined using the keyword – lambda Unlike the regular way of defining python functions, where we use the keyword def, we use the lambda keyword to define a lambda function. It allows writing functions without naming them. Expression: The expression is an arithmetic expression that uses the arguments defined by the userĪ lambda function is an anonymous function, i.e., a function without a name.

Arguments: The user can define the number of arguments separated by a comma.

Here is the syntax of how we define a lambda function in python: lambda arguments: expression Every lambda function you define in python has three essentials – the keyword lambda, arguments and the expression. Lambda functions are one-liner functions. To know more about sys.argv command line argument, click here. Lambda expressions are simple, concise and easy-to-understand – even a newbie can get the lambda syntax easily. If the mention of Calculus has scared you, relax! You don’t have to master Calculus for using lambda functions. The term lambda originates from the Lambda Calculus, a form of mathematical calculus invented by Alonzo Church. The lambda function was initially introduced in the Python programming language because of the demand from LISP programmers.