You can assign the function to a variable to give it a name. The argument list consists of a comma separated list of arguments and the expression is an arithmetic expression using these arguments. The general syntax of a lambda function is quite simple: The lambda feature was added to Python due to the demand from Lisp programmers. Lambda functions are mainly used in combination with the functions filter(), map() and reduce(). they are just needed where they have been created. These functions are throw-away functions, i.e. The lambda operator or lambda function is a way to create small anonymous functions, i.e. Some like it, others hate it and many are afraid of the lambda operator. Having both list comprehension and "Filter, map, reduce and lambda" is transgressing the Python motto "There should be one obvious way to solve a problem".List comprehension( is more evident and easier to understand.There is an equally powerful alternative to lambda, filter, map and reduce, i.e.His reasoning for dropping them is like this: Only reduce() had to go it moved into the module functools. I've not had the time to follow the most recent rounds, but I propose that we keep lambda, so as to stop wasting everybody's talent and time on an impossible quest." We can see the result: lambda, map() and filter() are still part of core Python. Enough that Guido van Rossum wrote hardly a year later: "After so many attempts to come up with an alternative for lambda, perhaps we should admit defeat. What he didn't anticipate was the rigidity of this opposition. He expected resistance from the Lisp and the scheme "folks". In his article from May 2005 "All Things Pythonic: The fate of reduce() in Python 3000", he gives his reasons for dropping lambda, map(), filter() and reduce(). If Guido van Rossum, the author of the programming language Python, had got his will, this chapter would have been missing in our tutorial.
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