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Lambda functions:
lambda
keyword in Python
Syntax:
lambda argument(s): expression
eg.,
A trivial example.
def areaofcircle(radius): return math.pi * radius * radius
can be written as:
circlearea = lambda radius : math.pi * radius * radius
In this example, the lambda function accepts a lone argument radius
; and the function evaluates the lambda expression (π * radius2) to calculate the area of a circle and returns the result to caller.
In case of lambda function, the identifier "circlearea
" is assigned the function object the lambda expression creates so circlearea
can be called like any normal function. eg., circlearea(5)
Another trivial example that converts first character in each word in a list to uppercase character.
>> fullname = ["john doe", "richard roe", "janie q"] >>> fullname ['john doe', 'richard roe', 'janie q'] >>> map(lambda name : name.title(), fullname) ['John Doe', 'Richard Roe', 'Janie Q']
Labels: Python Programming Tips Lambda+Expressions Anonymous+Functions
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