Lambda function or anonymous function

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Lambda function or anonymous function

What is lambda  function?


Lambda function is a function they are not declared as other function using def keyword.Rather they are created using lambda keyword.

Syntax:

 lambda argument:Expression

 Example:
sum=lambda x,y :x+y
print(sum(7,5))

#in the above code lambda function return the value of sum.
#in lambda function x,y:x+y (x,y is agreement and x+y is expression that
 #get evaluate and return)
#it return function object which assign to the identifier sum.

 lambda function have no name.
lambda function can take any number of argument.
They are one line argument and hence can not contain multiple line.
lambda function can not even access global variable.

lambda function with ordinary function


def increment(y):
     return(lambda x:x+1)(y)
# in ordinary function return lambda function.
#in lambda function x is argument,x+1 is expression
#and y is assign argument/passing argument

a=100
print("a=",a)
b=increment(a)
print(b)

pass lambda function as argument
def function(f,n,m):
    print(f(n,m))
#function(f,n,m):(takes three argument f=lambda function pass as argument,)
#(n,m= first and second argument of lambda function)

sum=lambda x,y:x+y
function(sum,10,5)

#in the above code lambda function return the value of sum.
#in lambda function x,y:x+y (x,y is agreement and x+y is
# expression that get evaluate and return)
#it return function object which assign to the identifier sum.
Q.program to print sum of n natural number using lambda function.
x=lambda:sum(range(1,n+1))
n=int(input("Enter the value of N :"))
print("Total sum=",x())


Q.program to check greater number between 3 numbers.
x=lambda a,b,c:a if a>b and a>c else b if b>c else c
a=int(input("Enter 1st number :"))
b=int(input("Enter 2nd number :"))
c=int(input("Enter 3rd  number :"))
print("Greater number is :",x(a,b,c))
Output:
Enter 1st number :12
Enter 2nd number :14
Enter 3rd  number :11

Greater number is : 14


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