# Python Lambda Functions

## What are lambda functions in Python?

In Python, an anonymous function is a function that is defined without a name.
While normal functions are defined using the def keyword, in Python anonymous functions are defined using the lambda keyword. Hence, anonymous functions are also called lambda functions.

## How to use lambda Functions in Python?

A lambda function in python has the following syntax.
lambda arguments: expression
* Lambda functions can have any number of arguments but only one expression.
* The expression is evaluated and returned.
* Lambda functions can be used wherever function objects are required.

## Example:1Example of a Lambda function that doubles the given value.

```# Program to show the use of lambda functions

#method:1

double = lambda x: x * 2
print(double(5))

#method:2
print((lambda x: x * 2)(5))
```

Output:

10
10
>>>

In the above program, lambda x: x * 2 is the lambda function.

Here
x is the argument and
x * 2 is the expression that gets evaluated and returned.

This function has no name. It returns a function object which is assigned to the identifier double. We can now call it as a normal function. The statement
double = lambda x: x * 2
is nearly the same as

def double(x):
return x * 2

## Example:2Python program to calculate the square of a numberSol:

```#method:1

square= lambda x: x ** 2
print(square(5))

#method:2

print((lambda x: x ** 2)(5))
```

Output:

25
25
>>>

## Example:3Python program to calculate square of a number entered by the user.Sol:

```#method:1

n=int(input("Enter any no "))
square= lambda x: x ** 2
print(square(n))

#method:2

n=int(input("Enter any no "))
print((lambda x: x ** 2)(n))
```

Output:

Enter any no 5
25
Enter any no 6
36
>>>

## Example:4Python program to calculate cube of a numberSol:

```#method:1

cube= lambda x: x ** 3
print(cube(5))

#method:2

print((lambda x: x ** 3)(5))

```

Output:

125
>>>

## Example:5Python program to calculate cube of a number entered by the user.Sol:

```#method:1

n=int(input("Enter any no "))
cube= lambda x: x ** 3
print(cube(n))

#method:2

n=int(input("Enter any no "))
print((lambda x: x ** 3)(n))
```

Output:

Enter any no 10
1000
>>>

## Example:6A lambda function that adds 10 to the number passed in as an argument, and prints the result:Sol:

```#method:1

#without user input
x = lambda a : a + 10
print(x(5))

#using user input
n=int(input("Enter any no "))
x = lambda a : a + 10
print(x(n))

#method:2

#without user input
print((lambda a : a + 10)(100))

#using user input
n=int(input("Enter any no "))
print((lambda a : a + 10)(n))

```

Output:

15
Enter any no 25
35
110
Enter any no 256
266
>>>

## Example:7A lambda function that multiplies arguments “a” and “b” and prints the result:Sol:

```#method:1

#without user input
x = lambda a, b : a * b
print(x(2, 5))

#using user input
n1=int(input("Enter 1st no "))
n2=int(input("Enter 2nd no "))
x = lambda a, b : a * b
print(x(n1, n2))

#method:2

#without user input
print((lambda a, b : a * b)(2,5))

#using user input
n1=int(input("Enter 1st no "))
n2=int(input("Enter 2nd no "))
print((lambda a, b : a * b)(n1,n2))

```

Output:

10
Enter 1st no 2
Enter 1st no 33
66
10
Enter 1st no 2
Enter 1st no 6
12
>>>

## Example:8A lambda function that calculates the sum of three arguments and prints the result:Sol:

```#method:1

#without user input
x = lambda a, b,c : a+b+c
print(x(2, 5,10))

#using user input
n1=int(input("Enter 1st no "))
n2=int(input("Enter 2nd no "))
n3=int(input("Enter 3rd no "))
x = lambda a, b,c : a + b + c
print(x(n1, n2,n3))

#method:2

#without user input
print((lambda a, b,c : a + b + c)(10,20,30))

#using user input
n1=int(input("Enter 1st no "))
n2=int(input("Enter 2nd no "))
n3=int(input("Enter 3rd no "))
print((lambda a, b,c : a + b +c)(n1,n2,n3))
```

Output:

17
Enter 1st no 2
Enter 2nd no 3
Enter 3rd no 6
11
60
Enter 1st no 10
Enter 2nd no 25
Enter 3rd no 6
41
>>>

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