Python Lambda
Python is not inherently a functional language, but it adopted some functional concepts early on such as map(), filter(), reduce(), and the lambda operator was added to the language in January 1994.
In this tutorial, we are going to learn about these topics with some simple examples one by one. Let’s start with Python Lambda.
Python Lambda
In Python programming, lambda is like a small anonymous function. With the help of lambda keyword is used to create anonymous functions.
An anonymous function is a function without a name
Syntax
lambda arguments : expression
Any number of arguments can be takes in Lambda function, but the expression must be one.
Example of Python Lambda
add_one=lambda x: x + 1
print(add_one(1))
print((lambda x: x + 2)(1))
2
3
Description about Output
Here, x is an argument and x+1 is the expression. As we passed the 1 as the argument, so we have got 2 as the result. We can also apply the function above to an argument by surrounding both the function and its argument with parentheses ()
Example of Lambda using a simple function
def add_one(x):
return x+1
print(add_one(1))2
Function with more than one argument
Above, we passed the one argument as a lambda function argument. We can pass any number of argument as the argument, but the expression must be one.
Example of Lambda passing two arguments
# (lambda x,y: x + y)(2,3) print((lambda x,y: x + y)(2,3))
5
Suggestions:
- Try to write Python lambdas and use anonymous functions.
- One should choose wisely between lambdas or normal Python functions.
- Please avoid excessive use of lambdas.
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