What is lambda?
In Python, an anonymous function means that a function is without a name. As we already know the def keyword is used to define the normal functions and the lambda keyword is used to create anonymous functions. It has the following syntax:
Syntax of lambda
lambda arguments : expression
Example:
Python3
lst = list(map(lambda x: x**2, range(1, 5)))print(lst) |
Output:
[1, 4, 9, 16]
Difference between List comprehension and Lambda in Python
List comprehension is an elegant way to define and create a list in Python. We can create lists just like mathematical statements and in one line only. The syntax of list comprehension is easier to grasp.
A list comprehension generally consists of these parts :
- Output expression,
- Input sequence,
- A variable representing a member of the input sequence and
- An optional predicate part.
Syntax of list comprehension
List = [expression(i) for i in another_list if filter(i)]
Example:
Python3
lst = [x ** 2 for x in range(1, 11) if x % 2 == 1]print(lst) |
Output:
[1, 9, 25, 49, 81]
In the above example,
- x ** 2 is the expression.
- range (1, 11) is an input sequence or another list.
- x is the variable.
- if x % 2 == 1 is predicate part.