Python map() Method

What is the python map() method?

The map() method will return a map object of each item in an iterable. For example, (list, tuple, etc.)

These items are sent to the map method as a parameter.

The syntax of map() method is:

map(function, iterable)

map() parameters

The map() method takes two parameters as an argument.

• function - each item of the iterable will be passed to this function.
• iterable - A sequence or iterable object which is to be mapped.

Let’s see some examples of the map() method in python.

Example 1: Working of the Python map() Method?

def myfunc(a, b):
  return a + b

x = map(myfunc, ('Tata', 'BMW', 'Audi'), ('Volkswagen', 'Porsche', 'Ford'))
print(x)

The output will be as follows.

<map object at 0x7fe0c0e9e4f0>

Since map() expects a method to be passed in, lambda methods are commonly used while working with map() methods.

A lambda method is a short method without a name. Visit this page to learn more about Python lambda methods.

Example 2: How to use the lambda method with map()?

numbers = (1, 2, 3, 4)
result = map(lambda x: x*x, numbers)
print(result)

# converting map object to set
numbersSquare = set(result)
print(numbersSquare)

The output will be as follows.

<map 0x7fafc21ccb00>
{16, 1, 4, 9}

Rules of map() method

• The map() method applies a given method to each item of an iterable and returns a list of the results.

• The returned value from the map() (map object) can then be passed to methods like list() (to create a list), set() (to create a set), and so on.