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Python – Get first element in List of tuples

  • Last Updated : 23 Aug, 2021

In this article. we will discuss how to get the first element in the list of tuples in Python.

Create a list of tuples and display them:

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Python3




# create tuples with college
# id and name and store in a list
data=[(1,'sravan'), (2,'ojaswi'),
      (3,'bobby'), (4,'rohith'),
      (5,'gnanesh')]
  
# display data
print(data)

Output:



[(1, ‘sravan’), (2, ‘ojaswi’), (3, ‘bobby’), (4, ‘rohith’), (5, ‘gnanesh’)]

Method 1: Using iteration (for loop)

We can iterate through the entire list of tuples and get first by using the index, index-0 will give the first element in each tuple in a list.

Syntax: for var in list_of_tuple:

                      print(var[0])

Example: Here we will get the first IE student id from the list of tuples.

Python3




# create tuples with college id
# and name and store in a list
data = [(1,'sravan'), (2,'ojaswi'),
        (3,'bobby'),(4,'rohith'),
        (5,'gnanesh')]
  
# iterate using for loop
# to access first elements
for i in data:
   print(i[0])

Output:

1
2
3
4
5

Method 2: Using zip function

Zip is used to combine two or more data/data structures. Here we can use zip() function by using the index as 0 to get the first element.

Syntax: list(zip(*data))[0]



Example: Python code to access first element in List of the tuple.

Python3




# create tuples with college id
# and name and store in a list
data = [(1,'sravan'),(2,'ojaswi'),
        (3,'bobby'),(4,'rohith'),
        (5,'gnanesh')]
  
# get first element using zip
print(list(zip(*data))[0])

Output:

(1, 2, 3, 4, 5)

Method 3: Using map with itemgetter() method

Here we are using the map function along with itemgetter() method to get the first elements, here also we are using index – 0 to get the first elements. itemgetter() method is available in the operator module, so we need to import operator

Syntax: map(operator.itemgetter(0), data)

Example: Python program to access first elements.

Python3




import operator
  
# create tuples with college id
# and name and store in a list
data = [(1,'sravan'),(2,'ojaswi'),
        (3,'bobby'),(4,'rohith'),
        (5,'gnanesh')]
  
# map the data using item
# getter method with first elements
first_data = map(operator.itemgetter(0), data)
  
# display first elements
for i in first_data:
    print(i)

Output:

1
2
3
4
5

Method 4: Using map() with lambda expression

Here we are using lambda expression along with map() function, here also we are using index 0 to get the first data.

Syntax: map(lambda x: x[0], data)

Where,

  • x is an iterator to get first elements
  • data is the list of tuples data

Example: Python code to access first elements.

Python3




# create tuples with college id
# and name and store in a list
data=[(1,'sravan'),(2,'ojaswi'),
      (3,'bobby'),(4,'rohith'),
      (5,'gnanesh')]
  
# map with lambda expression to get first element
first_data = map(lambda x: x[0], data)
  
# display data
for i in first_data:
    print(i)

Output:

1
2
3
4
5



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