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Lists and Tuples in Python

by John Sturtz basics python

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Lists and Tuples in Python
Python | Convert a list into a tuple
Python | Convert list of tuples into list

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Watch Now This tutorial has a related video course created by the Real Python team. Watch it together with the written tutorial to deepen your understanding: Lists and Tuples in Python

Lists and tuples are arguably Python’s most versatile, useful data types. You will find them in virtually every nontrivial Python program.

Here’s what you’ll learn in this tutorial: You’ll cover the important characteristics of lists and tuples. You’ll learn how to define them and how to manipulate them. When you’re finished, you should have a good feel for when and how to use these object types in a Python program.

Take the Quiz: Test your knowledge with our interactive “Python Lists and Tuples” quiz. Upon completion you will receive a score so you can track your learning progress over time:

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Python | Convert a list into a tuple

Given a list, write a Python program to convert the given list into a tuple.

Examples:

Input : [1, 2, 3, 4] Output : (1, 2, 3, 4) Input : ['a', 'b', 'c'] Output : ('a', 'b', 'c')

Approach #1 : Using tuple(list_name).

Typecasting to tuple can be done by simply using tuple(list_name).

# Python3 program to convert a 
# list into a tuple 

def convert(list):

return tuple(list)

# Driver function 

list = [1, 2, 3, 4]

print(convert(list))

Output:

(1, 2, 3, 4)

Approach #2 :
A small variation to the above approach is to use a loop inside tuple() .

# Python3 program to convert a 
# list into a tuple 

def convert(list):

return tuple(i for i in list)

# Driver function 

list = [1, 2, 3, 4]

print(convert(list))

Output: (1, 2, 3, 4)

Approach #3 : Using (*list, )
This essentially unpacks the list l inside a tuple literal which is created due to the presence of the single comma (, ). This approach is a bit faster but suffers from readability.

# Python3 program to convert a 
# list into a tuple 

def convert(list):

return (*list, )

# Driver function 

list = [1, 2, 3, 4]

print(convert(list))

Output: (1, 2, 3, 4)

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Python | Convert list of tuples into list

Given a list of tuples, write a Python program to convert it into list.

Examples:

Input: [(11, 20), (13, 40), (55, 16)] Output:[11, 20, 13, 40, 55, 16] Input: [('Geeks', 2), ('For', 4), ('geek', '6')] Output: ['Geeks', 2, 'For', 4, 'geek', '6']

Below are methods to convert list of tuples into list.

Method #1 : Using list comprehension

# Python code to convert list of tuples into list 

# List of tuple initialization 

lt = [('Geeks', 2), ('For', 4), ('geek', '6')]

# using list comprehension 

out = [item for t in lt for item in t]

# printing output 

print(out)

Output:

['Geeks', 2, 'For', 4, 'geek', '6']

Method #2 : Using itertools

# Python code to convert list of tuple into list 

# Importing 

import itertools

# List of tuple initialization 

tuple = [(1, 2), (3, 4), (5, 6)]

# Using itertools 

out = list(itertools.chain(*tuple))

# printing output 

print(out)

Output: [1, 2, 3, 4, 5, 6]

Method #3 : Using iteration

# Python code to convert list of tuple into list 

# List of tuple initialization 

tup = [(1, 2), (3, 4), (5, 6)]

# result list initialization 

result = []

for t in tup:

for x in t:

result.append(x)

# printing output 

print(result)

Output: [1, 2, 3, 4, 5, 6]

Method #4 : Using sum

# Python code to convert list of tuple into list 

# List of tuple initialization 

tup = [(1, 2), (3, 4), (5, 6)]

# using sum function() 

out = list(sum(tup, ()))

# printing output 

print(out)

Output: [1, 2, 3, 4, 5, 6]

Method #5 : Using operator and reduce

# Python code to convert list of tuple into list 

import operator

from functools import reduce

# List of tuple initialization 

tup = [(1, 2), (3, 4), (5, 6)]

# printing output 

print(list(reduce(operator.concat, tup)))

Output: [1, 2, 3, 4, 5, 6]

Method #6 : Using lambda

# Python code to convert list of tuple into list 

# List of tuple initialization 

tup = [(1, 2), (3, 4), (5, 6)]

# Using map for 0 index 

b = map(lambda x: x[0], tup)

# Using map for 1 index 

c = map(lambda x: x[1], tup)

# converting to list 

b = list(b)

c = list(c)

# Combining output 

out = b + c

# printing output 

print(out)