Python | Convert list of tuples into list

Difficulty Level : Easy
Last Updated : 18 Feb, 2019

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)

Output:

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

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Python | Convert list of tuples into list