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Python | Ways to Convert 3D List to 2D List

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List — it is a common type of data structure in Python. While we have used list and 2D list, the use of 3D list is increasing day by day, mainly in the case of web development. 
Given the 3D list, the challenge is to convert it to a 2D list. Problems of this type are encountered when working on projects or when contributing to open source. 
Here are some ways to achieve the above task.

  Input:  [[[3], [4]], [[5], [6]], [ [7], [8]]]  Output:  [[3], [4], [5], [6], [7], [8]] 

Method # 1: Using simple iteration to convert a 3D list to a 2D list.

# Python code to convert a 3D list to a 2D list

 
# Initialization input list

Input = [[[ 3 ], [ 4 ]], [[ 5 ], [ 6 ]], [[ 7 ], [ 8 ]]]

 
# Initialize the output list

Output = []

 
# Using iteration

for temp in Input :

for elem in temp:

Output.append (elem)

 
# print out

print ( "Initial 3d list is" )

print ( Input )

print ( "Converted 2d list is" )

print (Output)

Exit:

 Initial 3d list is [[[3], [4]], [[5], [6]], [[7], [8]]] Converted 2d list is [[3], [4], [5 ], [6], [7], [8]] 

Method # 2: Using a comprehension list to convert a 3D list to a 2D list

# Python code to convert a 3D list to a 2D list

  
# Initialize the input list

Input = [[[ 1 , 1 ], [ 2 , 7 ]], [[ 3 ], [ 4 ]], [[ 6 , 5 ], [ 6 ]]]

 
# Using the comprehension list

Output = [elem for twod in Input for elem in twod]

 
# printout

print ( "Initial 3d list is" )

print ( Input )

print ( " Converted 2d list is " )

print (Output)

Exit:

 Initial 3d list is [[[1, 1], [2 , 7]], [[3], [4]], [[6, 5], [6]]] Converted 2d list is [[1, 1], [2, 7], [3], [4 ], [6, 5], [6]] 

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