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Python: Generate a 3D array

Python List: Exercise - 13 with Solution

Write a Python program to generate a 3*4*6 3D array whose each element is *.

Pictorial Presentation:

Python List: Generate a 3D array

Sample Solution:

Python Code:

array = [[ ['*' for col in range(6)] for col in range(4)] for row in range(3)]
print(array)

Sample Output: 

[[['*', '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*', '*'], ['*', '*', '
*', '*', '*', '*']], [['*', '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*'
, '*'], ['*', '*', '*', '*', '*', '*']], [['*', '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*', '*'], ['*'
, '*', '*', '*', '*', '*'], ['*', '*', '*', '*', '*', '*']]]

Explanation:

array = [[ ['*' for col in range(6)] for col in range(4)] for row in range(3)]

In the above code -

  • The outermost range(3) loop creates 3 outermost lists, which represent the first dimension of the 3D array.
  • The second range(4) loop creates 4 sub-lists for each outermost list, representing the second dimension.
  • The innermost range(6) loop creates 6 innermost lists for each sub-list, representing the third dimension.
  • The ' * ' character is assigned to every element of the innermost list using the list comprehension.

So, the resulting array is a 3D array of size 3x4x6, with every element initialized to the character '*'.

Finally print() function prints the said array.

Flowchart:

Flowchart: Generate a 3D array

Visualize Python code execution:

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Python Code Editor:

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Python: Tips of the Day

Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:

Example:

def tips_check_prop(fn, prop):
  return lambda obj: fn(obj[prop])
check_age = tips_check_prop(lambda x: x >= 25, 'age')
user = {'name': 'Owen', 'age': 25}

print(check_age(user))

Output:

True

 

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