When it is required to convert a list into matrix with the size of every row increasing by a number, the ‘//’ operator and a simple iteration is used.
Example
Below is a demonstration of the same
my_list = [42, 45, 67, 89, 99, 10, 23, 12, 31, 43, 60, 1, 0]
print("The list is :")
print(my_list)
my_key = 3
print("The value of key is ")
print(my_key)
my_result = []
for index in range(0, len(my_list) // my_key):
my_result.append(my_list[0: (index + 1) * my_key])
print("The resultant matrix is :")
print(my_result)Output
The list is : [42, 45, 67, 89, 99, 10, 23, 12, 31, 43, 60, 1, 0] The value of key is 3 The resultant matrix is : [[42, 45, 67], [42, 45, 67, 89, 99, 10], [42, 45, 67, 89, 99, 10, 23, 12, 31], [42, 45, 67, 89, 99, 10, 23, 12, 31, 43, 60, 1]]
Explanation
A list is defined and is displayed on the console.
A value for key is defined and is displayed on the console.
An empty list is created.
A simple iteration is used along with ‘//’ operator, and the element from a specific index multiplied with key.
This is appended to the empty list.
This list is displayed as output on the console.