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Python | Type casting whole List and Matrix

  • Last Updated : 30 Dec, 2020

Sometimes, while working with Python List or Matrix, we usually have a problem in which we require to get a generalized function which could perform the type casting of whole container at once. There is always a need of a mechanism code which can transform entirely the allowed change of data type for all elements in container. Let’s discuss a way in which this task can be performed.

Method : Using map() + list comprehension
This task can be performed using a map(). The transformation of a normal list can be performed using a single map function by just passing the desired data type. But when it comes to transformation of whole matrix, we need the help of list comprehension for the same.




# Python3 code to demonstrate working of
# Type casting whole List and Matrix
# using map() + list comprehension
  
# helper function to type cast list 
def cast_list(test_list, data_type):
    return list(map(data_type, test_list))
      
# helper function to type cast Matrix 
def cast_matrix(test_matrix, data_type):
    return list(map(lambda sub: list(map(data_type, sub)), test_matrix))
      
# initialize list 
test_list = [1, 4, 9, 10, 19]
  
# initialize Matrix
test_matrix = [[5, 6, 8], [8, 5, 3], [9, 10, 3]]
  
# printing original list
print("The original list is : " + str(test_list))
  
# printing original matrix
print("The original Matrix is : " + str(test_matrix))
  
# Type casting whole List and Matrix
# using map() + list comprehension
res_list = cast_list(test_list, str)
res_matrix = cast_matrix(test_matrix, str)
  
# printing result
print("The List after type casting is : " + str(res_list))
print("The Matrix after type casting is : " + str(res_matrix))
Output :
The original list is : [1, 4, 9, 10, 19]
The original Matrix is : [[5, 6, 8], [8, 5, 3], [9, 10, 3]]
The List after type casting is : ['1', '4', '9', '10', '19']
The Matrix after type casting is : [['5', '6', '8'], ['8', '5', '3'], ['9', '10', '3']]

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