How to convert 2D list of string into 2D list of integers in Python
Question:
I have written the following code to read a csv file into a multidimensional list which is working fine. The problem arise when I created a function to calculate the total of 2D list. This is happening because the numbers are in string inside the 2D list i.e.
[[‘0’, ‘0’, ’30’, ‘2’, ’21’, ’13’, ’23’], …..,[‘8′, ’25’, ‘1’, ‘6’, ’21’, ’23’, ‘0’]].
What would be the simplest way to convert the string elements into integers in a 2D list such as
[[0, 0, 30, 2, 21, 13, 23],…..,[8, 25, 1, 6, 21, 23, 0]]
My code so far
rows = 52
cols = 7
def populate2D():
with open("rainfall.csv","r") as file:
lineArray = file.read().splitlines()
matrix = []
for line in lineArray:
matrix.append(line.split(","))
return matrix
def display(matrix):
print(matrix)
def yearly(matrix):
total = 0
for row in matrix:
for value in row:
total += value
return total
matrix = populate2D()
display(matrix)
total = yearly(matrix)
print()
print("Total rainfall for the year is " + str(total))
csv file
0,0,30,2,21,13,23
29,3,29,30,7,8,25
26,5,26,13,4,13,4
22,30,13,15,15,0,2
3,12,11,10,17,0,15
8,13,11,24,30,24,27
22,18,2,29,11,13,18
15,1,29,23,18,7,0
23,27,3,7,13,14,28
6,25,24,14,20,23,5
24,29,26,22,0,9,18
22,27,22,20,24,29,21
23,13,14,4,13,1,21
25,21,21,6,28,17,19
4,6,11,10,21,1,5
11,7,22,11,10,24,15
25,11,23,3,23,8,3
22,23,0,29,15,12,5
21,11,18,22,1,4,3
11,10,3,1,30,14,22
2,16,10,2,12,9,9
2,29,17,16,13,18,7
22,15,27,19,6,26,11
21,7,18,4,14,14,2
6,30,12,4,26,22,11
21,16,14,11,28,20,3
19,10,22,18,30,9,27
8,15,17,4,11,16,6
19,17,16,6,18,18,6
2,15,3,25,27,16,11
15,5,26,24,24,30,5
15,11,16,22,14,23,28
25,6,7,20,26,18,16
5,5,21,22,24,16,5
6,27,11,8,24,1,16
28,4,1,4,3,19,24
19,3,27,14,12,24,0
6,3,26,15,15,22,26
18,5,0,14,15,7,26
10,5,12,22,8,7,11
11,1,18,29,6,9,26
3,23,2,21,29,15,25
5,7,1,6,15,18,24
28,11,0,6,28,11,26
4,28,9,24,11,13,2
6,2,14,18,20,21,1
20,29,22,21,11,14,20
28,23,14,17,25,3,18
6,27,6,20,19,5,24
25,3,27,22,7,12,21
12,22,8,7,0,11,8
8,25,1,6,21,23,0
output
$ python rainfall.py
[['0', '0', '30', '2', '21', '13', '23'], ['29', '3', '29', '30', '7', '8', '25'], ['26', '5', '26', '13', '4', '13', '4'], ['22', '30', '13', '15', '15', '0', '2'], ['3', '12', '11', '10', '17', '0', '15'], ['8', '13', '11', '24', '30', '24', '27'], ['22', '18', '2', '29', '11', '13', '18'], ['15', '1', '29', '23', '18', '7', '0'], ['23', '27', '3', '7', '13', '14', '28'], ['6', '25', '24', '14', '20', '23', '5'], ['24', '29', '26', '22', '0', '9', '18'], ['22', '27', '22', '20', '24', '29', '21'], ['23', '13', '14', '4', '13', '1', '21'], ['25', '21', '21', '6', '28', '17', '19'], ['4', '6', '11', '10', '21', '1', '5'], ['11', '7', '22', '11', '10', '24', '15'], ['25', '11', '23', '3', '23', '8', '3'], ['22', '23', '0', '29', '15', '12', '5'], ['21', '11', '18', '22', '1', '4', '3'], ['11', '10', '3', '1', '30', '14', '22'], ['2', '16', '10', '2', '12', '9', '9'], ['2', '29', '17', '16', '13', '18', '7'], ['22', '15', '27', '19', '6', '26', '11'], ['21', '7', '18', '4', '14', '14', '2'], ['6', '30', '12', '4', '26', '22', '11'], ['21', '16', '14', '11', '28', '20', '3'], ['19', '10', '22', '18', '30', '9', '27'], ['8', '15', '17', '4', '11', '16', '6'], ['19', '17', '16', '6', '18', '18', '6'], ['2', '15', '3', '25', '27', '16', '11'], ['15', '5', '26', '24', '24', '30', '5'], ['15', '11', '16', '22', '14', '23', '28'], ['25', '6', '7', '20', '26', '18', '16'], ['5', '5', '21', '22', '24', '16', '5'], ['6', '27', '11', '8', '24', '1', '16'], ['28', '4', '1', '4', '3', '19', '24'], ['19', '3', '27', '14', '12', '24', '0'], ['6', '3', '26', '15', '15', '22', '26'], ['18', '5', '0', '14', '15', '7', '26'], ['10', '5', '12', '22', '8', '7', '11'], ['11', '1', '18', '29', '6', '9', '26'], ['3', '23', '2', '21', '29', '15', '25'], ['5', '7', '1', '6', '15', '18', '24'], ['28', '11', '0', '6', '28', '11', '26'], ['4', '28', '9', '24', '11', '13', '2'], ['6', '2', '14', '18', '20', '21', '1'], ['20', '29', '22', '21', '11', '14', '20'], ['28', '23', '14', '17', '25', '3', '18'], ['6', '27',
'6', '20', '19', '5', '24'], ['25', '3', '27', '22', '7', '12', '21'], ['12', '22', '8', '7', '0', '11', '8'], ['8', '25', '1', '6', '21', '23', '0']]
Traceback (most recent call last):
File "C:rainfall.py", line 33, in <module>
total = yearly(matrix)
File "C:rainfall.py", line 28, in yearly
total += value
TypeError: unsupported operand type(s) for +=: 'int' and 'str'
Answers:
You have to convert the array of numbers from string to int using map function when reading the numbers from the CSV
Replace
for line in lineArray:
matrix.append(line.split(","))
with
for line in lineArray:
matrix.append(list(map(int, line.split(","))))
The TypeError tells that you try to add an str and not an int to an int. You can convert your str to an int by just wrapping int(<YourString>) arrount it.
So in your code it would like this:
total = 0
for row in matrix:
for value in row:
total += int(value) # this line
return total
Also when you read from a file the data is stored in str and not int.
I have written the following code to read a csv file into a multidimensional list which is working fine. The problem arise when I created a function to calculate the total of 2D list. This is happening because the numbers are in string inside the 2D list i.e.
[[‘0’, ‘0’, ’30’, ‘2’, ’21’, ’13’, ’23’], …..,[‘8′, ’25’, ‘1’, ‘6’, ’21’, ’23’, ‘0’]].
What would be the simplest way to convert the string elements into integers in a 2D list such as
[[0, 0, 30, 2, 21, 13, 23],…..,[8, 25, 1, 6, 21, 23, 0]]
My code so far
rows = 52
cols = 7
def populate2D():
with open("rainfall.csv","r") as file:
lineArray = file.read().splitlines()
matrix = []
for line in lineArray:
matrix.append(line.split(","))
return matrix
def display(matrix):
print(matrix)
def yearly(matrix):
total = 0
for row in matrix:
for value in row:
total += value
return total
matrix = populate2D()
display(matrix)
total = yearly(matrix)
print()
print("Total rainfall for the year is " + str(total))
csv file
0,0,30,2,21,13,23
29,3,29,30,7,8,25
26,5,26,13,4,13,4
22,30,13,15,15,0,2
3,12,11,10,17,0,15
8,13,11,24,30,24,27
22,18,2,29,11,13,18
15,1,29,23,18,7,0
23,27,3,7,13,14,28
6,25,24,14,20,23,5
24,29,26,22,0,9,18
22,27,22,20,24,29,21
23,13,14,4,13,1,21
25,21,21,6,28,17,19
4,6,11,10,21,1,5
11,7,22,11,10,24,15
25,11,23,3,23,8,3
22,23,0,29,15,12,5
21,11,18,22,1,4,3
11,10,3,1,30,14,22
2,16,10,2,12,9,9
2,29,17,16,13,18,7
22,15,27,19,6,26,11
21,7,18,4,14,14,2
6,30,12,4,26,22,11
21,16,14,11,28,20,3
19,10,22,18,30,9,27
8,15,17,4,11,16,6
19,17,16,6,18,18,6
2,15,3,25,27,16,11
15,5,26,24,24,30,5
15,11,16,22,14,23,28
25,6,7,20,26,18,16
5,5,21,22,24,16,5
6,27,11,8,24,1,16
28,4,1,4,3,19,24
19,3,27,14,12,24,0
6,3,26,15,15,22,26
18,5,0,14,15,7,26
10,5,12,22,8,7,11
11,1,18,29,6,9,26
3,23,2,21,29,15,25
5,7,1,6,15,18,24
28,11,0,6,28,11,26
4,28,9,24,11,13,2
6,2,14,18,20,21,1
20,29,22,21,11,14,20
28,23,14,17,25,3,18
6,27,6,20,19,5,24
25,3,27,22,7,12,21
12,22,8,7,0,11,8
8,25,1,6,21,23,0
output
$ python rainfall.py
[['0', '0', '30', '2', '21', '13', '23'], ['29', '3', '29', '30', '7', '8', '25'], ['26', '5', '26', '13', '4', '13', '4'], ['22', '30', '13', '15', '15', '0', '2'], ['3', '12', '11', '10', '17', '0', '15'], ['8', '13', '11', '24', '30', '24', '27'], ['22', '18', '2', '29', '11', '13', '18'], ['15', '1', '29', '23', '18', '7', '0'], ['23', '27', '3', '7', '13', '14', '28'], ['6', '25', '24', '14', '20', '23', '5'], ['24', '29', '26', '22', '0', '9', '18'], ['22', '27', '22', '20', '24', '29', '21'], ['23', '13', '14', '4', '13', '1', '21'], ['25', '21', '21', '6', '28', '17', '19'], ['4', '6', '11', '10', '21', '1', '5'], ['11', '7', '22', '11', '10', '24', '15'], ['25', '11', '23', '3', '23', '8', '3'], ['22', '23', '0', '29', '15', '12', '5'], ['21', '11', '18', '22', '1', '4', '3'], ['11', '10', '3', '1', '30', '14', '22'], ['2', '16', '10', '2', '12', '9', '9'], ['2', '29', '17', '16', '13', '18', '7'], ['22', '15', '27', '19', '6', '26', '11'], ['21', '7', '18', '4', '14', '14', '2'], ['6', '30', '12', '4', '26', '22', '11'], ['21', '16', '14', '11', '28', '20', '3'], ['19', '10', '22', '18', '30', '9', '27'], ['8', '15', '17', '4', '11', '16', '6'], ['19', '17', '16', '6', '18', '18', '6'], ['2', '15', '3', '25', '27', '16', '11'], ['15', '5', '26', '24', '24', '30', '5'], ['15', '11', '16', '22', '14', '23', '28'], ['25', '6', '7', '20', '26', '18', '16'], ['5', '5', '21', '22', '24', '16', '5'], ['6', '27', '11', '8', '24', '1', '16'], ['28', '4', '1', '4', '3', '19', '24'], ['19', '3', '27', '14', '12', '24', '0'], ['6', '3', '26', '15', '15', '22', '26'], ['18', '5', '0', '14', '15', '7', '26'], ['10', '5', '12', '22', '8', '7', '11'], ['11', '1', '18', '29', '6', '9', '26'], ['3', '23', '2', '21', '29', '15', '25'], ['5', '7', '1', '6', '15', '18', '24'], ['28', '11', '0', '6', '28', '11', '26'], ['4', '28', '9', '24', '11', '13', '2'], ['6', '2', '14', '18', '20', '21', '1'], ['20', '29', '22', '21', '11', '14', '20'], ['28', '23', '14', '17', '25', '3', '18'], ['6', '27',
'6', '20', '19', '5', '24'], ['25', '3', '27', '22', '7', '12', '21'], ['12', '22', '8', '7', '0', '11', '8'], ['8', '25', '1', '6', '21', '23', '0']]
Traceback (most recent call last):
File "C:rainfall.py", line 33, in <module>
total = yearly(matrix)
File "C:rainfall.py", line 28, in yearly
total += value
TypeError: unsupported operand type(s) for +=: 'int' and 'str'
You have to convert the array of numbers from string to int using map function when reading the numbers from the CSV
Replace
for line in lineArray:
matrix.append(line.split(","))
with
for line in lineArray:
matrix.append(list(map(int, line.split(","))))
The TypeError tells that you try to add an str and not an int to an int. You can convert your str to an int by just wrapping int(<YourString>) arrount it.
So in your code it would like this:
total = 0
for row in matrix:
for value in row:
total += int(value) # this line
return total
Also when you read from a file the data is stored in str and not int.