How to change case in an element inside a sublist in python?

Question

I'm new in Python and I was trying to change the case in a list of lists with mixed elements. I would like to change the fourth element in every sublist with title function The list is something like this:

records = [2011, 'FEMALE', 'HISPANIC', 'SOPHIA', 223, 3],  
 [2011, 'FEMALE', 'HISPANIC', 'SOPHIE', 12, 76],  
 [2011, 'FEMALE', 'HISPANIC', 'STACY', 10, 78],  
 [2011, 'FEMALE', 'HISPANIC', 'STELLA', 11, 77],  
.......

The result I would like to get is something like this:

records = [2011, 'FEMALE', 'HISPANIC', 'Sophia', 223, 3],  
 [2011, 'FEMALE', 'HISPANIC', 'Sophie', 12, 76],  
 [2011, 'FEMALE', 'HISPANIC', 'Stacy', 10, 78],  
 [2011, 'FEMALE', 'HISPANIC', 'Stella', 11, 77],  
.......

I was trying to do this:

     `for row in range(records):`  
      `row[3].title()`
     

but I get the following error:

TypeError: 'list' object cannot be interpreted as an integer
I would be grateful If someone could help me.

Answer 1

You were almost there!

Considering the input as:

records = [[2011, 'FEMALE', 'HISPANIC', 'SOPHIA', 223, 3],  
[2011, 'FEMALE', 'HISPANIC', 'SOPHIE', 12, 76],  
[2011, 'FEMALE', 'HISPANIC', 'STACY', 10, 78],  
[2011, 'FEMALE', 'HISPANIC', 'STELLA', 11, 77]]

You can iterate over the main list this way:

for row in records:
    row[3] = row[3].title()

Or, alternatively, you can index the for loop:

for i in range(len(records)):
    records[i][3] = records[i][3].title()

Both produces the following result:

[[2011, 'FEMALE', 'HISPANIC', 'Sophia', 223, 3],
 [2011, 'FEMALE', 'HISPANIC', 'Sophie', 12, 76],
 [2011, 'FEMALE', 'HISPANIC', 'Stacy', 10, 78],
 [2011, 'FEMALE', 'HISPANIC', 'Stella', 11, 77]]