python how to uppercase some characters in string

Question

Here is what I want to do but doesn\'t work:

mystring = \"hello world\"
toUpper = [\'a\', \'e\', \'i\', \'o\', \'u\', \'y\']
array = list(mystring)

for c in arr         


        

Answer 1

The problem is that al c is not used for anything, this is not passing by reference.

I would do so, for beginners:

mystring = "hello world"
toUpper = ['a', 'e', 'i', 'o', 'u', 'y']
array = []
for c in mystring:
    if c in toUpper:
        c = c.upper()
    array.append(c)
print(''.join(array))