跳过python中的第一个值进行循环

Question

e = 'NewCamelCaseWord'
new_word = []

def snake_case_formatter(c, sep='-'):
    for i in list(c):
        if i.isupper():
            new_word.append(sep)
            i = i.lower()
        new_word.append(i)
    else:
        if new_word[0] == sep:
            del new_word[0]
        word = ''.join(new_word)
        return word 

Hi this is my code to change camel case function names into snake case ones. When creating this function i did it by changing the string into a list and then adding spaces into the space before an upper case letter however this also meant that there would be a space before the beginning of the word. This meant when i joined the string together using dashes as separators there would be a dash at the beginning of the function name. I fixed the issue by deleting the first character in the else function but. How can I make it so that the loop skips the first letter if it is a uppercase letter? I tried using continue like this:

def snake_case_formatter(c, sep='-'):
    for i in list(c):
        if i.isupper():
            if i[0]:
                continue
            new_word.append(sep)
            i = i.lower()
        new_word.append(i)
    else:
        word = ''.join(new_word)
        return word

however it just messed up the code. So i assume it has something to do with my indentation but I'm not sure how exactly i am supposed to format it.

EDIT: I would like to know how to use continue in order to skip adding a space before the first letter in my string instead of having to delete it afterwards

Answer 1

In for i in list(c): your variable i is the element of the list, not its index. It does not have information about the current index anymore.

i[0] is trying to access the first element of i , which probably doesn't make a lot of sense.

Python offers the function enumerate for iterating over elements together with their indices:

for index, i in enumerate(list(c))

Then index is the current index in the loop, which you can compare against 0 , for example with if index==0: .

Answer 2

Please check the below code for expected solution:

e = 'CamelCaseWord'
new_word = []

range(len(e))
def snake_case_formatter(c, sep='-'):
    for i in range(len(e)):
        if i==0 and e[i].isupper():
            continue
        elif e[i].isupper()==True:
            new_word.append('-' + e[i].lower())
        else: 
            new_word.append(e[i])
    print(''.join(new_word))

snake_case_formatter(e)