IndexError：列表索引超出列表中间的范围

I am trying to convert one type of data into another with this script, but I have to go through it character-by-character so many lists are involved. I have to change the type of conversion halfway through, so it gets kind of funky. Around halfway through, it throws the IndexError: list index out of range at me. Here's what is going wrong:

def split(word): 
    return [char for char in word]  
def conversion(contents):
    one=len(contents)/int(2)
    if ".5" in str(one):
        one=one-float(.5)
    contents=split(contents)
    for i in range(len(contents)):
        if i == one:
            print("*************BROKEN*************")
            break
        current='{}'.format(ord(contents[i]))
        for r in current:
            print(current)
            #conversion
        contents.remove(contents[i])
    for i in range(len(contents)):
        current='{}'.format(ord(contents[i])) ##The offending line
        for r in current:
            print(current)
            #other conversion
        contents.remove(contents[i])