practice.py

lines = """I am happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation.

Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity."""

def wrap_line(tokens):
    if len(' '.join(tokens)) <= 80:
        return ' '.join(tokens)
    for i in range(len(tokens)):
        if len(' '.join(tokens[:i+1])) > 80:
            return ' '.join(tokens[:i]) + '\n' + wrap_line(tokens[i:])


wrapped = '\n'.join([wrap_line([t for t in line.split()]) for line in lines.splitlines()])

print(wrapped)