Lists vs Generators

gistfile1.py

# Using lists
def allcombinations(starters, endings):
    result = []
    for s in starters:
        for e in endings:
            result.append(s+e)
    return result

# Using a generator
def allcombinations(starters, endings):
    for s in starters:
        for e in endings:
            yield s+e