http://telegra.ph/Task-1-Vse-li-simvoly-v-stroke-vstrechayutsya-odin-raz-09-20

unilecs_task1.py

def checkUniqueDict(s):
    if not s:
        return False

    symbols = {}

    for c in s:
        if symbols.get(c):
            return False
        else:
            symbols[c] = True

    return True


def checkUniqueList(s):
    if not s:
        return False
    
    symbols = []

    for c in s:
        if c in symbols:
            return False
        else:
            symbols.append(c)

    return True


print("dict:")
print("abcdefg ", checkUniqueDict("abcdefg "))
print("abcafg", checkUniqueDict("abcafg"))
print(" Try ", checkUniqueDict(" Try "))
print(" ", checkUniqueDict(" "))
print("", checkUniqueDict(""))

print()

print("list:")
print("abcdefg ", checkUniqueList("abcdefg "))
print("abcafg", checkUniqueList("abcafg"))
print(" Try ", checkUniqueList(" Try "))
print(" ", checkUniqueList(" "))
print("", checkUniqueList(""))