def check(arr):
    for i in range(len(arr)):
        if (arr[i] == 2):
            nearby_two = False
            if (i > 0):
                if arr[i - 1] == 2:
                    nearby_two = True
            if (i < len(arr) - 1):
                if arr[i + 1] == 2:
                    nearby_two = True
            if not nearby_two:
                return False
    return True

def index(x):
    word_dict = dict()
    word_list = x.split(" ")
    for idx, word in enumerate(word_list):
        if word in word_dict:
            word_dict[word].append(idx)
        else:
            word_dict[word] = [idx]
    return word_dict

if __name__ == "__main__":
    print(index("I really really love Python"))