Python:查找数组元素的字符之间的距离

def calculate_distance(char1, char2):
    return abs(ord(char1) - ord(char2))

def find_distances(arr):
    distances = {}
    for i in range(len(arr) - 1):
        for j in range(i + 1, len(arr)):
            distances[(arr[i], arr[j])] = calculate_distance(arr[i], arr[j])
    return distances

array = ['a', 'b', 'c', 'd']
distances = find_distances(array)
print(distances)