如何根据键值合并两个数组(数组值)？

def merge_arrays(arr1, arr2):
    merged_dict = {}
    
    # 遍历第一个数组，将键值存储到字典中
    for item in arr1:
        key, value = item.split(':')
        if key in merged_dict:
            merged_dict[key].append(value)
        else:
            merged_dict[key] = [value]
    
    # 遍历第二个数组，合并键值到字典中
    for item in arr2:
        key, value = item.split(':')
        if key in merged_dict:
            merged_dict[key].append(value)
        else:
            merged_dict[key] = [value]
    
    # 将字典中的键值对转换为数组形式
    merged_arr = []
    for key, values in merged_dict.items():
        for value in values:
            merged_arr.append(key + ':' + value)
    
    return merged_arr

# 示例用法
arr1 = ['key1:value1', 'key2:value2']
arr2 = ['key1:value3', 'key3:value4']
result = merge_arrays(arr1, arr2)
print(result)