Python将字典中的键值对反转方法

应用背景（问题示例）

src:

{'1': 0, '10': 1, '100': 2, '11': 3, '12': 4, '13': 5, '14': 6, '15': 7, '16': 8, '17': 9, '18': 10, '19': 11, '2': 12, '20': 13, '21': 14, '22': 15, '23': 16, '24': 17, '25': 18, '26': 19, '27': 20, '28': 21, '29': 22, '3': 23, '30': 24, '31': 25, '32': 26, '33': 27, '34': 28, '35': 29, '36': 30, '37': 31, '38': 32, '39': 33, '4': 34, '40': 35, '41': 36, '42': 37, '43': 38, '44': 39, '45': 40, '46': 41, '47': 42, '48': 43, '49': 44, '5': 45, '50': 46, '51': 47, '52': 48, '53': 49, '54': 50, '55': 51, '56': 52, '57': 53, '58': 54, '59': 55, '6': 56, '60': 57, '61': 58, '62': 59, '63': 60, '64': 61, '65': 62, '66': 63, '67': 64, '68': 65, '69': 66, '7': 67, '70': 68, '71': 69, '72': 70, '73': 71, '74': 72, '75': 73, '76': 74, '77': 75, '78': 76, '79': 77, '8': 78, '80': 79, '81': 80, '82': 81, '83': 82, '84': 83, '85': 84, '86': 85, '87': 86, '88': 87, '89': 88, '9': 89, '90': 90, '91': 91, '92': 92, '93': 93, '94': 94, '95': 95, '96': 96, '97': 97, '98': 98, '99': 99}

dst:

{0: '1', 1: '10', 2: '100', 3: '11', 4: '12', 5: '13', 6: '14', 7: '15', 8: '16', 9: '17', 10: '18', 11: '19', 12: '2', 13: '20', 14: '21', 15: '22', 16: '23', 17: '24', 18: '25', 19: '26', 20: '27', 21: '28', 22: '29', 23: '3', 24: '30', 25: '31', 26: '32', 27: '33', 28: '34', 29: '35', 30: '36', 31: '37', 32: '38', 33: '39', 34: '4', 35: '40', 36: '41', 37: '42', 38: '43', 39: '44', 40: '45', 41: '46', 42: '47', 43: '48', 44: '49', 45: '5', 46: '50', 47: '51', 48: '52', 49: '53', 50: '54', 51: '55', 52: '56', 53: '57', 54: '58', 55: '59', 56: '6', 57: '60', 58: '61', 59: '62', 60: '63', 61: '64', 62: '65', 63: '66', 64: '67', 65: '68', 66: '69', 67: '7', 68: '70', 69: '71', 70: '72', 71: '73', 72: '74', 73: '75', 74: '76', 75: '77', 76: '78', 77: '79', 78: '8', 79: '80', 80: '81', 81: '82', 82: '83', 83: '84', 84: '85', 85: '86', 86: '87', 87: '88', 88: '89', 89: '9', 90: '90', 91: '91', 92: '92', 93: '93', 94: '94', 95: '95', 96: '96', 97: '97', 98: '98', 99: '99'}

具体方法

第一种：

dict={"a":1,"b":2,"c":3}
inverse_dic={}
for key,val in dict.items():
    inverse_dic[val]=key

第二种（推荐）：

dict_list={"a":1,"b":2,"c":3}
inverse_dict=dict([val,key] for key,val in dict_list.items())

第三种：

dict_list={"a":1,"b":2,"c":3}
mydict_new=dict(zip(dict_list.values(),dict_list.keys())

参考资料

1. Python将字典中的键值对反转方法：https://blog.csdn.net/ityti/article/details/85098699