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代码：

import pandas as pd
df = pd.DataFrame(list(inverted_index.items()),columns = ['words','docids']) 
from pandas.io import sql
from sqlalchemy import create_engine
engine = create_engine("mysql+pymysql://{user}:{pw}@localhost/{db}"
                       .format(user="root",
                               pw="shreshre",
                               db="nltk"))
df.to_sql(con=engine, name='documents', if_exists='replace')

输出： 我的错误页面和代码输出的图像

在这里，我想将字典类型的倒排索引转换为数据帧并写入 MySQL。但我收到一个错误：

OperationalError: (pymysql.err.OperationalError) (1241, 'Operand should contain 1 column(s)')
[SQL: INSERT INTO documents (`index`, words, docids) VALUES (%(index)s, %(words)s, %(docids)s)]
[parameters: ({'index': 0, 'words': 'bank', 'docids': {0, 1, 2, 3, 4, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 37, 38, 39, 40, 41, 43, 44, 45, 46, 48, 52, 53, 54, 55, 56, 59, 60, 62, 64, 66, 67, 68, 69 ... (1314 characters truncated) ...  719, 720, 721, 722, 724, 726, 728, 733, 734, 735, 736, 737, 739, 740, 743, 746, 748, 752, 753, 755, 756, 757, 758, 759, 762, 765, 766, 767, 768, 772}}, {'index': 1, 'words': 'defin', 'docids': {0, 2, 354, 612, 773, 76, 84}}, {'index': 2, 'words': 'establish', 'docids': {0, 161, 391, 328, 330, 718, 719, 720, 722, 245, 217, 411, 156}}, {'index': 3, 'words': 'custodi', 'docids': {0, 405}}, {'index': 4, 'words': ',', 'docids': {0, 1, 2, 3, 8, 14, 17, 20, 22, 24, 25, 26, 27, 30, 31, 41, 43, 45, 48, 49, 51, 52, 54, 55, 59, 62, 63, 65, 67, 69, 70, 72, 73, 74, 76, 78, 79, 80, 81 ... (1428 characters truncated) ...  705, 706, 708, 710, 711, 712, 716, 718, 719, 721, 722, 724, 729, 730, 732, 735, 736, 741, 743, 745, 749, 756, 757, 758, 762, 766, 768, 769, 771, 773}}, {'index': 5, 'words': 'loan', 'docids': {0, 512, 517, 519, 538, 29, 33, 34, 557, 558, 47, 559, 564, 574, 578, 580, 70, 73, 76, 79, 616, 621, 113, 114, 115, 116, 117, 123, 124, 127, 128, 129, ... (75 characters truncated) ...  711, 200, 219, 227, 228, 234, 235, 241, 758, 771, 309, 310, 340, 343, 346, 349, 354, 365, 368, 380, 383, 384, 385, 386, 440, 447, 448, 451, 453, 474}}, {'index': 6, 'words': 'exchang', 'docids': {0, 416, 290, 354, 357, 425, 10, 302, 430, 405, 376, 415}}, {'index': 7, 'words': 'issu', 'docids': {0, 386, 419, 676, 390, 397, 302, 272, 274, 306, 722, 700, 350}}  ... displaying 10 of 1969 total bound parameter sets ...  {'index': 1967, 'words': '86', 'docids': {774}}, {'index': 1968, 'words': 'separ', 'docids': {774}})]

我无法理解Stackoverflow 上发布的有关类似错误的现有解决方案。有人请帮帮我。

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