从循环连接表得到错误 - InvalidIndexError：重新索引仅对唯一值的索引对象有效

问题描述

我需要连接从循环创建的表。列中有重复的名称，但它们讲述的是不同的故事，但由于某种原因，在运行此代码时出现错误：

InvalidindexError: Reindexing only valid with uniquely valued Index objects

代码如下：

url = 'https://www.impactfees.com/publications%20pdf/2019survey.pdf'

tables = camelot.read_pdf(url,flavor = 'stream',edge_tol = 500,pages = '4-end')

i = 0


while i in range(0,tables.n):
    table_value = tables[i].df.loc[0,4]
    header = 1
    header = tables[i].df.iloc[header]
    tables[i].df = tables[i].df.rename(columns = header)
    
    nan_v = float("NaN")
    tables[i].df.replace('',nan_v,inplace = True) 
    tables[i].df.dropna(subset = ['Jurisdiction'],inplace = True)
    tables[i].df.replace(['Jurisdiction'],inplace = True)
    tables[i].df.dropna(subset = ['Jurisdiction'],inplace = True)

#    Tot_col = tables[i].df.columns.get_loc('Total')
#    tables[i].df = tables[i].df.iloc[:,0:Tot_col+1]
    tables[i].df['report_name'] = table_value
    tables[i].df.loc[~tables[i].df.index.duplicated(keep = 'first')]
    i = i + 1

dfs = pd.concat([table.df for table in tables])

dfs

这是我得到的错误：

InvalidindexError                         Traceback (most recent call last)
<ipython-input-133-2617eb5ae448> in <module>
     23     i = i + 1
     24 
---> 25 dfs = pd.concat([table.df for table in tables])
     26 
     27 

~\anaconda3\lib\site-packages\pandas\core\reshape\concat.py in concat(objs,axis,join,ignore_index,keys,levels,names,verify_integrity,sort,copy)
    296     )
    297 
--> 298     return op.get_result()
    299 
    300 

~\anaconda3\lib\site-packages\pandas\core\reshape\concat.py in get_result(self)
    514                     obj_labels = obj.axes[1 - ax]
    515                     if not new_labels.equals(obj_labels):
--> 516                         indexers[ax] = obj_labels.get_indexer(new_labels)
    517 
    518                 mgrs_indexers.append((obj._mgr,indexers))

~\anaconda3\lib\site-packages\pandas\core\indexes\base.py in get_indexer(self,target,method,limit,tolerance)
   3169 
   3170         if not self.is_unique:
-> 3171             raise InvalidindexError(
   3172                 "Reindexing only valid with uniquely valued Index objects"
   3173             )

InvalidindexError: Reindexing only valid with uniquely valued Index objects

解决方法

• camelot 有问题。我不得不修补 utils.py 以使用不同的 user-agent
• 页面不完全一致，因此将 list 传递给 rename(columns=) 不起作用。你需要传递一个dict
• 保留了两个数据框 - 一个包含目标行，另一个包含排除的行
• 仍然存在不一致的列，例如排水公园

import pandas as pd
import camelot

url = 'https://www.impactfees.com/publications%20pdf/2019survey.pdf'
tables = camelot.read_pdf(url,flavor = 'stream',edge_tol = 500,pages = '4-end')

df = pd.DataFrame()
dfexc = pd.DataFrame()
for i in range(tables.n):
    dft = tables[i].df.rename(columns={i:v.replace("\n"," ") for i,v in tables[i].df.iloc[1].items() if v!=""})
    if " " in dft.columns[0]: 
        dft = dft.rename(columns={dft.columns[0]:dft.columns[0].split(" ")[0],1:dft.columns[0].split(" ")[1]})
    m = (dft.State.str.len()!=2) | (dft.index < 2)

    dfexc = pd.concat([dfexc,tables[i].df.loc[m].assign(page=i)])
    df = pd.concat([df,dft.loc[~m].assign(page=i)])#.reset_index(drop=True)