为什么附加不起作用?如何在一张新的Excel工作表中提取来自Excel的特定列

问题描述

问题是: 我想从多个不同的excell(.xlsx)填充,特定的ccolumns中提取并将所有这些保存在不同的excell-Sheet中。 我可以在终端中使用DataFrame,但只能将最后加载的.xlsx保存在excell工作表中。 我做错了什么?如何解决这个问题? 熊猫对这个常见问题有一个简单的命令吗? 我尝试了许多来自“ stackoverflow”的解决方案,但我找不到正确的方法

    import pandas as pd
    import numpy as np
    
    df_col=pd.DataFrame()
    
    print(df_col)
    
    i=0
    while i<len(files):
        # Import the excel file and call it xls_file
        xls_file = pd.ExcelFile(files[i])
        # Load the xls file's Sheet1 as a dataframe
        df = xls_file.parse()
        need_df = pd.read_excel(files[i],usecols=list_col_pros) 
        ########################################################
        # Create a Pandas Excel writer using XlsxWriter as the engine.
        df_col.append(need_df)
        ##########################################################
        # Returns column with label col as Series
        print(need_df)
        
        i=i+1
    
    ##########################
    
    
    print(df_col)
    writer = pd.ExcelWriter('all_pros.xlsx',engine='xlsxwriter')
    
    # Write each dataframe to a different worksheet.
    df_col.to_excel(writer,sheet_name='Sheet')
    # Close the Pandas Excel writer and output the Excel file.
    writer.save()

解决方法

所以这可以工作。我用标题为“开始位置”的列B制作了一些虚拟文件 但我认为您应该可以轻松地将其更改为文件名/列。

import pandas as pd
import numpy as np

df_col=pd.DataFrame()

print(df_col)
files = ["1.xlsx","2.xlsx","3.xlsx"]
i=0
while i<len(files):
    # Import the excel file and call it xls_file
#   xls_file = pd.ExcelFile(files[i])
    # Load the xls file's Sheet1 as a dataframe
#   df = xls_file.parse()
    need_df = pd.read_excel(files[i],usecols="B") 
    ########################################################
    # Create a Pandas Excel writer using XlsxWriter as the engine.
    df_col[files[i]] = need_df['First Position'].values
    ##########################################################
    # Returns column with label col as Series
    print(need_df)
    
    i=i+1

##########################


print(df_col)
writer = pd.ExcelWriter('all_pros.xlsx',engine='xlsxwriter')

# Write each dataframe to a different worksheet.
df_col.to_excel(writer,sheet_name='Sheet')
# Close the Pandas Excel writer and output the Excel file.
writer.save()