Python 循环仅打印 dataframe 的最终循环为 output 到 ZC1D81AF58610844BFDCZD9

Question

一直停留在这个（很可能非常简单）问题上，但我的 output 到 Excel 只打印最终循环中的值。 我相信这与缩进有关，并尝试将值排除在失败的 for 循环之外。 这是一些有助于理解问题的虚拟代码：

#dummy code

#reads each file in folder, runs through a bunch of functions, and prints output in console
import os,glob
import csv
import pandas as pd
filename ='path to folder'
for filename in glob.glob(os.path.join(folder_path, '*.txt')):
    with open(filename, 'r') as f:
        text = f.read()
        data =function1(file= filename)
        data= function2(file= filename)
        data = function3(file= filename)
        final =pd.DataFrame(data)
        print(final)
        final.to_excel('output.xlsx')

控制台中的 Output 看起来像这样，这是正确的，我想导出到 csv：

0  some text here ...
1  more text...
2  clear text...
3  final data...
                                                   0
0  yes no...
1  does lots...
2  happy sunflower ...
3  ate food...

                                                  0
0  final data ...
1  apple strawberry...
2  different dataset...
3  dinne meals ...

任何意见，将不胜感激。 谢谢你。

Answer 1

您在 for 循环的每次迭代中都覆盖 output.csv。 尝试这样做

import pandas as pd
#use enumerate to have a counter variable at each index
for filename, n in enumerate(glob.glob(os.path.join(folder_path, '*.txt'))):
    with open(filename, 'r') as f:
        #your logic
        #this will be overwritten on next pass of for loop
        final = pd.DataFrame(data)
        #write to file with appended index- avoids file being overwritten on next pass
        final.to_csv("output_%d.csv" % n)

现在您的数据帧都将以 output_x.csv 的形式保存。 即如果找到三个文件，您将看到以下文件： output_1.csv, output_2.csv, output_3.csv