python - 试图连接多个 csv 文件,目录错误?
问题描述
所以我试图连接这些巨大的 csv 文件(顶部的标题)。相关代码如下。我附上了我从中提取的目录的屏幕截图。
#import libraries
import numpy as np
import pandas as pd
from glob import glob
from os import chdir
#import data frames
pm18 = pd.read_csv('pm18.csv', encoding='ISO-8859-1', low_memory=False)
pm17 = pd.read_csv('pm17.csv', encoding='ISO-8859-1', low_memory=False)
pm16 = pd.read_csv('pm16.csv', encoding='ISO-8859-1', low_memory=False)
pm15 = pd.read_csv('pm15.csv', encoding='ISO-8859-1', low_memory=False)
pm14 = pd.read_csv('pm14.csv', encoding='ISO-8859-1', low_memory=False)
pm13 = pd.read_csv('pm13.csv', encoding='ISO-8859-1', low_memory=False)
pm12 = pd.read_csv('pm12.csv', encoding='ISO-8859-1',low_memory=False)
#list files in directory
csv_file_path = (r'C:\Users\EDraklellis\Desktop\FebruaryDownloads\FebruaryDownloads')
chdir(csv_file_path)
# List all CSV files in the working dir
file_pattern = ".csv"
list_of_files = [file for file in glob('*.{}'.format('.csv'))]
print(list_of_files)
[]
#concatenate listed files
def produceOneCSV(list_of_files, file_out):
# Consolidate all CSV files into one object
result_obj = pd.concat([pd.read_csv(file) for file in list_of_files])
# Convert the above object into a csv file and export
result_obj.to_csv(file_out, index=False, encoding="utf-8")
file_out = "mergell84.csv"
produceOneCSV(list_of_files, file_out)
Then the error comes up:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-128-bbd8f21b6031> in <module>
5 result_obj.to_csv(file_out, index=False, encoding="utf-8")
6 file_out = "mergell84.csv"
----> 7 produceOneCSV(list_of_files, file_out)
<ipython-input-128-bbd8f21b6031> in produceOneCSV(list_of_files, file_out)
1 def produceOneCSV(list_of_files, file_out):
2 # Consolidate all CSV files into one object
----> 3 result_obj = pd.concat([pd.read_csv(file) for file in list_of_files])
4 # Convert the above object into a csv file and export
5 result_obj.to_csv(file_out, index=False, encoding="utf-8")
C:\ProgramData\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in concat(objs, axis, join, join_axes, ignore_index, keys, levels, names, verify_integrity, sort, copy)
253 verify_integrity=verify_integrity,
254 copy=copy,
--> 255 sort=sort,
256 )
257
C:\ProgramData\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in __init__(self, objs, axis, join, join_axes, keys, levels, names, ignore_index, verify_integrity, copy, sort)
302
303 if len(objs) == 0:
--> 304 raise ValueError("No objects to concatenate")
305
306 if keys is None:
ValueError: No objects to concatenate
显然,我意识到当我打印并且唯一的输出是'[]'时,那里没有文件,但我不明白为什么不。请帮忙!谢谢
解决方案
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