如何将所有csv文件合并为一个文件，并将数据堆叠在原始标题下

Question

我是python的新手，正在尝试理解数据操作。

我有一个文件夹，里面有几个文件。其中一些是csv。我想将所有csv-大约400个csv合并为一个csv，所有数据都要堆叠

例如，如果第一个csv有一个数据帧-

transcript  confidence  from    to  speaker Negative Neutral    Positive    compound
thank you   0.85    1.39    1.65    0   0   0.754              0.246         0.7351

第二个有一个数据帧：

transcript confidence  from    to  speaker Negative Neutral    Positive compound
welcome     0.95       1.39   1.65  0   0       0.754        0.201   0.8351

我希望最后的df看起来像-

transcript  confidence from to  speaker Negative Neutral      Positive       compound
thank you   0.85      1.39  1.65    0   0       0.754              0.246         0.7351
welcome     0.95      1.39  1.65    0   0       0.754              0.201         0.8351

我试过了-

import glob
import pandas as pd
# Folder containing the .csv files to merge
file_path = "C:\Users\Desktop"
# This pattern \* selects all files in a directory
pattern = file_path + "\*"
files = glob.glob(pattern)
# Import first file to initiate the dataframe
df = pd.read_csv(files[0],encoding = "utf-8", delimiter = ",")
# Append all the files as dataframes to the first one
for file in files[1:len(file_list)]:
df_csv = pd.read_csv(file,encoding = "utf-8", delimiter = ",")
df = df.append(df_csv)

但这并没有奏效。我该如何解决这个问题？

Answer 1

这应该会有所帮助：

import pandas as pd
import glob
import os.path
file_path = "C:/Users/Desktop"
data = []
for csvfile in glob.glob(os.path.join(file_path, "*.csv")):
df = pd.read_csv(csvfile, encoding="utf-8", delimiter=",")
data.append(df)
data = pd.concat(data, ignore_index=True)

Answer 2

注意：-我建议您不要从桌面获取所有CSV文件。请将其保存到一个目录中，如果你想在未来分析特定的数据集，这也会很有帮助。

解决方案之前的基本要求：-所有要合并的CSV文件都应该在同一目录中。

# Import all Important Libraries
# 'os' module will provide a portable way of using an operating system with dependent functionality such as 'Open File', and much more...
import os
# 'glob' module helps to find all the pathnames matched with a specified pattern according to the rules. Such as '*.csv' which is used in our case for finding all CSV Files
import glob
# 'pandas' is a fast, powerful, flexible, and easy to use open-source data analysis and manipulation tool
import pandas as pd
# First of all declare 'path' variable for finding all the CSV  
path = "C:/Users/Desktop"
# Store all files in 'all_files' using 'glob' function. and a pattern used is '*.csv' Which will find all the CSV and 'join' it
all_files = glob.glob(os.path.join(path, "*.csv"))
# Initialize 'DataFrame' Variable from each fetched CSV file
df_from_each_file = (pd.read_csv(csvfiles) for csvfiles in all_files) 
# if you have 'Seperator' then use 'pd.read_csv(csvfiles, sep='seprator pattern ('', ',', etc.)')' in above code
# Concat all the 'DataFrame' using 'pd.concat()'
df_merged   = pd.concat(df_from_each_file, ignore_index=True)
# Store Merged CSV Files into 'merged.csv' File
df_merged.to_csv("merged.csv")