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[英]Import multiple CSV files into pandas and concatenate into one DataFrame
[英]How to import multiple csv files and concatenate into one DataFrame using pandas
我有問題No objects to concatenate
。 我無法從主目錄及其子目錄中導入.csv 文件,以將它們連接成一個 DataFrame。 我正在使用 pandas。 舊答案對我沒有幫助,所以請不要標記為重復。
文件夾結構是這樣的
main/*.csv
main/name1/name1/*.csv
main/name1/name2/*.csv
main/name2/name1/*.csv
main/name3/*.csv
import pandas as pd
import os
import glob
folder_selected = 'C:/Users/jacob/Documents/csv_files'
frame = pd.concat(map(pd.read_csv, glob.iglob(os.path.join(folder_selected, "/*.csv"))))
csv_paths = glob.glob('*.csv')
dfs = [pd.read_csv(folder_selected) for folder_selected in csv_paths]
df = pd.concat(dfs)
all_files = []
all_files = glob.glob (folder_selected + "/*.csv")
file_path = []
for file in all_files:
df = pd.read_csv(file, index_col=None, header=0)
file_path.append(df)
frame = pd.concat(file_path, axis=0, ignore_index=False)
如下檢查 Dask 庫,它將許多文件讀取到一個 df
>>> import dask.dataframe as dd
>>> df = dd.read_csv('data*.csv')
閱讀他們的文檔https://examples.dask.org/dataframes/01-data-access.html#Read-CSV-files
您需要遞歸搜索子目錄。
folder = 'C:/Users/jacob/Documents/csv_files'
path = folder+"/**/*.csv"
glob.iglob
df = pd.concat(map(pd.read_csv, glob.iglob(path, recursive=True)))
glob.glob
csv_paths = glob.glob(path, recursive=True)
dfs = [pd.read_csv(csv_path) for csv_path in csv_paths]
df = pd.concat(dfs)
os.walk
file_paths = []
for base, dirs, files in os.walk(folder):
for file in fnmatch.filter(files, '*.csv'):
file_paths.append(os.path.join(base, file))
df = pd.concat([pd.read_csv(file) for file in file_paths])
pathlib
from pathlib import Path
files = Path(folder).rglob('*.csv')
df = pd.concat(map(pd.read_csv, files))
Python 的pathlib
是完成此類任務的工具
from pathlib import Path
FOLDER_SELECTED = 'C:/Users/jacob/Documents/csv_files'
path = Path(FOLDER_SELECTED) / Path("main")
# grab all csvs in main and subfolders
df = pd.concat([pd.read_csv(f.name) for f in path.rglob("*.csv")])
如果 CSV 需要預處理,您可以創建一個 read_csv function 來處理問題並將其放置在 pd.read_csv 的位置
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