如何在pandas中同時讀取多個csv文件

Question

嗨，我試圖讓用戶訪問 select 三個文件，然后在用戶選擇並按下打開后將它們讀入程序。 我嘗試了以下代碼，但收到以下錯誤消息。 我希望它在打開后打印出文件名，這在我有代碼一次打開一個文件時有效，但我希望它也適用於多個文件，只是不確定它是否可能。

> Exception in Tkinter callback Traceback (most recent call last):  
> File "C:\Users\John\anaconda3\lib\tkinter\__init__.py", line 1883, in
> __call__
>     return self.func(*args)   File "<ipython-input-7-0367338b5787>", line 24, in file_opener
>     read_file = pd.read_csv (filename, "r","w",error_bad_lines=False, engine="python")   File
> "C:\Users\John\anaconda3\lib\site-packages\pandas\io\parsers.py", line
> 676, in parser_f
>     return _read(filepath_or_buffer, kwds)   File "C:\Users\John\anaconda3\lib\site-packages\pandas\io\parsers.py", line
> 430, in _read
>     fp_or_buf, _, compression, should_close = get_filepath_or_buffer(   File "C:\Users\John\anaconda3\lib\site-packages\pandas\io\common.py",
> line 200, in get_filepath_or_buffer
>     raise ValueError(msg) ValueError: Invalid file path or buffer object type: <class 'tuple'>

我的代碼如下。

import pandas as pd
import tkinter as tk
import csv
import json
import numpy as np
import re
import matplotlib.pyplot as plt
import fileinput
from tkinter import filedialog
from tkinter import messagebox
from tkinter import Menu



root = tk.Tk()
root.title("Data Tools 101")
root.geometry("650x700")


def file_opener():
    global read_file

    filename = filedialog.askopenfilenames(initialdir = "/", title = "Open files", multiple=True)
    read_file = pd.read_csv (filename, "r","w",error_bad_lines=False, engine="python")


    df = pd.read_csv('Inspections.csv')
    print(filename)

menubar = Menu(root)
filemenu = Menu(menubar, tearoff=0)
filemenu.add_command(label='Open File',command = file_opener)
filemenu.add_separator()
menubar.add_cascade(label='File', menu=filemenu)

root.config(menu=menubar)
root.mainloop()

Answer 1

tkinter.filedialog.askopenfilenames的文檔非常薄，但考慮到它可以讓您 select 多個文件，它的返回值是某種集合是一個不錯的選擇。 果然，如果您將print(filename)移到失敗的行上方，則表明返回了一個文件名tuple 。 因此，遍歷這些名稱以創建數據框。

import json
import numpy as np
import re
import matplotlib.pyplot as plt
import fileinput
import tkinter as tk
from tkinter import filedialog
from tkinter import messagebox
from tkinter import Menu
import pandas as pd

root = tk.Tk()
root.title("Data Tools 101")
root.geometry("650x700")

def file_opener():
    global read_file

    filenames = filedialog.askopenfilenames(initialdir = "/", title = "Open files", multiple=True)
    dfs = []
    for filename in filenames:
        print("opening", filename)
        dfs.append(pd.read_csv (filename, error_bad_lines=False, engine="python"))
        print(dfs[-1])

menubar = Menu(root)
filemenu = Menu(menubar, tearoff=0)
filemenu.add_command(label='Open File',command = file_opener)
filemenu.add_separator()
menubar.add_cascade(label='File', menu=filemenu)