如何在pandas中同时读取多个csv文件

Question

嗨，我试图让用户访问 select 三个文件，然后在用户选择并按下打开后将它们读入程序。 我尝试了以下代码，但收到以下错误消息。 我希望它在打开后打印出文件名，这在我有代码一次打开一个文件时有效，但我希望它也适用于多个文件，只是不确定它是否可能。

> 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'>

我的代码如下。

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的文档非常薄，但考虑到它可以让您 select 多个文件，它的返回值是某种集合是一个不错的选择。 果然，如果您将print(filename)移到失败的行上方，则表明返回了一个文件名tuple 。 因此，遍历这些名称以创建数据框。

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)