<s>[INST] import tkinter as tk
from tkinter import ttk, filedialog, simpledialog
import csv
import io

class App(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title('My App')
        self.geometry('400x200')
        self.label = tk.Label(self, text='Select a csv file:')
        self.label.pack()
        self.entry = tk.Entry(self, width=50)
        self.entry.pack()
        self.button = tk.Button(self, text='Browse', command=self.browse)
        self.button.pack()
        self.button2 = tk.Button(self, text='Load', command=self.load)
        self.button2.pack()
        self.text_area = tk.Text(self, height=5, width=50)
        self.text_area.pack()

    def browse(self):
        file_path = filedialog.askopenfilename(
                title='Select a csv file',
                filetypes=[('CSV files', '*.csv'), ('All files', '*.*')]
        )
        self.entry.delete(0, tk.END)
        self.entry.insert(tk.END, file_path)

    def load(self):
        file_path = self.entry.get()
        with open(file_path, 'r') as file:
            reader = csv.reader(file)
            data = list(reader)
        self.text_area.delete(1.0, tk.END)
        for row in data:
            self.text_area.insert(tk.END, ','.join(row) + '\n')

root = App()
root.mainloop()

This code works fine for opening and displaying the contents of a .csv file in a tkinter Text widget. However, I want to modify it to instead load the contents of the .csv file into a treeview widget. 

I would like to columns headings to be read from the first row of the .csv file and the rest of the data to be loaded into the treeview rows. Here is my attempt so far:

import tkinter as tk
from tkinter import ttk, filedialog
import csv

class App(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title('My App')
        self.geometry('800x600')
        self.label = tk.Label(self, text='Select a csv file:')
        self.label.pack()
        self.entry = tk.Entry(self, width=50)
        self.entry.pack()
        self.button = tk.Button(self, text='Browse', command=self.browse)
        self.button.pack()
        self.button2 = tk.Button(self, text='Load', command=self.load)
        self.button2.pack()
        self.treeview = ttk.Treeview(self, columns=['column1', 'column2', 'column3', 'column4', 'column5'], show='headings')

    def browse(self):
        file_path = filedialog.askopenfilename(
                title='Select a csv file',
                filetypes=[('CSV files', '*.csv'), ('All files', '*.*')]
        )
        self.entry.delete(0, tk.END)
        self.entry.insert(tk.END, file_path)

    def load(self):
        file_path = self.entry.get()
        with open(file_path, 'r') as file:
            reader = csv.reader(file)
            data = list(reader)
            self.treeview['columns'] = data[0]
            self.treeview.pack()
            for row in data[1:]:
                self.treeview.insert('', 'end', values=row)

root = App()
root.mainloop()

However, I am getting an error because the 'columns' option in the treeview widget should be a list of strings. So, I need to convert each column heading to a string. I am not sure how to do this.

Any suggestions would be great. 

Additionally, does my approach seem correct so far?[/INST]