python - 如何使用 tkinter 提示用户将 DataFrame 保存到 Excel 文件？

Question

我是 Python 和一般编程的新手。我正在尝试为我编写的一些代码构建一个 GUI，这些代码从 Excel 导入数据，进行一些分析，然后将新数据从 DataFrame 导出到另一个 Excel 文件。我以前使用过这段代码，但现在我需要一个提示，询问用户他们想将文件保存到哪里:

writer = pd.ExcelWriter("Results.xlsx", engine="xlsxwriter")
data.to_excel(writer, index=False, sheet_name="Results")
worksheet = writer.sheets["Results"]
writer.save()

不幸的是，当我使用 asksaveasfilename 时，无法保存新的 Excel 文件。这是我用来测试文件保存的内容:

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter.filedialog import asksaveasfilename
from tkinter.messagebox import showerror
import pandas as pd

class Analysis:
    def __init__(self, master):
        self.master = master
        master.title("Test")

        self.message = "Select an Excel file to import."
        self.label_text = StringVar()
        self.label_text.set(self.message)
        self.label = Label(master, textvariable=self.label_text)

        self.button = Button(master, text="Browse", command=self.load_file)
        self.label.grid(row=0, column=0, columnspan=2, sticky=W)
        self.button.grid(row=1, column=0, sticky=W)

    def load_file(self):
        file = askopenfilename(filetypes=(("Excel files", "*.xlsx"),
                                           ("All files", "*.*") ))
        if file:
            try:
                data = pd.read_excel(file,sheetname="Sheet1")
                #this doesn't save anything
                savefile = asksaveasfilename(mode="w",filetypes=(("Excel files", "*.xlsx"),
                                                          ("All files", "*.*") ))
                #used this code before
                writer = pd.ExcelWriter("Results.xlsx", engine="xlsxwriter")
                data.to_excel(writer, index=False, sheet_name="Results")
                worksheet = writer.sheets["Results"]
                writer.save()                
                self.message = "Complete"
                self.label_text.set(self.message)
            except:
                self.message = "Error"
                self.label_text.set(self.message)
                showerror("Open Source File", "Failed to import file\n'%s'" % file)
            return

root=Tk()
my_gui = Analysis(root)
root.mainloop()

我很感激任何帮助。谢谢!

编辑:我让它工作了

    def load_file(self):
        file = askopenfilename(filetypes=(("Excel files", "*.xlsx"),
                                       ("All files", "*.*") ))
        if file:
            try:
                savefile = asksaveasfilename(filetypes=(("Excel files", "*.xlsx"),
                                                         ("All files", "*.*") ))               
                data = pd.read_excel(file,sheetname="Sheet1")
                data.to_excel(savefile + ".xlsx", index=False, sheet_name="Results")         
                self.message = "Complete"
                self.label_text.set(self.message)
            except:
                self.message = "Error. Please try again."
                self.label_text.set(self.message)
                showerror("Open Source File", "Failed to import file\n'%s'" % file)
            return

Answer 1

不应该有 mode 选项。这足够了:

savefile = asksaveasfilename(filetypes=(("Excel 文件", "*.xlsx"), (“所有文件”， ”*。*”) ))