ConfigParser.set未按預期作業

我無法理解為什么我的代碼沒有按預期作業。當我第一次啟動我的程式時，我想選擇兩個資料集的路徑。

＃進口

import tkinter as tk
import pandas as pd
from configparser import ConfigParser
from tkinter import filedialog
from tkinter.messagebox import showerror, showinfo

#更新dataset1路徑的函式

def load_dataset1_directory():

    load_dataset1_dir= filedialog.askdirectory()
    parser = ConfigParser()
    parser.read("config.ini")
    parser.set("path", "load_dataset1_path", load_dataset1_dir)
    with open("config.ini","w") as configfile:
            parser.write(configfile)

#更新dataset2路徑的函式

def load_dataset2_directory():

    load_dataset2_dir= filedialog.askdirectory()
    parser = ConfigParser()
    parser.read("config.ini")
    parser.set("path", "load_dataset2_path", load_dataset2_dir)
    with open("config.ini","w") as configfile:
            parser.write(configfile)

#讀取組態檔

try:
        parser = ConfigParser()
        parser.read("config.ini")
        saved_load_dataset1_path = parser.get("path", "load_dataset1_path")
        saved_load_dataset2_path = parser.get("path", "load_dataset2_path")
except:
        showerror(
                title='Error',
                message='Error 0: Configuration File not found')

#根視窗

root = tk.Tk()
root.geometry("800x500")
root.resizable(True, True)
root.title('Prg1')

#嘗試獲取資料集

try:
        df_1 = pd.read_excel(saved_load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(saved_load_dataset2_path "/data2.xlsx")
except:

        showerror(
                title='Error',
                message='Error 1: Data not found')

        showinfo(
                title='Select Data',
                message='Select Dataset1')
        load_dataset1_directory()

        showinfo(
                title='Select Data',
                message='Select Dataset2')
        load_dataset2_directory()
        saved_load_dataset1_path = parser.get("path", "load_dataset1_path")
        saved_load_dataset2_path = parser.get("path", "load_dataset2_path")
        df_1 = pd.read_excel(saved_load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(saved_load_dataset2_path "/data2.xlsx")

root.mainloop()

使用以下 confing.ini 首次運行代碼

[path]
load_dataset1_path = dummy
load_dataset2_path = dummy

回傳錯誤：

FileNotFoundError：[Errno 2] 沒有這樣的檔案或目錄：'dummy/dataset1.xlsx'

出錯后就關機了。

如果我再次運行代碼，一切都會按預期作業，沒有任何例外。.ini 檔案具有每個資料集的正確路徑。為什么我第一次運行代碼時 .ini 檔案沒有更新？為什么它保留每條路徑的舊值？

uj5u.com熱心網友回復：

請注意，您parser在以下代碼中使用了在更新組態檔之前加載的，因此設定仍然是舊的：

try:
        parser = ConfigParser()
        parser.read("config.ini")
        saved_load_dataset1_path = parser.get("path", "load_dataset1_path")
        saved_load_dataset2_path = parser.get("path", "load_dataset2_path")
except:
        showerror(
                title='Error',
                message='Error 0: Configuration File not found')

...

try:
        df_1 = pd.read_excel(saved_load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(saved_load_dataset2_path "/data2.xlsx")
except:

        showerror(
                title='Error',
                message='Error 1: Data not found')

        showinfo(
                title='Select Data',
                message='Select Dataset1')
        load_dataset1_directory()

        showinfo(
                title='Select Data',
                message='Select Dataset2')
        load_dataset2_directory()
        # parser is the already loaded one in the above try/except block which contains the old content of the configuration file
        saved_load_dataset1_path = parser.get("path", "load_dataset1_path") # get 'dummy'
        saved_load_dataset2_path = parser.get("path", "load_dataset2_path") # get 'dummy'
        df_1 = pd.read_excel(saved_load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(saved_load_dataset2_path "/data2.xlsx")

我建議在load_dataset1_directory()和中回傳選定的檔案夾load_dataset2_directory()：

def load_dataset1_directory():

        load_dataset1_dir= filedialog.askdirectory()
        parser = ConfigParser()
        parser.read("config.ini")
        parser.set("path", "load_dataset1_path", load_dataset1_dir)
        with open("config.ini","w") as configfile:
                parser.write(configfile)

        return load_dataset1_dir

def load_dataset2_directory():

        load_dataset2_dir= filedialog.askdirectory()
        parser = ConfigParser()
        parser.read("config.ini")
        parser.set("path", "load_dataset2_path", load_dataset2_dir)
        with open("config.ini","w") as configfile:
                parser.write(configfile)

        return load_dataset2_dir

然后通過上述兩個函式的回傳值更新這兩個變數：

try:
        df_1 = pd.read_excel(load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(load_dataset2_path "/data2.xlsx")
except:

        showerror(
                title='Error',
                message='Error 1: Data not found')

        showinfo(
                title='Select Data',
                message='Select Dataset1')
        saved_load_dataset1_path = load_dataset1_directory()

        showinfo(
                title='Select Data',
                message='Select Dataset2')
        saved_load_dataset2_path = load_dataset2_directory()
        #saved_load_dataset1_path = parser.get("path", "load_dataset1_path")
        #saved_load_dataset2_path = parser.get("path", "load_dataset2_path")
        df_1 = pd.read_excel(saved_load_dataset1_path "/data1.xlsx")
        df_2 = pd.read_excel(saved_load_dataset2_path "/data2.xlsx")

標籤：Python tkinter 初始化 尝试除外 配置解析器

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