Python 定時子進程.Popen

Question

我有以下代碼從網頁抓取數據。 我剛剛學會了如何使用

subprocess.Popen

我正在嘗試利用我的主動性以及關於如何使用

subprocess.Popen

執行下面的腳本以將 webscrape 數據放入我的插入字段中，每 30 秒左右更新一次。 但它不起作用。 請你能指出我正確的方向嗎？

import xlrd
import subprocess
from Tkinter import *
import urllib2
from ttk import *
import Tkinter as tk

class Application(Frame):
    """GUI to display results of 'equity get'"""
    
    def __init__(self, master):
        """initialise the Frame"""
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()
 
    def create_widgets(self):
        """Create button, text and entry Widget"""
        """what it is i.e. label"""
        
        url = "https://......."
        request= urllib2.Request(url)
        handle = urllib2.urlopen(request)
        content = handle.read()
        splitted_page = content.split("<.......">", 1);
        splitted_page = splitted_page24[1].split("</.......>", 1)

        self.data = Label(self, text ="Data")
        self.data1 = Entry(self, width = 10)
        self.data1.insert(0,splitted_page[0])

        self.data.grid(column = 1, row = 1)
        self.data1.grid(column = 2, row = 1)
        self.data1.grid(column = 3, row = 1)            

        a = 0
        while a < 10:
            a += 1
            time.sleep(15)
        while True:
            out =   subprocess.Popen(["C:\Users\.....\Desktop\Py\python.exe","C:\Users\.....\Desktop\..\Python27\.....\tester.py"])

app = Application(root)
root.title("reload test")
root.geometry("700x300")
root.mainloop()

我得到的錯誤是錯誤號 22：無效的語法指代之間的腳本

     (["C:\Users\.....\Desktop\Py\python.exe","C:\Users\.....\Desktop\..\Python27\.....\tester.py"])

然后多個命令行窗口打開顯示相同的錯誤，我必須關閉計算機才能停止它！

我使用“r”前綴修改了對我的文件的引用，如下所示：

([r"C:\Users\.....\Desktop\..\Python27\.....\tester.py"])

但刪除了 python.exe 調用，因為它只是調用命令行窗口。 現在，我收到以下錯誤消息：

Traceback (most recent call last):
File "C:\Users\....\Desktop\Py\Python27\.....\tester.py", line 46, in <module>
app = Application(root)
File "C:\Users\......\Desktop\Py\Python27\.....\tester.py", line 18, in __init__
self.create_widgets()
File "C:\Users\.....\Desktop\Py\Python27\......\tester.py", line 44, in create_widgets
out = subprocess.Popen([r"C:\Users\Isaac\Desktop\Py\Python27\.....\tester.py"])
File "C:\Users\.....\Desktop\Py\lib\subprocess.py", line 672, in __init__
errread, errwrite)
File "C:\Users\.....\Desktop\Py\lib\subprocess.py", line 882, in _execute_child
startupinfo)
WindowsError: [Error 193] %1 is not a valid Win32 application

Answer 1

Python 使用反斜杠來引用字符，例如\\n = 換行符和\\t = 制表符。

使用r前綴創建原始字符串文字，如 Windows 文件路徑：

out =  subprocess.Popen([r"C:\Users\.....\Desktop\Py\python.exe", r"C:\Users\.....\Desktop\..\Python27\.....\tester.py"])