Python 定时子进程.Popen

Question

我有以下代码从网页抓取数据。 我刚刚学会了如何使用

subprocess.Popen

我正在尝试利用我的主动性以及关于如何使用

subprocess.Popen

执行下面的脚本以将 webscrape 数据放入我的插入字段中，每 30 秒左右更新一次。 但它不起作用。 请你能指出我正确的方向吗？

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()

我得到的错误是错误号 22：无效的语法指代之间的脚本

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

然后多个命令行窗口打开显示相同的错误，我必须关闭计算机才能停止它！

我使用“r”前缀修改了对我的文件的引用，如下所示：

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

但删除了 python.exe 调用，因为它只是调用命令行窗口。 现在，我收到以下错误消息：

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 使用反斜杠来引用字符，例如\\n = 换行符和\\t = 制表符。

使用r前缀创建原始字符串文字，如 Windows 文件路径：

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