Python subprocess.Popen

Question

我有下面的代码，它从网络抓取中获取数据。我刚学会了如何使用

subprocess.Popen

我正试图利用我的主动性，以及其他类似问题的答案--如何使用

subprocess.Popen

要执行下面的脚本，将webscrape数据放到我的插入字段中，每30秒左右更新一次。但这是行不通的。请你指出正确的方向好吗？

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编号22:引用在

     (["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，我必须关闭计算机来停止它！

我用“r”前缀修改了对我的文件的引用如下：

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

但是删除了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使用反斜杠引用字符，比如\n = newline和\t = tab。

使用r前缀生成一个原始字符串文本，就像Windows：

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