如何在Python版本3.5.2中从文件中读取（从一个字符串到另一个多行）

Question

我使用Tkinter在Python（ver 3.5.2）中创建了一个应用程序，并且遇到了以下问题。

我想从文件中读取数据（从一个字符串到另一个字符串 - 多行）。 “起始”字符串是用户选择的，并且结束字符串被确定并且是'='。

什么我迄今所做的是：

#click on button writes data from file: 

    open = Button(self, text="Open", command = self.openTXT, width=20).grid(row=5, column=3, pady=5, padx = 10, sticky=W) 

#user enters the starting string in file 

     self.entry = Entry(self, width=30).grid(sticky = W, pady=7, padx=5, column=4, row=2) 

#i want to display data from file in this Text field 

self.text = Text(self).grid(column=4, row=4,pady=8, padx=5, columnspan=2, rowspan=6,sticky=E+W+S+N) 

#this function finds the starting string and writes down line in which getInfo is found. How do I add the end string (the end string in my case is '=') and read multiple lines and not just one, like it is right now 
def openTXT(self): 
     getInfo = self.entry.get() 
     f = open('mojDnevnik.txt', encoding='utf-8') 
     for line in f.readlines(): 
      if getInfo in line: 
       self.text.insert(1.0, line) 

例子：

用户条目： “SAT”

文件mojDnevnik.txt：

Friday Nov 18 2016 

Testing 

========================================== 

Sat Nov 19 2016 

Testing reading from file 

========================================== 

输出应该是：

Sat Nov 19 2016 

Testing reading from file 

感谢您的帮助。

Answer 1

你可以使用一个标志到信号时捕获数据 -

def openTXT(self): 
    getInfo = self.entry.get() 
    f = open('mojDnevnik.txt', encoding='utf-8') 
    flag = False 
    for line in f.readlines(): 
     if getInfo in line: 
      self.text.insert(1.0, line) 
      flag = True 
     elif flag and not line.startswith('='): 
      self.text.insert(1.0, line) 
     elif line.startswith('='): 
      flag = False 

---

当然，你可能需要使用不同的名称flag所以代码有意义当你阅读。