读取文件中的行

Question

我刚到特金特，不知道该怎么做， 我有一段代码，在tkinter中逐行读取。 有一个输入字段来输入文件中的行，当用户按下按钮时，如果

他键入的是文件中的第行。如果不是，则打印“不正确”

我只是不知道如何声明文件中的行，实际上我知道如何使用
对于文件中的行：

但是我的老师告诉我不要在tkinter中使用循环

我的代码：

import tkinter as tk
root = tk.Tk()

def callback(sv):
    print(sv.get())
    for line in f:
        if text == line:
          print("correct")

        else:
          print("incorrect")
    return sv.get()

f = open('sentences.txt', 'r')
sv = tk.StringVar(root)
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv))

label = tk.Label(root,text="")
label.pack()
e = tk.Entry(root, textvariable=sv)
tk.Button(root, text="Click for next",
          command=lambda: label.config(text=next(f))).pack()
e.pack()
text = e.get()


root.mainloop()

Answer 1

这是一个基于我对你们要求的理解的工作计划。为便于理解而留下评论

from tkinter import *

#before you proceed to create tkinter window, read the file in a list
fileLineList = [line. rstrip('\n') for line in open("sample.txt")]


#check if the content exactly matches any element in the list
def evaluate(text, board):
    if text in fileLineList:
        board.set("Correct")
    else:
        board.set("Incorrect")


def clear(content, result):
    content.set("")
    result.set("")


#build tkinter window    
root = Tk()
root.geometry("400x200")

content = StringVar()
result=StringVar()

#the entry widget to take user input
entry = Entry(root, textvariable=content)
entry.pack(fill=X, padx=10, pady=10)
entry.focus_set()

evalBtn = Button(root, text="Evaluate", 
         command=lambda: evaluate(text=content.get(), board=result))
evalBtn.pack(fill=X, padx=20, pady=10)

#label to show the result
lbl = Label(root, bg="white", textvariable=result)
lbl.pack(fill=X, padx=10, pady=10)

clearBtn = Button(root, text="Clear", 
         command=lambda: clear(content, result))
clearBtn.pack(fill=X, padx=20, pady=10)

root.mainloop()

Answer 2

您需要在单独的变量中跟踪当前行。试试这个：

import tkinter as tk
root = tk.Tk()

f = open('sentences.txt', 'r')
current_line = ''

def callback(*args):
    if sv.get() == current_line:
        print("correct")
    else:
        print("incorrect")

def next_line():
    global current_line
    current_line = next(f)
    label.config(text=current_line)

sv = tk.StringVar(root)
sv.trace("w", callback)

label = tk.Label(root,text="")
label.pack()
e = tk.Entry(root, textvariable=sv)
e.pack()
btn = tk.Button(root, text="Click for next", command=next_line)
btn.pack()

next_line() # autoload the first line of the file; remove this line to start with a blank

root.mainloop()

FWIW，尽量不要用lambda。它只会把你弄糊涂