如何在Tkinter父级脚本中实现`input`方法，并将显示的提示和返回值发送回子脚本？

Question

我有两个脚本：

Processor_child.py：其目的是执行一些数据分析和清理操作。当单独运行时（不包括Tkinter_parent.py），它必须执行与使用Tkinter_parent.py打包到GUI中时相同的操作。

Tkinter_parent.py：它的目的是为那些无法直接使用Processor_child的用户提供GUI。

当我挣扎是从重现蟒蛇input功能Processor_child.py在这两个一起使用的GUI的实例。我需要向用户提供一个提示（在下面的代码中完成），将该响应传递给GUI（可用于此的各种选项，例如Pipe），并且只有在响应已通过后，Processor_child才能恢复其操作/检索入门价值（如何？）。该问题的

实施例的代码，用###注释###表示在需要插入以执行期望的功能的代码：

### Processor_child.py ### 
import pandas as pd 

def smart_print(message, a_pipe = None): 
    if __name__ == "__main__": 
     print(message) 
    else: 
     a_pipe.send(message) 

def review_with_user(var_names, dataset, a_pipe = None): 
    affirmed = [] 
    review_message = 'Yes or no?' 

    if __name__ == "__main__": 
     review_response = input(review_message) 
    else: 
     smart_print(review_message, a_pipe) 
     review_response = 'Yes' ### INSTEAD SOMEHOW GET RESPONSE FROM Tkinter_parent.py ### 

    if review_response in ['Yes', 'yes']: 
     for v in set(var_names): 
      smart_print(dataset[v].dropna()[:8], a_pipe) 
      if __name__ == "__main__": 
       local_response = input(review_message) 
      else: 
       local_response = None ### INSTEAD SOMEHOW GET RESPONSE FROM Tkinter_parent.py ### 
      if local_response in ['Yes', 'yes']: 
       affirmed.append(v) 

if __name__ == "__main__": 
    var_names = ['var1', 'var2'] 
    df = pd.read_csv('dummy.csv') 
    review_with_user(var_names, df) 

而且Tkinter_parent.py：

### Tkinter_parent.py ### 
from tkinter import * 
from tkinter.filedialog import askopenfilename 
from tkinter import ttk 
from multiprocessing import Process, Pipe 
import pandas as pd 
import Processor_child 

class GUI: 
    def __init__(self, master): 
     self.master = master 

def gui_input(message): 
    def input_done(event=None): 
     ### INSTEAD SOMEHOW send entry.get() back to Processor_child.py ### 
     pass 

    entry = Entry(frame) 
    input_label = ttk.Label(frame, text=message) 
    entry.bind("<Return>", input_done) 
    submit_button = ttk.Button(frame, text="Submit", command=input_done) 
    input_label.pack() 
    entry.pack() 
    submit_button.pack() 

def file_select(): 
    dataset_path = askopenfilename() 

    if __name__ == '__main__': 
     pipe1, pipe2 = Pipe() 

     some_vars = ['a var', 'another var'] 
     a_df = pd.read_csv(dataset_path) 

     p_review = Process(target=Processor_child.review_with_user, args=(some_vars, a_df, pipe2)) 
     p_review.start() 

     gui_input(pipe1.recv()) 

if __name__ == '__main__': 
    root = Tk() 
    my_gui = GUI(root) 
    root.style = ttk.Style() 
    root.style.configure('my.TButton') 
    root.style.configure('my.TLabel') 

    canvas = Canvas(root) 
    frame = Frame(canvas) 
    frame.place() 
    canvas.pack(side="left", fill="both", expand=True) 
    canvas.create_window((45,50), window=frame, anchor="nw") 

    ttk.Button(frame, text="Select", command=file_select).pack() 

    root.mainloop() 

我我们已经回顾了SO上的一些相关问题，如 Getting a TKinter input stored into a string variable in the next function?：但它们不适用于在执行其他操作之前等待输入的情况（如我在此处介绍的两种情况）。

其他SO问题如How do I make the program wait for an input using an Entry box in Python GUI?在这些情况下不起作用，其中嵌入在另一个脚本的执行功能内的循环内的输入;他们依靠在GUI脚本本身内完成的“等待”。

Answer 1

注意：这只适用于极少数情况。这不是一个真正的“解决方案”......我仍然面临这个问题。固定方法如下都有自己的SO问题：Tkinter application 'freezes' while continually polling Pipe for contents (multiprocessing)

---

我已经能够找到一个伪解决方案我在其中添加while循环，即poll的Pipe，并在发现该Pipe确实包含内容，请求Pipe中的数据。这些while循环很容易使应用程序超载，而且似乎只能用于简化的情况。绝对不是最好的方法。

见修改代码：

### processor_child.py ### 
import pandas as pd 
from multiprocessing import * 
import time 

def smart_print(message, a_pipe = None): 
    if __name__ == "__main__": 
     print(message) 
    else: 
     a_pipe.send(message) 

def review_with_user(var_names, dataset, a_pipe = None): 
    affirmed = [] 
    review_message = 'Yes or no?' 

    if __name__ == "__main__": 
     review_response = input(review_message) 
    else: 
     smart_print(review_message, a_pipe) 
     while a_pipe.poll() != True: 
      time.sleep(0.1) 

     review_response = a_pipe.recv() 

    if review_response in ['Yes', 'yes']: 
     for v in dataset.columns: 
      smart_print(dataset[v].dropna(), a_pipe) 
      if __name__ == "__main__": 
       local_response = input(review_message) 
      else: 
       while a_pipe.poll() != True: 
        time.sleep(0.1) 
       local_response = a_pipe.recv() 
      if local_response in ['Yes', 'yes']: 
       affirmed.append(v) 

     smart_print(affirmed, a_pipe) 

if __name__ == "__main__": 
    var_names = ['var1', 'var2'] 
    df = pd.read_csv('dummy.csv') 
    review_with_user(var_names, df) 

而且Tkinter_parent.py：

### Tkinter_parent.py ### 
from tkinter import * 
from tkinter.filedialog import askopenfilename 
from tkinter import ttk 
from multiprocessing import Process, Pipe 
import pandas as pd 
import Processor_child 
import time 

class GUI: 
    def __init__(self, master): 
     self.master = master 

def gui_input(message, a_pipe = None): 
    def input_done(event=None): 
     entry.pack_forget() 
     input_label.pack_forget() 
     submit_button.pack_forget() 
     a_pipe.send(entry.get()) 
     next_one(a_pipe) 

    entry = Entry(frame) 
    input_label = ttk.Label(frame, text=message) 
    entry.bind("<Return>", input_done) 
    submit_button = ttk.Button(frame, text="Submit", command=input_done) 
    input_label.pack() 
    entry.pack() 
    submit_button.pack() 

def file_select(): 
    dataset_path = askopenfilename() 

    if __name__ == '__main__': 
     pipe1, pipe2 = Pipe() 

     some_vars = ['a var', 'another var'] 
     a_df = pd.read_csv(dataset_path) 

     p_review = Process(target=Processor_child.review_with_user, args=(some_vars, a_df, pipe2)) 
     p_review.start() 

     gui_input(pipe1.recv(), pipe1) 

     #time.sleep(1) 
def next_one(pipe1): 
    while pipe1.poll() != True: 
     time.sleep(0.1) 

    gui_input(pipe1.recv(), pipe1) 

if __name__ == '__main__': 
    root = Tk() 
    my_gui = GUI(root) 
    root.style = ttk.Style() 
    root.style.configure('my.TButton') 
    root.style.configure('my.TLabel') 

    canvas = Canvas(root) 
    frame = Frame(canvas) 
    frame.place() 
    canvas.pack(side="left", fill="both", expand=True) 
    canvas.create_window((45,50), window=frame, anchor="nw") 

    ttk.Button(frame, text="Select", command=file_select).pack() 

    root.mainloop()