title: subset dataframe to show on GUI Tkinter
body: <p>I have dropdown option in tkinter which select the option of dropdown by groupby the col1 by dataframe pandas , Now I am able to see the subset of dataframe by clicking ok button in my terminal , I want to see the subset dataframe after selecting into dropdown in my GUI , 
  Please let me know how to see the subset dataframe a/c to dropdown option into my GUI . </p>
  
  <pre><code>import tkinter as tk
  import pandas as pd
  
  # --- functions ---
  
  def on_click():
  
      val = selected.get()
      if val == 'all':
          print(df)
      else:
          df2 = df[ df['TIME'] == val ]
          print(df2)
  
  
          def showdata():
  
              row, column = df2.shape
  
              for r in range(row):
                  for c in range(column):
                      e1 = tk.Entry(Frame1)
                      e1.insert(1, df2.iloc[r, c])
                      e1.grid(row=r, column=c, padx=2, pady=2)
                      e1.config(state='disabled')
                      # print(df.groupby(''))
                      # exit()
  
          Exitbutton = tk.Button(Frame1, text="EXIT", fg="red", bd=5, width=3, height=2, command=root.quit)
          Exitbutton.pack()
          #Exitbutton.grid(row=41, column=2)
          nextbutton = tk.Button(Frame1, text="Next Data", fg="red", bd=5, width=7, height=2,command=showdata)
          nextbutton.pack()
          #nextbutton.grid(row=41, column=3)
  
  
  
  
  # --- main ---
  
  df = pd.DataFrame({
      'TIME': ['00:00','00:00','01:00','01:00','02:00','02:00'],
      'A': ['a','b','c','d','e','f'],
      'B': ['x','x','y','y','z','z'],
  })
  
  root = tk.Tk()
  Frame1=tk.Frame(root,bd=5)
  
  values = ['all'] + list(df['TIME'].unique())
  selected = tk.StringVar()
  
  options = tk.OptionMenu(Frame1, selected, *values)
  options.pack()
  
  button = tk.Button(Frame1, text='OK', command=on_click)
  button.pack()
  button2 = tk.Button(Frame1, text='OK', command=on_click)
  button.pack()
  
  root.mainloop()
  </code></pre>
  
  <p>I am getting blank Tkinter Window , without using showdata function i am getting dropdown option and data are showing in terminal but i want the subset dataframe to display on GUI for that i created showdata() but it is not working. 
  Kindly let me know how to solve this issue , I will be appreciable </p>
  
  <p>** For more details on dropdown options show you can go below link 
  <a href="https://stackoverflow.com/questions/59890350/dropdown-option-to-show-subset-of-dataframe-tkinter">enter link description here</a></p>