title: checking if a variable is an integer or not on python
body: <p>I am making a maths test using tkinter. I have 4 entries to allow the user to input the answers of questions. the answers must be in integer format if not it will give a long error. I wanted my program to check if the inputted value is an integer or not.and then if it is not an integer open up a message box telling the user to check the answers.</p>
  
  <p>here is my code: (it's a long code because I didn't know how to shorten it, I'm not a programmer)</p>
  
  <pre><code>from tkinter import*
  from tkinter import messagebox
  from random import*
  
  
  
  
  n1= randint(1,6)
  n2= randint(1,9)
  ques1 = n1, "x", n2, "="
  c1= n1*n2
  
  n1= randint(8,15)
  n2= randint(1,7)
  ques2 = n1, "-", n2, "="
  c2= n1-n2
  
  n1= randint(1,10)
  n2= randint(5,15)
  ques3 = n1, "+", n2, "="
  c3= n1+n2
  
  n1= randint(5,12)
  n2= randint(1,10)
  ques4 = n1, "x", n2, "="
  c4= n1*n2
  
  #window
  window = Tk()
  window.geometry("280x450")
  window.title("quiz")
  window.configure(background='yellow')
  
  def checkthrough():
      if ans1.get() == '':
          messagebox.showinfo("error", "check again ")
      elif ans2.get() == '':
          messagebox.showinfo("error", "check again ")
      elif ans3.get() == '':
          messagebox.showinfo("error", "check again ")
      elif ans4.get() == '':
          messagebox.showinfo("error", "check again ")
      else:
          save()
      #this is where i tried to check if it's an integer or not
      try:
          ans1 == int()
      except:
          messagebox.showinfo("error", "check again ")
  
  
  def save():
      score = 0
      if c1==int(ans1.get()): 
          score= score + 1
      if c2==int(ans2.get()):
          score = score+1
      if c3==int(ans3.get()):
          score = score+1
      if c4==int(ans4.get()):
          score = score+1
      fscore.set(score)
  
  
  
  def savetofile():
      result = result ="\n "+ namestudent.get() + "            " + fscore.get()+"/4"
      messagebox.showinfo("results", "your results been saved successfuly")
      if int(year.get())==1:
          f = open('results C1.txt', 'a')
          f.write(result)
          f.close()
      if int(year.get())==2:
          f = open('results C2.txt', 'a')
          f.write(result)
          f.close()
      if int(year.get())==3:
          f = open('results C3.txt', 'a')
          f.write(result)
          f.close()
  
  
  #frame
  frame = Frame(window)
  frame.columnconfigure(0, weight=1)
  frame.rowconfigure(0, weight=1)
  
  
  #variables
  namestudent = StringVar()
  ans1 = StringVar()
  ans2 = StringVar()
  ans3 = StringVar()
  ans4 = StringVar()
  fscore = StringVar()
  year = StringVar()
  
  #labels
  name = Label(window, text = "type your name:")
  name.grid(row= 6, column = 0)
  
  yr = Label(window, text = "type your class:")
  yr.grid(row= 7, column = 0)
  
  q1 = Label(window,text = ques1, height = 3, bg = 'yellow')
  q1.grid(row = 1,column=0)
  
  q2 = Label(window,text = ques2, height = 3, bg = 'yellow')
  q2.grid(row = 2,column=0)
  
  q3 = Label(window,text = ques3, height = 3, bg = 'yellow')
  q3.grid(row = 3,column=0)
  
  q4 = Label(window,text = ques4, height = 3, bg = 'yellow')
  q4.grid(row = 4,column=0)
  
  #entrys
  name_entry= Entry(window, textvariable= namestudent)
  name_entry.grid(row = 6, column=1)
  
  yr_entry= Entry(window, textvariable= year)
  yr_entry.grid(row = 7, column=1)
  
  q1_entry = Entry(window, width = 6, textvariable = ans1)
  q1_entry.grid(row = 1,column=1)
  
  q2_entry = Entry(window, width = 6, textvariable = ans2)
  q2_entry.grid(row = 2,column=1)
  
  q3_entry = Entry(window, width = 6, textvariable = ans3)
  q3_entry.grid(row = 3,column=1)
  
  q4_entry = Entry(window, width = 6, textvariable = ans4)
  q4_entry.grid(row = 4,column=1)
  
  #buttons
  
  finish = Button(window, width = 5, text = "finish",command= checkthrough)
  finish.grid(row = 5,column=0)
  
  finalS_label = Label(window, textvariable=fscore)
  finalS_label.grid(row=5, column=1)
  
  saving = Button(window, width = 5, text = "save", command= savetofile)
  saving.grid(row= 8, column=0)
  
  
  window.mainloop()
  </code></pre>
  
  <p>I read some other post about the same question and I tried to use their answers in my code but still I'm getting the same error.</p>
  
  <p>thanks.</p>