title: Change Color Text with If-Else statements in Python
body: <p>So basically, this is my code: </p>
  
  <pre><code>#Imports Tk gui syntax
  from Tkinter import *
  
  #Creates App class
  class App(Tk):
  
      #Initiates class
      def __init__(self):
  
          #Initiates Tk
          Tk.__init__(self)
  
          #Creates title of app
          self.title("BMI Calculator")
  
          #adds extra line for a cleaner gui
          self.fillerLine = Label(self, text = "")
          self.fillerLine.grid(row=0, column=0)
  
          #asks user for height
          self.hgtOutput = Label(self, text = "What is your height (in inches)? :")
          self.hgtOutput.grid(row=1, column=0)
  
          #user inputs height in inches using a slider
          self.hgtInput = Scale(self, from_=0, to=96, orient=HORIZONTAL, length=450)
          self.hgtInput.pack()
          self.hgtInput.grid(row=1, column=1)
  
          #button asking user to confirm height
          self.btnConfirmHGT = Button(self, text = "Confirm Your Hegiht", command = self.confirmHGT)
          self.btnConfirmHGT.grid(row=3, column=0)
  
          #prints the height the user input in feet and inches
          self.printHGT = Label(self, text = "\n\n")
          self.printHGT.grid(row=3, column=1)
  
          #extra line for cleaner gui
          self.fillerLine = Label(self, text = "-------------------------------------------------------------------------------------")
          self.fillerLine.grid(row=4, column=0, columnspan=2)
  
          #asks user for weight in pounds
          self.wghtOutput = Label(self, text = "What is your weight (in pounds)? :")
          self.wghtOutput.grid(row=5, column=0)
  
          #user inputs weight using a slider
          self.wghtInput = Scale(self, from_=0, to=400, orient=HORIZONTAL, length=450)
          self.wghtInput.pack()
          self.wghtInput.grid(row=5, column=1)
  
          #button to start calculations
          self.btnCalc = Button(self, text = "Calculate", command = self.calculate)
          self.btnCalc.grid(row=6, columnspan=2)
  
          #extra line for cleaner gui
          self.fillerLine = Label(self, text = "---------------------------------------------")
          self.fillerLine.grid(row=7, column=0, columnspan=2)
  
          #prints users BMI
          self.tellBMI = Label(self, text = "")
          self.tellBMI.grid(row=8, column=0, columnspan=2)
  
          #prints what category the user is in, underweight, normal, overweight, obese
          self.catBMI = Label(self, text = "")
          self.catBMI.grid(row=9, column=0, columnspan=2)
  
          #extra line for cleaner gui
          self.fillerLine = Label(self, text = "---------------------------------------------")
          self.fillerLine.grid(row=10, column=0, columnspan=2)
  
          self.mainloop()
  
      #function to make sure the user put in the correct height
      def confirmHGT(self):
          feet = (self.hgtInput.get())/12
          inches = (self.hgtInput.get())%12
          #print the height the user input
          self.printHGT["text"] = "\nYou're height is : %s ft. &amp; %s in. \n" % (feet, inches)
  
      #function that calculates BMI and places it within a category
      def calculate(self):
          #Formula calculating BMI using the height and weight given by the user
          BMI = ((self.wghtInput.get()/float(self.hgtInput.get() ** 2))*703)
          #Prints users BMI
          self.tellBMI["text"] = "You're BMI is:\n %2.1f\n" % (BMI)
          #
          if BMI &lt; 18.5:
              self.catBMI["text"] = "Grab a cheeseburger! You are underweight."
          elif BMI &gt;= 18.5 and BMI &lt;= 24.9:
               self.catBMI["text"] = "Congratulations! You are normal!"
          elif BMI &gt;= 25.0 and BMI &lt;= 29.9:
               self.catBMI["text"] = "Maybe eat some salad! You are overweight."
          elif BMI &gt;= 30.0:
               self.catBMI["text"] = "Hit the treadmills! You are obese."
          else:
               pass
  
  #creates an instance of the App() class
  def main():
      a = App()
  
  #runs main() function
  if __name__ == "__main__":
    main()
  </code></pre>
  
  <p>The code runs perfectly fine for what I want to do, I'm just trying to make some minor improvements to learn. What I'm trying to do is, if BMI is in the underweight category, give the "Grab a cheeseburger! You are underweight." statement a yellow background. If in the normal category, give the "Congratulations! You are normal!" statement a green background. If in the overweight category, a yellow background, and the obese category a red background. All with keeping the normal background until the calculate button is pressed.</p>
  
  <p>I tried the,</p>
  
  <pre><code>tag_add()
  tag_config()
  </code></pre>
  
  <p>but I can't seem to figure it out, and don't know where to go next!</p>