python - Why does my code continue? -

this code supposed take user input type of shape. take input of height print shape made of *'s (triangle/square now)

the code works until user types in bad input start, correct function name , tries close it. ideas how fix it?

error:

enter shape draw (q quit): sad unknown shape. please try again enter shape draw (q quit): triangle enter size: 6 * ** *** **** ***** ****** enter shape draw (q quit): q goodbye enter size: #this should not there 

the whole code """ shape programme jordan hampson"""

def main():     """main boss function"""     shape = input("enter shape draw (q quit): ").lower()      if shape == "q":         print("goodbye")         return        else:         get_valid_shape(shape)          call_shape(shape)          main()    def call_shape(shape):     """calls shape"""      size = int(input("enter size: "))     get_valid_size(size)     if shape == "square":         return print_square(size)      elif shape == "triangle":         return print_triangle(size)      else:          return main()   def get_valid_size(size):     """checks see if size valid"""     if size <= 0:         print("value must @ least 1")         main()  def get_valid_shape(shape):     """gets valid shape"""     shape_1 = shape     shapes = ["square", "triangle", "q"]     while shape_1 not in shapes:         print("unknown shape. please try again")         return main()   def print_square(size):     """prints square input"""     _ in range(0, size):         print(size * "*")   def print_triangle(size):      """prints triangle in *'s"""        _ in range(1, size +1):         print((size -(size -_)) * "*")    main() 

it's due fonction get_valid_shape(), fonction call fonction main() when enter "sad" start new main() in fonction get_valid_shape() (on main process still @ line get_valid_shape(shape)). when press "q" quit line , pass call_shape(shape) prevous shape triangle ask input size.

to avoid suggest code

def main():     shape = ""     while shape != "q":         """main boss function"""         shape = "" #reinitialize          shape = input("enter shape draw (q quit): ").lower()          if shape == "q":             print("goodbye")          elif get_valid_shape(shape) :             call_shape(shape)          else:             print("unknown shape. please try again")    def call_shape(shape):     """calls shape"""      size = int(input("enter size: "))#ask 1st time withour print error message     while get_valid_size(size): #while size false, ask again         size = int(input("enter size: "))      if shape == "square":         return print_square(size)      elif shape == "triangle":         return print_triangle(size)    def get_valid_size(size):     """checks see if size valid"""     if size <= 0:          print("value must @ least 1")         return true #return true loop @ while     else :         return false #return false break while  def get_valid_shape(shape):     """gets valid shape"""     shape_1 = shape     shapes = ["square", "triangle", "q"]     if shape_1 not in shapes:         return false     else :         return true   def print_square(size):     """prints square input"""     _ in range(0, size):         print(size * "*")   def print_triangle(size):      """prints triangle in *'s"""        _ in range(1, size +1):         print((size -(size -_)) * "*")    main() 

i suggest module pdb in python. it's debug module useful (you can see how run algorithme step step, go somewhere, function etc ...) link