How to add for loops in python, in order to not to write the same thing all over? -

name = raw_input("please enter name, know how address you!" " ")  semester = int(raw_input("nice meet you" + " " + name + ", " + "please tell me, how many semesters have completed?" " "))      if semester == 1 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      = float(num1)/1      if >= 3.5 :          print "good job " + name + ", " + "your gpa great!"      if > 3 , <3.5 :          print "nice, sure can better," + " " + name + "."      if <= 3 , > 2 :          print name + " " + "don't give up! should try harder!"      if <= 2 :          print name + " " + "you better work harder, or on probation!"      print name + "'s" + " overall gpa is" + " " + str(a)    elif semester == 2 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      = float(num1 + num2)/2      if >= 3.5 :          print "good job " + name + ", " + "your gpa great!"      if > 3 , <3.5 :          print "nice, sure can better," + " " + name + "."      if <= 3 , > 2 :          print name + " " + "don't give up! should try harder!"      if <= 2 :          print name + " " + "you better work harder, or on probation!"      print name + "'s" + " overall gpa is" + " " + str(a)    elif semester == 3 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      = float(num1 + num2 + num3)/3      if >= 3.5 :          print ("good job " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    elif semester == 4 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      num4 = float(input("enter 4-th semester gpa: "))      = float(num1 + num2 + num3 + num4)/4      if >= 3.5 :          print ("good job " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    elif semester == 5 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      num4 = float(input("enter 4-th semester gpa: "))      num5 = float(input("enter 5-th semester gpa: "))      = float(num1 + num2 + num3 + num4 + num5)/5      if >= 3.5 :          print ("good job " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    elif semester == 6 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      num4 = float(input("enter 4-th semester gpa: "))      num5 = float(input("enter 5-th semester gpa: "))      num6 = float(input("enter 6-th semester gpa: "))      = float(num1 + num2 + num3 + num4 + num5 + num6)/6      if >= 3.5 :          print ("good job " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    elif semester == 7 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      num4 = float(input("enter 4-th semester gpa: "))      num5 = float(input("enter 5-th semester gpa: "))      num6 = float(input("enter 6-th semester gpa: "))      num7 = float(input("enter 7-th semester gpa: "))      = float(num1 + num2 + num3 + num4 + num5 + num6 + num7)/7      if >= 3.5 :          print ("good job, " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    elif semester == 8 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))      num2 = float(input("enter 2-nd semester gpa: "))      num3 = float(input("enter 3-rd semester gpa: "))      num4 = float(input("enter 4-th semester gpa: "))      num5 = float(input("enter 5-th semester gpa: "))      num6 = float(input("enter 6-th semester gpa: "))      num7 = float(input("enter 7-th semester gpa: "))      num8 = float(input("enter 8-th semester gpa: "))      = float(num1 + num2 + num3 + num4 + num5 + num6 + num7 + num8)/8      if >= 3.5 :          print ("good job, " + name + ", " + "your gpa great!")      if > 3 , <3.5 :          print ("nice, sure can better," + " " + name + ".")      if <= 3 , > 2 :          print (name + " " + "don't give up! should try harder!")      if <= 2 :          print (name + " " + "you better work harder, or on probation!")      print(name + "'s" + " overall gpa is" + " " + str(a))    else:      print "please enter valid semester number e.g. 1,2,3,...7,8"    import sys  while true:      print('type q exit.')      response = input()      if response == 'q':          sys.exit()          print('you typed ' + response + '.') 

ok, let's step step:

1. using functions avoid dublicated code

you're using exact same code printing output message, should become function.

def print_response(name, a):     if >= 3.5 :         print ("good job, " + name + ", " + "your gpa great!")     if > 3 , <3.5 :         print ("nice, sure can better," + " " + name + ".")     if <= 3 , > 2 :         print (name + " " + "don't give up! should try harder!")     if <= 2 :         print (name + " " + "you better work harder, or on probation!")     print(name + "'s" + " overall gpa is" + " " + str(a)) 

using function improves code, see below:

name = raw_input("please enter name, know how address you!" " ") semester = int(raw_input("nice meet you" + " " + name + ", " + "please tell me, how many semesters have completed?" " "))  def print_response(a):     if >= 3.5 :         print ("good job, " + name + ", " + "your gpa great!")     if > 3 , <3.5 :         print ("nice, sure can better," + " " + name + ".")     if <= 3 , > 2 :         print (name + " " + "don't give up! should try harder!")     if <= 2 :         print (name + " " + "you better work harder, or on probation!")     print(name + "'s" + " overall gpa is" + " " + str(a))  if semester == 1 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     = float(num1)/1     print_response(a)  elif semester == 2 :      num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     = float(num1 + num2)/2     print_response(a)  elif semester == 3 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     = float(num1 + num2 + num3)/2     print_response(a)  elif semester == 4 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     num4 = float(input("enter 4-th semester gpa: "))     = float(num1 + num2 + num3 + num4)/4     print_response(a)  elif semester == 5 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     num4 = float(input("enter 4-th semester gpa: "))     num5 = float(input("enter 5-th semester gpa: "))     = float(num1 + num2 + num3 + num4 + num5)/5     print_response(a)  elif semester == 6 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     num4 = float(input("enter 4-th semester gpa: "))     num5 = float(input("enter 5-th semester gpa: "))     num6 = float(input("enter 6-th semester gpa: "))     = float(num1 + num2 + num3 + num4 + num5 + num6)/6     print_response(a)  elif semester == 7 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     num4 = float(input("enter 4-th semester gpa: "))     num5 = float(input("enter 5-th semester gpa: "))     num6 = float(input("enter 6-th semester gpa: "))     num7 = float(input("enter 7-th semester gpa: "))     = float(num1 + num2 + num3 + num4 + num5 + num6 + num7)/7     print_response(a)  elif semester == 8 :     num1 = float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     num2 = float(input("enter 2-nd semester gpa: "))     num3 = float(input("enter 3-rd semester gpa: "))     num4 = float(input("enter 4-th semester gpa: "))     num5 = float(input("enter 5-th semester gpa: "))     num6 = float(input("enter 6-th semester gpa: "))     num7 = float(input("enter 7-th semester gpa: "))     num8 = float(input("enter 8-th semester gpa: "))     = float(num1 + num2 + num3 + num4 + num5 + num6 + num7 + num8)/8     print_response(a)  else:     print "please enter valid semester number e.g. 1,2,3,...7,8"   import sys while true:     print('type q exit.')     response = input()     if response == 'q':         sys.exit()         print('you typed ' + response + '.') 

2. using loop

you can avoid typing code each number of semesters using loop:

name = raw_input("please enter name, know how address you!" " ") semester = int(raw_input("nice meet you" + " " + name + ", " + "please tell me, how many semesters have completed?" " "))  def print_response(a):     if >= 3.5 :         print ("good job, " + name + ", " + "your gpa great!")     if > 3 , <3.5 :         print ("nice, sure can better," + " " + name + ".")     if <= 3 , > 2 :         print (name + " " + "don't give up! should try harder!")     if <= 2 :         print (name + " " + "you better work harder, or on probation!")     print(name + "'s" + " overall gpa is" + " " + str(a))  if semester > 8 or semester < 1:     print "please enter valid semester number e.g. 1,2,3,...7,8" else:     grade_sum = 0     grade_sum += float(input("ok" + " " + name + ", " + "please enter 1-st semester gpa: "))     in range(2, semester+1):         suffix = "-nd" if == 2 else "-rd" if == 3 else "-st"         grade_sum += float(input("enter {}{} semester gpa: ".format(i, suffix)))      = grade_sum / semester     print_response(a)   import sys while true:     print('type q exit.')     response = input()     if response == 'q':         sys.exit()         print('you typed ' + response + '.')