How is Python 2 7 3 and Python 3 3 different

Question

What are the changes required for the same code written in Python 2.7.3 before and now it needs to be executed in Python 3.3?

The code is :-

nm = input(“enter your name “)

str = raw_input(“enter ur details: \n”)

f = open(nm,”w”)

f.write(str)

f.close()

print “1.See the file\n”

print “2.Exit\n”

s = input(“enter ur preference “)

if s == 1 :

   fi  = open(nm,”r”)

   cont  = fi.readlines()

for i in cont:

    print i

else :

    print “thank you, goodbye “ 

Please point out the changes to be made so that it runs without any error in Python 3.3

Answer 1

• raw_input() is not used in Python 3. Use input()  function such as-

  str = input("enter ur details: \n")

• input() cannot evaluate the value it parses in Python 3. for that you need to use eval(input()) such as :

  s = eval(input("enter ur preference "))

• print() is a function in Python 3 but it was a statement in Python 2. so it need to be called in the following way:

  print("1.See the file\n")
  print("2.Exit\n")
  
  print(i)
  
  print("thank you, goodbye")