How to know if a user has pressed the Enter key using Python

Question

How to know if a user has pressed Enter using Python ?

For example :

user = raw_input(\"type in enter\")
if user == \"enter\":
    print \         


        

Answer 1

user_input=input("ENTER SOME POSITIVE INTEGER : ")
if((not user_input) or (int(user_input)<=0)):    
  print("ENTER SOME POSITIVE INTEGER GREATER THAN ZERO") #print some info
  import sys        #import
  sys.exit(0)       #exit program 
'''
#(not user_input) checks if user has pressed enter key without entering  
# number.
#(int(user_input)<=0) checks if user has entered any number less than or 
#equal to zero.
'''