s = "string"          
print(s[0:2])        # st
print(s[:3])         # str
print(s[3:])         # ing
s2 = "one"          
 
print("Write " + 2*s2 + " " + s)                # Write oneone string
print("hello %s, lab %d  !" % ("students",1))   # hello students, lab 1  !             
 
import string
print("hello {}, lab {}".format("world",1))     # hello world, lab 1
print("hello {0}, lab {1}".format("world",1))   # incepand cu python 2.6