# Python code to demonstrate working of # in and is # using 'in' to check  if 's' in 'geeksforgeeks': print ('s is part of geeksforgeeks') else : print ('s is not part of geeksforgeeks') # using 'in' to loop through for i in 'geeksforgeeks': print (iend=' ') print ('r') # using is to check object identity # string is immutable( cannot be changed once allocated) # hence occupy same memory location print (' ' is ' ') # using is to check object identity # dictionary is mutable( can be changed once allocated) # hence occupy different memory location print ({} is {}) 

# Python code to demonstrate working of # global and non local #initializing variable globally a = 10 # used to read the variable def read(): print (a) # changing the value of globally defined variable def mod1(): global a a = 5 # changing value of only local variable def mod2(): a = 15 # reading initial value of a # prints 10 read() # calling mod 1 function to modify value # modifies value of global a to 5 mod1() # reading modified value # prints 5 read() # calling mod 2 function to modify value # modifies value of local a to 15 doesn't effect global value mod2() # reading modified value # again prints 5 read() # demonstrating non local  # inner loop changing the value of outer a # prints 10 print ('Value of a using nonlocal is : 'end='') def outer(): a = 5 def inner(): nonlocal a a = 10 inner() print (a) outer() # demonstrating without non local  # inner loop not changing the value of outer a # prints 5 print ('Value of a without using nonlocal is : 'end='') def outer(): a = 5 def inner(): a = 10 inner() print (a) outer()