7.py

'''Arithmetic operators
+	Addition	
-	Subtraction	
*	Multiplication
**	Exponential
/	Division
%	Modulus
//	Floor Division7'''
n = 15
m = 7
ans1 = n+m
print("Addition of",n,"and",m,"is", ans1)
ans2 = n-m
print("Subtraction of",n,"and",m,"is", ans2)
ans3 = n*m
print("Multiplication of",n,"and",m,"is", ans3)
ans4 = n/m
print("Division of",n,"and",m,"is", ans4)
ans5 = n%m
print("Modulus of",n,"and",m,"is", ans5)
ans6 = n//m
print("Floor Division of",n,"and",m,"is", ans6)

#Global and local variable
'''# Local Vs Global Variables

Variables may be either global or local:

 - Variables that are defined inside a function body have a local scope, and those defined outside have a global scope. 

 - This means that local variables can be accessed only inside the function in which they are declared, whereas global variables can be accessed throughout the program body by all functions.
   ### The global Keyword:

We only need to use the  **global keyword**  in a function if we want to assign or change the global variable instead of creating a local variable. 
global is not needed for printing and accessing. 
Python “assumes” that we want a local variable due to the assignment to a variable inside of a function. Any variable which is changed or created inside of a function is local if it hasn’t been declared as a global variable. To tell Python, that we want to use the global variable, we have to use the keyword  **global**, as can be seen in the following example:
'''
a = 1

# Uses global because there is no local 'a'
def f():
	print('Inside f() : ', a)

# Variable 'a' is redefined as a local
def g():
	a = 2
	print('Inside g() : ', a)

# Uses global keyword to modify global 'a'
def h():
	global a
	a = 3
	print('Inside h() : ', a)


# Global scope
print('global : ', a)
f()
print('global : ', a)
g()
print('global : ', a)
h()
print('global : ', a)