Python Program-3

(3) Develop programs to learn concept of
1) Functions Scoping, 2) An example of a Recursive Function to find the factorial of a number and3) List Mutability: A) Copying Mutable Objects by Reference B) Copying Immutable Objects C) Immutable Object Changing Its Value

Program Code:

# LAB-3   function scoping
a='string (Global)'   #global
def func1():
    a='string within the function (Local)' #local
    print("print from func1:",a)
func1()
#here variable a within a the function is printed
print("print from outside:",a)


#while here, variable outside the function is printed
def func2():
    global b 
    b = "global string"
func2()
print("print from outside:", b)
#this is possible because string is declared global
print()




#recursion
# An example of a recursive function to  # find the factorial of a number

def calc_factorial(x):
    """This is a recursive function
    to find the factorial of an integer"""

    if x == 1:
        return 1
    else:
        return (x * calc_factorial(x-1))

num = 5
print("The factorial of", num, "is=", calc_factorial(num))




#Lab-3
#Copying Mutable Objects by Reference

values = [4, 5, 6]
values2 = values
print("Memory Address=",id(values))
print("Memory Address=",id(values2))

values.append(7)
print(values is values2)
print(values)
print(values2)

#Copying Immutable Objects
text = "Python"
text2 = text
print("Memory Address=",id(text))
print("Memory Address=",id(text2))
print(text is text2)
print()

text += " is awesome"
print("Memory Address=",id(text))
print("Memory Address=",id(text2))
print(text is text2)
print()

print(text)
print(text2)


#Immutable Object Changing Its Value

skills = ["Programming", "PRIME", "GTU"]
person = (129392130, skills)
print(type(person))
print(person)

skills[2] = "Maths"

print(person)

Output: