Exceptions handling

Project4.py

##### FUNCTIONS IN PYTHON ###

def returning(a):
    return "I am a result!",a

returnedVal = returning(5)
print(returnedVal)          ## need to extract from brackets
def add(a,b=4,d=10):
    c = a + b + d
    return c

result1=add(10)
print(result1)

### SCOPE ###

def outer(a):

    def nested(x):
        return x*a;
    a = nested(a)
    return a

print(outer(5)) ##5*5


def f(a):
    def g(b):
        return a*b;
    return g

print(f(4)(24))

### RECUIRSIVE FUNCTIONS ###

def factorial(n):
    if n ==1:
        return 1
    else:
        return n* factorial(n-1)  # 5*4*3*2*1


print(factorial(5))


def tailSum (n,acuumulator=0):
    if n==0:
        return acuumulator
    else:
        print(n,acuumulator)
        return tailSum(n-1, acuumulator+n)


print(tailSum(5))

## LAMBDA

f = lambda a,b: a+b ## no return statement needed

print(f(2,3))

g = lambda a: lambda b, c: lambda d: (a * b * c * d)
print(g(5)(3,3)(2))


### EXCEPTION HANDLING ###

# try block

# try:
#     a=6/0
# except Exception as e:
#     print(e)
#
# try:
#      n = str(input("Enter an string: "))
# except ValueError:
#      print ("That is not an string")

# try:
#     n = int(input("Enter an integer: "))
# except ValueError:
#     print ("That is not an integer")
10
# try:
#     sum = 0
#     file = open('numbers.txt','r')
#     for number in file:
#         sum = sum +1.0/int(number)
#     print(sum)
# except ZeroDivisionError:
#     print("Number in file equals to zero")
# except IOError:
#     print('File DNE')

### THROWING EXCEPTION ###

a = 1

# def RaiseException(a):
#     if type(a) != type('a'):
#         raise ValueError("This is not string !")
# try:
#     RaiseException(a)
# except Exception as e:
#        print(e)

def TestCase( a, b):
    assert a < b, "a is a greater than b"
try:
    TestCase(32,4)
except AssertionError as e:
    print(e)