ItsCosmas

# USEFUL for extending functionality of functions you don't wanna modify

# this function takes a function as its parameter


def decorator(function):
    def wrap():
        print("Adding Printing Functionality")
        function()
        print("Adding Print Functionality")

ItsCosmas

def even_numbers(x):
    for i in range(x):
        if i % 2 == 0:
            yield i


for i in even_numbers(100):
    print(i)

ItsCosmas

# ASSERIONS
print(1)
assert 2 + 2 == 4
print(2)
assert 1 + 1 == 3
print(3)

# Assertions are often placed  at the start of a function to check for valid input
# and at the end to check for valid output

ItsCosmas

# RAISING EXCEPTIONS
print("Some Text")
raise ValueError
print("Something Else")

# Detail Exception
name = "1234"
raise NameError("Invalid Name")

# Raise in Except

ItsCosmas

try:
    word = "spam"
    print(word/0)
except:
    print("An Error Occured")
finally:
    print("This code will run no matter what errors")

ItsCosmas

try:
    num = "cos"
    num2 = 2
    div = num2/num
except ZeroDivisionError:
    print("An Error due to zero Division")
except (ValueError, TypeError):
    print("An Error occured")
else:
    print("The answer is: " + str(div))

ItsCosmas

try:
    num = "text"
    num2 = 2
    ans = num2/num
except TypeError:
    print("An Error occured: You cannot perfom division on a string.")
else:
    print("The answer is: " + str(ans))

ItsCosmas

for x in range(2, 30, 3):
    print(x)

ItsCosmas

for i in range(10):
    print(i)

ItsCosmas

numbers = list(range(5,20, 2))
print(numbers)