5/0

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
/tmp/ipykernel_3381/2874912419.py in <module>
----> 1 5/0

ZeroDivisionError: division by zero

'hi'*2

'hihi'

'hihi'/2

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_3381/2892899560.py in <module>
----> 1 'hihi'/2

TypeError: unsupported operand type(s) for /: 'str' and 'int'

def half(sequence):
    result=[]
    for element in sequence:
        result=result+[element/2]
    return result

half([12, 16, 20])

[6.0, 8.0, 10.0]

why now it doesn't need result+???

def exclaim(sequence):
    result=[]
    for element in sequence:
        result=result+[element+'!']
    return result
    

exclaim(['hello','world'])

['hello!', 'world!']

exclaim(['hello', '2', 'true'])

['hello!', '2!', 'true!']

def has_no_elements(sequence):
    if sequence==([]):
        return True
    else:
        return False

has_no_elements([1])

False

has_no_elements([])

True

def sum_three(first,second,third):
    result=()
    result=first+second+third
    return result

sum_three(1,2,3)

6

sum_three(6,45,8)

59

def ten_times_each(sequence):
    result=[]
    for element in sequence:
        result=result+[element*10]
    return result

ten_times_each([15])

[150]

def positive(sequence):
    result=[]
    for n in sequence:
        result=result+[n==0]
    return result

positive(1,4,-1)    

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_3381/3036314541.py in <module>
----> 1 positive(1,4,-1)

TypeError: positive() takes 1 positional argument but 3 were given

def one_third(sequence):
    result=[]
    for element in sequence:
        result=result+[element/3]
    return result

one_third([3])

[1.0]

one_third([15])

[5.0]

def add_half(sequence):
    result=[]
    for element in sequence:
        result=result+[element+element/2]
    return result

add_half([5])

[7.5]

add_half([46])

[69.0]