Lecture Week 1 Wed 10/2

Announce results for Guess 1/2 of the average

# create a list of all number in 
# [1,100] that are divisible by 7
# how many of them

x = [1,2,3]

len(x)

3

x.append(4)

x

[1, 2, 3, 4]

x = []
for i in range(1,101):
    if i % 7 == 0:
        x.append(i)
print(x)

[7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98]

len(x)

14

divisible_by_7 = [number for number in range(1, 101) if number % 7 == 0]

divisible_by_7

[7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98]

x = [True, 1, 'hello']
# what is x[1]

x[0]

True

x[1]

1

x[2]

'hello'

x[-1]

'hello'

x = list(range(0,10))

x

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

x[1:9:2]

[1, 3, 5, 7]

a = [1,2,3]
b = a
b[1] = 100
a
# what is a

[1, 100, 3]

a.append(4)

b

[1, 100, 3, 4]

def fun(x):
    return x + 1

fun(3)

4

def fun_no_return(x):
    y = x + 1

print(fun_no_return(2))

None