Data types

Numbers 

1 + 1

2
1 * 3

3
1 / 2

0.5
2 ** 4

16
4 % 2

0
5 % 2

1
(2 + 3) * (5 + 5)

50

Variable Assignment 

# Can not start with number or special characters
name_of_var = 2

x = 2
y = 3

z = x + y

z

5

Strings 

'single quotes'

'single quotes'
"double quotes"

'double quotes'
" wrap lot's of other quotes"

" wrap lot's of other quotes"

Printing 

x = 'hello'

x

'hello'
print(x)

hello

num = 12
name = 'Sam'

print('My number is: {one}, and my name is: {two}'.format(one=num,two=name))

My number is: 12, and my name is: Sam

print('My number is: {}, and my name is: {}'.format(num,name))

My number is: 12, and my name is: Sam

Lists 

[1,2,3]

[1, 2, 3]
['hi',1,[1,2]]

['hi', 1, [1, 2]]
my_list = ['a','b','c']

my_list.append('d')

my_list

['a', 'b', 'c', 'd']
my_list[0]

'a'
my_list[1]

'b'
my_list[1:]

['b', 'c', 'd']
my_list[:1]

['a']
my_list[0] = 'NEW'

my_list

['NEW', 'b', 'c', 'd']
nest = [1,2,3,[4,5,['target']]]

nest[3]

[4, 5, ['target']]
nest[3][2]

['target']
nest[3][2][0]

'target'

Dictionaries 

d = {'key1':'item1','key2':'item2'}

d

{'key1': 'item1', 'key2': 'item2'}
d['key1']

'item1'

Booleans 

True

True
False

False

Tuples 

t = (1,2,3)

t[0]

1
t[0] = 'NEW'

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-44-97e4e33b36c2> in <module>()
----> 1 t[0] = 'NEW'

TypeError: 'tuple' object does not support item assignment

Sets 

{1,2,3}

{1, 2, 3}
{1,2,3,1,2,1,2,3,3,3,3,2,2,2,1,1,2}

{1, 2, 3}

Comparison Operators 

1 > 2

False
1 < 2

True
1 >= 1

True
1 <= 4

True
1 == 1

True
'hi' == 'bye'

False

Logic Operators 

(1 > 2) and (2 < 3)

False
(1 > 2) or (2 < 3)

True
(1 == 2) or (2 == 3) or (4 == 4)

True

if,elif, else Statements 

if 1 < 2:
    print('Yep!')

Yep!

if 1 < 2:
    print('yep!')

yep!

if 1 < 2:
    print('first')
else:
    print('last')

first

if 1 > 2:
    print('first')
else:
    print('last')

last

if 1 == 2:
    print('first')
elif 3 == 3:
    print('middle')
else:
    print('Last')

middle

for Loops 

seq = [1,2,3,4,5]

for item in seq:
    print(item)

1
2
3
4
5

for item in seq:
    print('Yep')

Yep
Yep
Yep
Yep
Yep

for jelly in seq:
    print(jelly+jelly)

2
4
6
8
10

while Loops 

i = 1
while i < 5:
    print('i is: {}'.format(i))
    i = i+1

i is: 1
i is: 2
i is: 3
i is: 4

range() 

range(5)

range(0, 5)
for i in range(5):
    print(i)

0
1
2
3
4

list(range(5))

[0, 1, 2, 3, 4]

list comprehension 

x = [1,2,3,4]

out = []
for item in x:
    out.append(item**2)
print(out)

[1, 4, 9, 16]

[item**2 for item in x]

[1, 4, 9, 16]

functions 

def my_func(param1='default'):
    """
    Docstring goes here.
    """
    print(param1)

my_func

<function __main__.my_func>
my_func()

default

my_func('new param')

new param

my_func(param1='new param')

new param

def square(x):
    return x**2

out = square(2)

print(out)

4

lambda expressions 

def times2(var):
    return var*2

times2(2)

4
lambda var: var*2

<function __main__.<lambda>>

map and filter 

seq = [1,2,3,4,5]

map(times2,seq)

<map at 0x105316748>
list(map(times2,seq))

[2, 4, 6, 8, 10]
list(map(lambda var: var*2,seq))

[2, 4, 6, 8, 10]
filter(lambda item: item%2 == 0,seq)

<filter at 0x105316ac8>
list(filter(lambda item: item%2 == 0,seq))

[2, 4]

methods 

st = 'hello my name is Sam'

st.lower()

'hello my name is sam'
st.upper()

'HELLO MY NAME IS SAM'
st.split()

['hello', 'my', 'name', 'is', 'Sam']
tweet = 'Go Sports! #Sports'

tweet.split('#')

['Go Sports! ', 'Sports']
tweet.split('#')[1]

'Sports'
d

{'key1': 'item1', 'key2': 'item2'}
d.keys()

dict_keys(['key2', 'key1'])
d.items()

dict_items([('key2', 'item2'), ('key1', 'item1')])
lst = [1,2,3]

lst.pop()

3
lst

[1, 2]
'x' in [1,2,3]

False
'x' in ['x','y','z']

True

Great Job!