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Python Crash Course¶

Please note, this is not meant to be a comprehensive overview of Python or programming in general, if you have no programming experience, you should probably take my other course: Complete Python Bootcamp instead.

This notebook is just a code reference for the videos, no written explanations here

This notebook will just go through the basic topics in order:

Data types
- Numbers
- Strings
- Printing
- Lists
- Dictionaries
- Booleans
- Tuples
- Sets
Comparison Operators
if, elif, else Statements
for Loops
while Loops
range()
list comprehension
functions
lambda expressions
map and filter
methods

Data types¶

Numbers¶

In [6]:

1 + 1

Out[6]:

In [7]:

1 * 3

Out[7]:

In [8]:

1 / 2

Out[8]:

0.5

In [9]:

2 ** 4

Out[9]:

In [10]:

4 % 2

Out[10]:

In [11]:

5 % 2

Out[11]:

In [12]:

(2 + 3) * (5 + 5)

Out[12]:

Variable Assignment¶

In [13]:

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

In [14]:

x = 2
y = 3

In [15]:

z = x + y

In [16]:

Out[16]:

Strings¶

In [17]:

'single quotes'

Out[17]:

'single quotes'

In [18]:

"double quotes"

Out[18]:

'double quotes'

In [19]:

" wrap lot's of other quotes"

Out[19]:

" wrap lot's of other quotes"

Printing¶

In [20]:

x = 'hello'

In [21]:

Out[21]:

'hello'

In [22]:

print(x)

hello

In [23]:

num = 12
name = 'Sam'

In [24]:

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

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

In [25]:

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

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

Lists¶

In [26]:

[1,2,3]

Out[26]:

[1, 2, 3]

In [27]:

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

Out[27]:

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

In [28]:

my_list = ['a','b','c']

In [29]:

my_list.append('d')

In [30]:

my_list

Out[30]:

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

In [31]:

my_list[0]

Out[31]:

'a'

In [32]:

my_list[1]

Out[32]:

'b'

In [33]:

my_list[1:]

Out[33]:

['b', 'c', 'd']

In [34]:

my_list[:1]

Out[34]:

['a']

In [35]:

my_list[0] = 'NEW'

In [98]:

my_list

Out[98]:

['NEW', 'b', 'c', 'd']

In [99]:

nest = [1,2,3,[4,5,['target']]]

In [100]:

nest[3]

Out[100]:

[4, 5, ['target']]

In [101]:

nest[3][2]

Out[101]:

['target']

In [102]:

nest[3][2][0]

Out[102]:

'target'

Dictionaries¶

In [37]:

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

In [38]:

Out[38]:

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

In [39]:

d['key1']

Out[39]:

'item1'

Booleans¶

In [40]:

True

Out[40]:

True

In [41]:

False

Out[41]:

False

Tuples¶

In [42]:

t = (1,2,3)

In [43]:

t[0]

Out[43]:

In [44]:

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¶

In [45]:

{1,2,3}

Out[45]:

{1, 2, 3}

In [46]:

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

Out[46]:

{1, 2, 3}

Comparison Operators¶

In [47]:

1 > 2

Out[47]:

False

In [48]:

1 < 2

Out[48]:

True

In [49]:

1 >= 1

Out[49]:

True

In [50]:

1 <= 4

Out[50]:

True

In [51]:

1 == 1

Out[51]:

True

In [52]:

'hi' == 'bye'

Out[52]:

False

Logic Operators¶

In [53]:

(1 > 2) and (2 < 3)

Out[53]:

False

In [54]:

(1 > 2) or (2 < 3)

Out[54]:

True

In [55]:

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

Out[55]:

True

if,elif, else Statements¶

In [56]:

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

Yep!

In [57]:

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

yep!

In [58]:

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

first

In [59]:

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

last

In [60]:

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

middle

for Loops¶

In [61]:

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

In [62]:

for item in seq:
    print(item)

In [63]:

for item in seq:
    print('Yep')

Yep
Yep
Yep
Yep
Yep

In [64]:

for jelly in seq:
    print(jelly+jelly)

while Loops¶

In [65]:

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()¶

In [66]:

range(5)

Out[66]:

range(0, 5)

In [67]:

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

In [68]:

list(range(5))

Out[68]:

[0, 1, 2, 3, 4]

list comprehension¶

In [69]:

x = [1,2,3,4]

In [70]:

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

[1, 4, 9, 16]

In [71]:

[item**2 for item in x]

Out[71]:

[1, 4, 9, 16]

functions¶

In [72]:

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

In [73]:

my_func

Out[73]:

<function __main__.my_func>

In [74]:

my_func()

default

In [75]:

my_func('new param')

new param

In [76]:

my_func(param1='new param')

new param

In [77]:

def square(x):
    return x**2

In [78]:

out = square(2)

In [79]:

print(out)

lambda expressions¶

In [80]:

def times2(var):
    return var*2

In [81]:

times2(2)

Out[81]:

In [82]:

lambda var: var*2

Out[82]:

<function __main__.<lambda>>

map and filter¶

In [83]:

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

In [84]:

map(times2,seq)

Out[84]:

<map at 0x105316748>

In [85]:

list(map(times2,seq))

Out[85]:

[2, 4, 6, 8, 10]

In [86]:

list(map(lambda var: var*2,seq))

Out[86]:

[2, 4, 6, 8, 10]

In [87]:

filter(lambda item: item%2 == 0,seq)

Out[87]:

<filter at 0x105316ac8>

In [88]:

list(filter(lambda item: item%2 == 0,seq))

Out[88]:

[2, 4]

methods¶

In [111]:

st = 'hello my name is Sam'

In [112]:

st.lower()

Out[112]:

'hello my name is sam'

In [113]:

st.upper()

Out[113]:

'HELLO MY NAME IS SAM'

In [103]:

st.split()

Out[103]:

['hello', 'my', 'name', 'is', 'Sam']

In [104]:

tweet = 'Go Sports! #Sports'

In [106]:

tweet.split('#')

Out[106]:

['Go Sports! ', 'Sports']

In [107]:

tweet.split('#')[1]

Out[107]:

'Sports'

In [92]:

Out[92]:

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

In [93]:

d.keys()

Out[93]:

dict_keys(['key2', 'key1'])

In [94]:

d.items()

Out[94]:

dict_items([('key2', 'item2'), ('key1', 'item1')])

In [95]:

lst = [1,2,3]

In [96]:

lst.pop()

Out[96]:

In [108]:

lst

Out[108]:

[1, 2]

In [109]:

'x' in [1,2,3]

Out[109]:

False

In [110]:

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

Out[110]:

True

32 KiB

Raw Blame History

Python Crash Course¶

Data types¶

Numbers¶

Variable Assignment¶

Strings¶

Printing¶

Lists¶

Dictionaries¶

Booleans¶

Tuples¶

Sets¶

Comparison Operators¶

Logic Operators¶

if,elif, else Statements¶

for Loops¶

while Loops¶

range()¶

list comprehension¶

functions¶

lambda expressions¶

map and filter¶

methods¶

Great Job!¶

32 KiB Raw Blame History

Python Crash Course¶

Data types¶

Numbers¶

Variable Assignment¶

Strings¶

Printing¶

Lists¶

Dictionaries¶

Booleans¶

Tuples¶

Sets¶

Comparison Operators¶

Logic Operators¶

if,elif, else Statements¶

for Loops¶

while Loops¶

range()¶

list comprehension¶

functions¶

lambda expressions¶

map and filter¶

methods¶

Great Job!¶

32 KiB

Raw Blame History