In [1]:

    

d = {'key1':'major', 'key2':123}


    

In [2]:

    

d['key1']


    

    
Out[2]:





'major'

In [6]:

    

d = {'k1':['major','key','bruhh']}


    

In [5]:

    

d['k1'][1]


    

    
Out[5]:





'key'

In [7]:

    

True


    

    
Out[7]:





True

In [8]:

    

False


    

    
Out[8]:





False

In [10]:

    

my_list = [1,2,3] # this is a list. items are not unique and they can be reassigned.


    

In [12]:

    

my_list[1] # grabbing an item using indexing


    

    
Out[12]:





2

In [14]:

    

tup = (1,2,3) # this is a tuple. items are immutable.


    

In [19]:

    

tup[0] = 4


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-19-945dcde76e56> in <module>()
----> 1 tup[0] = 4

TypeError: 'tuple' object does not support item assignment

In [16]:

    

{1,2,3} #this is a set


    

    
Out[16]:





{1, 2, 3}

In [18]:

    

{1,2,3,3,2,1} # set items are unique


    

    
Out[18]:





{1, 2, 3}

In [28]:

    

s = set([1,2,1,2,1,2,2,2,2,2,2]) # converting a list to a set gets rid of duplicates
s.add(5)
s


    

    
Out[28]:





{1, 2, 5}

In [29]:

    

s.add(5) # adding an existing value won't change the set
s


    

    
Out[29]:





{1, 2, 5}

In [30]:

    

1 > 2


    

    
Out[30]:





False

In [32]:

    

1 < 2


    

    
Out[32]:





True

In [33]:

    

1 >= 2


    

    
Out[33]:





False

In [34]:

    

2 <= 2


    

    
Out[34]:





True

In [35]:

    

1 == 1


    

    
Out[35]:





True

In [36]:

    

1 == 2


    

    
Out[36]:





False

In [37]:

    

1 != 2


    

    
Out[37]:





True

In [38]:

    

'hello' != 'goodbye'


    

    
Out[38]:





True

In [44]:

    

(1 < 2) and (2 > 3) # one operator being false will make an entire statement false


    

    
Out[44]:





False

In [46]:

    

(1 < 2) or (2 > 3) or (1 == 1) # one operator being true will make an entire statement true


    

    
Out[46]:





True

In [48]:

    

True and True


    

    
Out[48]:





True

In [47]:

    

True and False


    

    
Out[47]:





False

In [49]:

    

True or False


    

    
Out[49]:





True

In [50]:

    

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


    

    




yep

In [51]:

    

if True:
    x = 2 + 2


    

In [52]:

    

x


    

    
Out[52]:





4

In [57]:

    

if (1==2):
    print('yep')
elif (2==2):
    print('dang')
elif (3==3):
    print('wooop')
else:
    print('nah, son')


    

    




dang

In [59]:

    

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


    

In [64]:

    

for item in seq:
    print('hello {}'.format(item))


    

    




hello 1
hello 2
hello 3
hello 4
hello 5

In [1]:

    

i = 0
while (i < 5):
    print('i is: {}'.format(i))
    i += 1


    

    




i is: 0
i is: 1
i is: 2
i is: 3
i is: 4

In [70]:

    

for x in range(0,5): # range is a generator. lists are different
    print(x)


    

    




0
1
2
3
4

In [72]:

    

list(range(10))


    

    
Out[72]:





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

In [73]:

    

x = [1,2,3,4]


    

In [75]:

    

out = []

for num in x:
    out.append(num**2)


    

In [76]:

    

print(out)


    

    




[1, 4, 9, 16]

In [79]:

    

out = [num**2 for num in x]


    

In [80]:

    

out


    

    
Out[80]:





[1, 4, 9, 16]

In [83]:

    

def the_func(param):
    print(param)
the_func('if I give you the func, you gon take it?')


    

    




if I give you the func, you gon take it?

In [87]:

    

def the_func(name='kendrick'): # setting a default
    print('hello world, {} here'.format(name)) # contents  of function


    

In [88]:

    

the_func() # runs the function and lets input default to something


    

    




hello world, kendrick here

In [91]:

    

the_func('pop') # overrides default


    

    




hello world, pop here

In [90]:

    

the_func # returns function object


    

    
Out[90]:





<function __main__.the_func>

In [102]:

    

def square(inp):
    """
    This is a docstring.
    Docstrings can be multiple lines, and can be called in jupyter with Shift-Tab.
    This function squares the input.
    """
    return inp**2


    

In [95]:

    

output = square(2)


    

In [97]:

    

output


    

    
Out[97]:





4

In [104]:

    

def times2(num):
    return num * 2


    

In [106]:

    

times2(3)


    

    
Out[106]:





6

In [108]:

    

# map()


    

In [110]:

    

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


    

In [113]:

    

list(map(times2,seq)) # << This is where lambda comes in. No need to define an entire function.


    

    
Out[113]:





[2, 4, 6, 8, 10]

In [123]:

    

def times2(num):return num * 2 # sike, it can actually be written as a one liner


    

In [115]:

    

times2(5)


    

    
Out[115]:





10

In [119]:

    

t = lambda var:var*2 # sike, it can actually be written as a shorter one liner


    

In [118]:

    

t(2)


    

    
Out[118]:





4

In [121]:

    

list(map(lambda var:var*2,seq)) # sike, it can actually all be combined tho


    

    
Out[121]:





[2, 4, 6, 8, 10]

In [125]:

    

list(filter(lambda var:var%2 == 0,seq)) # oh shiiiiiiiit


    

    
Out[125]:





[2, 4]

In [126]:

    

s = 'Sup my name is Ian'


    

In [129]:

    

s.lower()


    

    
Out[129]:





'sup my name is ian'

In [130]:

    

s.upper()


    

    
Out[130]:





'SUP MY NAME IS IAN'

In [131]:

    

s.title()


    

    
Out[131]:





'Sup My Name Is Ian'

In [132]:

    

s.split()


    

    
Out[132]:





['Sup', 'my', 'name', 'is', 'Ian']

In [134]:

    

tweet = 'Go Sports! #Sprots'


    

In [135]:

    

tweet.split()


    

    
Out[135]:





['Go', 'Sports!', '#Sprots']

In [136]:

    

d = {'k1':1,'k2':2}


    

In [137]:

    

d


    

    
Out[137]:





{'k1': 1, 'k2': 2}

In [138]:

    

d.keys()


    

    
Out[138]:





['k2', 'k1']

In [139]:

    

d.items()


    

    
Out[139]:





[('k2', 2), ('k1', 1)]

In [140]:

    

d.values()


    

    
Out[140]:





[2, 1]

In [154]:

    

lst = [1,2,3]


    

In [142]:

    

lst.pop()


    

    
Out[142]:





3

In [143]:

    

lst


    

    
Out[143]:





[1, 2]

In [146]:

    

lst = [1,2,3,4,5]
item = lst.pop()


    

In [147]:

    

item


    

    
Out[147]:





5

In [148]:

    

lst


    

    
Out[148]:





[1, 2, 3, 4]

In [149]:

    

first = lst.pop(0)


    

In [150]:

    

lst


    

    
Out[150]:





[2, 3, 4]

In [151]:

    

first


    

    
Out[151]:





1

In [152]:

    

lst.append('new')


    

In [153]:

    

lst


    

    
Out[153]:





[2, 3, 4, 'new']

In [155]:

    

'x' in [1,2,3]


    

    
Out[155]:





False

In [157]:

    

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


    

    
Out[157]:





True

In [158]:

    

x = [(1,2),(3,4),(5,6)]


    

In [161]:

    

x[0][1]


    

    
Out[161]:





2

In [166]:

    

for a,b in x:
    print(a)
    print(b)


    

    




1
2
3
4
5
6

In [ ]: