In [1]:

    

my_dict = {'key' : 1, 'key2' : 2}


    

In [2]:

    

my_dict


    

    
Out[2]:





{'key': 1, 'key2': 2}

In [3]:

    

my_dict['key']


    

    
Out[3]:





1

In [5]:

    

my_dict.fromkeys()


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-f410f13265eb> in <module>()
----> 1 my_dict.fromkeys()

TypeError: fromkeys expected at least 1 arguments, got 0

In [6]:

    

my_dict.viewkeys()


    

    
Out[6]:





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

In [9]:

    

my_dict.viewitems()


    

    
Out[9]:





dict_items([('key2', 2), ('key', 1)])

In [10]:

    

tup = (1, 3, 6)


    

In [12]:

    

tup.count(1)


    

    
Out[12]:





1

In [13]:

    

tup.count("test")


    

    
Out[13]:





0

In [14]:

    

tup.index(1)


    

    
Out[14]:





0

In [16]:

    

tup.index(3)


    

    
Out[16]:





1

In [17]:

    

len(tup)


    

    
Out[17]:





3

In [20]:

    

for (item in tup) {
    print(item)
}


    

    




  File "<ipython-input-20-dc6466b0c9d2>", line 1
    for (item in tup) {
                      ^
SyntaxError: invalid syntax

In [21]:

    

tup


    

    
Out[21]:





(1, 3, 6)

In [22]:

    

tup[0]


    

    
Out[22]:





1

In [23]:

    

x = set()


    

In [24]:

    

x


    

    
Out[24]:





set()

In [ ]:

    




    

In [25]:

    

x.add(1, 2)


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-25-e4b9e3584b3b> in <module>()
----> 1 x.add(1, 2)

TypeError: add() takes exactly one argument (2 given)

In [26]:

    

x.add(1)


    

In [27]:

    

x


    

    
Out[27]:





{1}

In [28]:

    

x[0]


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-28-1ae75c28907a> in <module>()
----> 1 x[0]

TypeError: 'set' object does not support indexing

In [29]:

    

x.update(1)


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-29-d52ae0c230d7> in <module>()
----> 1 x.update(1)

TypeError: 'int' object is not iterable

In [30]:

    

x[1]


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-30-98e225784849> in <module>()
----> 1 x[1]

TypeError: 'set' object does not support indexing

In [31]:

    

li = [1, 1, 1, 2, 3, 3, 3, 4]


    

In [32]:

    

li_set = set(li)


    

In [33]:

    

li_set


    

    
Out[33]:





{1, 2, 3, 4}

In [34]:

    

my_string = "hello this is a string"


    

In [35]:

    

first = my_string[0]


    

In [36]:

    

first


    

    
Out[36]:





'h'

In [37]:

    

last = my_string[1:-1]


    

In [38]:

    

last


    

    
Out[38]:





'ello this is a strin'

In [39]:

    

last = my_string[-2:-1]


    

In [40]:

    

last


    

    
Out[40]:





'n'

In [41]:

    

last = my_string[-1:]


    

In [42]:

    

last


    

    
Out[42]:





'g'

In [43]:

    

first


    

    
Out[43]:





'h'

In [44]:

    

middle = my_string[1:-1]


    

In [45]:

    

middle


    

    
Out[45]:





'ello this is a strin'

In [46]:

    

short_string = "ab"


    

In [47]:

    

short_string[0]


    

    
Out[47]:





'a'

In [48]:

    

short_string[-1:]


    

    
Out[48]:





'b'

In [49]:

    

short_string[1:-1]


    

    
Out[49]:





''

In [50]:

    

single_letter = "a"


    

In [52]:

    

single_letter[-1:]


    

    
Out[52]:





'a'

In [53]:

    

single_letter[1:-1]


    

    
Out[53]:





''

In [54]:

    

my_string


    

    
Out[54]:





'hello this is a string'

In [55]:

    

my_string = "hello"


    

In [70]:

    

def string_splosion(str): 
    return_string = ""
    for i in range(len(str)):
        print(str[:i])
        return_string += str[:i]
        
    print(return_string + str)


    

In [71]:

    

string_splosion("Code")


    

    




C
Co
Cod
CCoCodCode

In [110]:

    

# http://codingbat.com/prob/p145834
def last2(str):
    pattern = str[-2:]
    test_string = str[:-1]
    print("Pattern: %s" % pattern)
    counter = 0
    for i in range(len(test_string)):
        substr = test_string[i:i+2]
        print("Loop: {x}, substring: {y}".format(x=i, y=substr))
        if substr == pattern:
            counter+=1
            print("matched")
    return counter


    

In [84]:

    

last2("Hello")


    

    




He
el

In [112]:

    

'code'[0]


    

    
Out[112]:





'c'

In [77]:

    

"code"[3:100]


    

    
Out[77]:





'e'

In [111]:

    

last2("xxxx")


    

    




Pattern: xx
Loop: 0, substring: xx
matched
Loop: 1, substring: xx
matched
Loop: 2, substring: x






    
Out[111]:





2

In [5]:

    

# dictionary comprehensions (not incredibly common)

sq = {'val {0}'.format(x):x**2 for x in range(10)}
print sq


    

    




{'val 8': 64, 'val 9': 81, 'val 0': 0, 'val 1': 1, 'val 2': 4, 'val 3': 9, 'val 4': 16, 'val 5': 25, 'val 6': 36, 'val 7': 49}

In [11]:

    

{k:v**2 for k,v in zip(['a', 'b'], range(2)) }


    

    
Out[11]:





{'a': 0, 'b': 1}

In [14]:

    

dict(zip(['a', 'b'], [0, 1]))


    

    
Out[14]:





{'a': 0, 'b': 1}

In [ ]: