In [1]:

    

print 'hello world'


    

    




hello world

In [2]:

    

5 * 5


    

    
Out[2]:





25

In [3]:

    

x = 'hello'


    

In [4]:

    

x


    

    
Out[4]:





'hello'

In [5]:

    

y = 'world'


    

In [6]:

    

x + y


    

    
Out[6]:





'helloworld'

In [7]:

    

y + x


    

    
Out[7]:





'worldhello'

In [8]:

    

y * 100


    

    
Out[8]:





'worldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworldworld'

In [9]:

    

import random


    

In [10]:

    

randnum = random.randint(5,20)


    

In [11]:

    

print randnum


    

    




9

In [12]:

    

y * randnum


    

    
Out[12]:





'worldworldworldworldworldworldworldworldworld'

In [13]:

    

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


    

In [14]:

    

l


    

    
Out[14]:





[1, 2, 3, 4, 5]

In [15]:

    

l[0]


    

    
Out[15]:





1

In [16]:

    

l[4]


    

    
Out[16]:





5

In [17]:

    

len(l)


    

    
Out[17]:





5

In [22]:

    

l[random.randint(0, 4)]


    

    
Out[22]:





4

In [23]:

    

l[5]


    

    




---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-23-437134752604> in <module>()
----> 1 l[5]

IndexError: list index out of range

In [24]:

    

a = 1


    

In [25]:

    

a


    

    
Out[25]:





1

In [26]:

    

b = a + 1


    

In [27]:

    

b


    

    
Out[27]:





2

In [31]:

    

a = a + 1


    

In [32]:

    

a


    

    
Out[32]:





3

In [30]:

    

b


    

    
Out[30]:





2

In [33]:

    

a = a * 2


    

In [34]:

    

a


    

    
Out[34]:





6

In [35]:

    

a = a / 5


    

In [36]:

    

a


    

    
Out[36]:





1

In [37]:

    

a = 6


    

In [38]:

    

a = a / 5.0


    

In [39]:

    

a


    

    
Out[39]:





1.2

In [40]:

    

a = 6


    

In [41]:

    

a // 5


    

    
Out[41]:





1

In [42]:

    

from __future__ import division


    

In [43]:

    

a / 5


    

    
Out[43]:





1.2

In [44]:

    

a // 5


    

    
Out[44]:





1

In [45]:

    

l


    

    
Out[45]:





[1, 2, 3, 4, 5]

In [46]:

    

rev


    

    




---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-46-0f5afa285cb7> in <module>()
----> 1 rev

NameError: name 'rev' is not defined

In [47]:

    

reversed


    

    
Out[47]:





reversed

In [49]:

    

list(reversed(l))


    

    
Out[49]:





[5, 4, 3, 2, 1]

In [51]:

    

d = {"colour" : "green", "height" : "tall", "weight" : "heavy"}


    

In [53]:

    

d["color"]


    

    




---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-53-41e6f0cce3d4> in <module>()
----> 1 d["color"]

KeyError: 'color'

In [54]:

    

d["speed"] = "fast"


    

In [55]:

    

d


    

    
Out[55]:





{'colour': 'green', 'height': 'tall', 'speed': 'fast', 'weight': 'heavy'}

In [56]:

    

len(d)


    

    
Out[56]:





4

In [57]:

    

d.keys()


    

    
Out[57]:





['colour', 'speed', 'weight', 'height']

In [58]:

    

d.values()


    

    
Out[58]:





['green', 'fast', 'heavy', 'tall']

In [59]:

    

sorted(d.keys())


    

    
Out[59]:





['colour', 'height', 'speed', 'weight']

In [60]:

    

def f(x) :
    return x * 2


    

In [61]:

    

f(3)


    

    
Out[61]:





6

In [62]:

    

f(1.5)


    

    
Out[62]:





3.0

In [63]:

    

f("hi there")


    

    
Out[63]:





'hi therehi there'

In [64]:

    

"hi" * 2


    

    
Out[64]:





'hihi'

In [65]:

    

"hi" * "hi"


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-65-a4764eace0be> in <module>()
----> 1 "hi" * "hi"

TypeError: can't multiply sequence by non-int of type 'str'

In [66]:

    

l = ["one", "two", "three"]


    

In [67]:

    

l[0]


    

    
Out[67]:





'one'

In [68]:

    

l[0] + l[1] + l[2]


    

    
Out[68]:





'onetwothree'

In [73]:

    

",".join(l)


    

    
Out[73]:





'one,two,three,four'

In [71]:

    

l.append("four")


    

In [72]:

    

l


    

    
Out[72]:





['one', 'two', 'three', 'four']

In [74]:

    

sorted(l)


    

    
Out[74]:





['four', 'one', 'three', 'two']

In [75]:

    

l


    

    
Out[75]:





['one', 'two', 'three', 'four']

In [76]:

    

l2 = sorted(l)


    

In [77]:

    

l2


    

    
Out[77]:





['four', 'one', 'three', 'two']

In [78]:

    

l


    

    
Out[78]:





['one', 'two', 'three', 'four']

In [79]:

    

l.sort()


    

In [80]:

    

l


    

    
Out[80]:





['four', 'one', 'three', 'two']

In [ ]: