Shorcuts:



In [37]:

    
print "(SHIFT + ENTER) will run a cell."









    



(SHIFT + ENTER) will run a cell.



In [38]:

    
mList = [1,2,3]



In [39]:

    
print "TAB will show a popup of the methods on an object!!"









    



TAB will show a popup of the methods on an object!!



In [40]:

    
print "(SHIFT + TAB) will show help popup for docstring."









    



(SHIFT + TAB) will show help popup for docstring.



In [41]:

    
# help(mList)



In [42]:

    
# This is a comment



In [ ]:

NUMBERS :



In [43]:

    
2+1









    Out[43]:





3



In [44]:

    
2+2









    Out[44]:





4



In [45]:

    
3-1









    Out[45]:





2



In [46]:

    
2*5









    Out[46]:





10



In [47]:

    
1/5









    Out[47]:





0.2



In [48]:

    
3/2     # classic integer division









    Out[48]:





1.5



In [49]:

    
3.0/2   # true division









    Out[49]:





1.5



In [50]:

    
3/2.0









    Out[50]:





1.5



In [51]:

    
float(3)        #casting:









    Out[51]:





3.0



In [52]:

    
#importing capabilities from python3 into python2

from __future__ import division



In [53]:

    
3/2         #(due to __future__)









    Out[53]:





1.5



In [54]:

    
# power

12**2









    Out[54]:





144



In [55]:

    
# square root

144**0.5









    Out[55]:





12.0



In [56]:

    
a = 5



In [57]:

    
a









    Out[57]:





5



In [58]:

    
a+a









    Out[58]:





10



In [59]:

    
a = 10



In [60]:

    
a









    Out[60]:





10



In [61]:

    
a = a+a



In [62]:

    
a









    Out[62]:





20



In [63]:

    
my_income = 1000000



In [64]:

    
tax_rate = 0.2



In [65]:

    
my_taxes = my_income * tax_rate



In [66]:

    
my_taxes









    Out[66]:





200000.0



In [ ]:

STRINGS



In [67]:

    
'Hello'









    Out[67]:





'Hello'



In [68]:

    
'This is also a string'









    Out[68]:





'This is also a string'



In [69]:

    
'I'm a string    # ERROR









    



  File "<ipython-input-69-2d82d9e81731>", line 1
    'I'm a string    # ERROR
       ^
SyntaxError: invalid syntax



In [70]:

    
"I'm a string"    #OK









    Out[70]:





"I'm a string"



In [71]:

    
'Hello World 1'
'Hello World 2'









    Out[71]:





'Hello World 2'



In [72]:

    
# print statement 

print 'Hello World 1'
print 'Hwllo World 2'









    



Hello World 1
Hwllo World 2



In [73]:

    
print 'Here is a new line \n and here is a 2nd line'









    



Here is a new line 
 and here is a 2nd line



In [74]:

    
print 'before TAB \t after TAB'









    



before TAB 	 after TAB



In [75]:

    
print("hello World")









    



hello World



In [76]:

    
# To use print function from Python3 in Python2
from __future__ import print_function



In [77]:

    
print ('how are you')









    



how are you



In [78]:

    
len('Hello World')









    Out[78]:





11



In [79]:

    
s = 'Hello World'



In [80]:

    
s









    Out[80]:





'Hello World'



In [81]:

    
# indexing
s[0]









    Out[81]:





'H'



In [82]:

    
s[5]









    Out[82]:





' '



In [83]:

    
# slicing
s[1:]









    Out[83]:





'ello World'



In [84]:

    
s[1:7]









    Out[84]:





'ello W'



In [85]:

    
s[:8]









    Out[85]:





'Hello Wo'



In [86]:

    
s[:]









    Out[86]:





'Hello World'



In [87]:

    
s[1:1]









    Out[87]:





''



In [88]:

    
s[-1]









    Out[88]:





'd'



In [89]:

    
s[-2]









    Out[89]:





'l'



In [90]:

    
s[:-1]









    Out[90]:





'Hello Worl'



In [91]:

    
s[:-2]









    Out[91]:





'Hello Wor'



In [92]:

    
s[::1]









    Out[92]:





'Hello World'



In [93]:

    
s[1:5:1]









    Out[93]:





'ello'



In [94]:

    
s[1:5:2]









    Out[94]:





'el'



In [95]:

    
s[::2]









    Out[95]:





'HloWrd'



In [96]:

    
s[::-1]          # reversing the string backwards









    Out[96]:





'dlroW olleH'



In [97]:

    
# immutability

s[2] = 'P'        # cannot assign to a particlar element in a string sequence









    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-97-eae392253637> in <module>()
      1 # immutability
      2 
----> 3 s[2] = 'P'        # cannot assign to a particlar element in a string sequence

TypeError: 'str' object does not support item assignment



In [98]:

    
# concatenation

s + "Concatenate me!"









    Out[98]:





'Hello WorldConcatenate me!'



In [99]:

    
# multiplication
letter = 'p'



In [100]:

    
letter









    Out[100]:





'p'



In [101]:

    
letter * 10









    Out[101]:





'pppppppppp'



In [116]:

    
print letter * 18









    



  File "<ipython-input-116-5d56031a985b>", line 1
    print letter * 18
               ^
SyntaxError: invalid syntax



In [112]:

    
print(letter * 5)









    



ppppp



In [113]:

    
s = 'rustom'



In [114]:

    
# uppercase

s.upper()









    Out[114]:





'RUSTOM'



In [115]:

    
# lowercase

s.lower()









    Out[115]:





'rustom'



In [117]:

    
# splitting a string

s.split('o')         # splitting around 'o'









    Out[117]:





['rust', 'm']



In [ ]:

PRINT Formatting:



In [1]:

    
print 'This is a string'









    



This is a string



In [2]:

    
print('This is a string')









    



This is a string



In [3]:

    
m_str = 'String'

print 'Place my variable here: %s' %(m_str)









    



Place my variable here: String



In [4]:

    
x = 13.35
print 'Place my variables here: %s' %(x)









    



Place my variables here: 13.35



In [5]:

    
print 'Floating point number: %1.2f' %(82.175)









    



Floating point number: 82.17



In [6]:

    
print 'Floating point number: %1.12f' %(82.175)









    



Floating point number: 82.175000000000



In [7]:

    
print 'Floating point number: %18.2f' %(82.175)









    



Floating point number:              82.17



In [8]:

    
#conversion methods:

print 'Conversion to string %r' %(15.96)









    



Conversion to string 15.96



In [9]:

    
print 'first: %s, \nsecond: %s, \nthird: %s' %('hi', 'rus', 'potter')









    



first: hi, 
second: rus, 
third: potter



In [10]:

    
print 'First: {x} \nSecond: {x}'.format(x = "Hello Potter")









    



First: Hello Potter 
Second: Hello Potter



In [11]:

    
print 'First: {x}, \nSecond: {y}, \nThird: {z}'.format(x = "Hariom", y = "Guruji", z = 'OmGuru')









    



First: Hariom, 
Second: Guruji, 
Third: OmGuru



In [12]:

    
from __future__ import print_function



In [13]:

    
print('hello')









    



hello



In [14]:

    
print('First: {x}'.format(x = 'INSERT!!!'))









    



First: INSERT!!!



In [ ]: