Shorcuts:



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









    



Hello
(SHIFT + ENTER) will run a cell.



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mList = [1,2,3]



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









    



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



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









    



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



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# help(mList)



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# This is a comment



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NUMBERS :



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2+1









    Out[0]:





3



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2+2









    Out[0]:





4



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3-1









    Out[0]:





2



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2*5









    Out[0]:





10



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1/5









    Out[0]:





0.2



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3/2     # classic integer division









    Out[0]:





1.5



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3.0/2   # true division









    Out[0]:





1.5



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3/2.0









    Out[0]:





1.5



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float(3)        #casting:









    Out[0]:





3.0



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#importing capabilities from python3 into python2

from __future__ import division



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3/2         #(due to __future__)









    Out[0]:





1.5



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# power

12**2









    Out[0]:





144



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# square root

144**0.5









    Out[0]:





12.0



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a = 5



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a









    Out[0]:





5



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a+a









    Out[0]:





10



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a = 10



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a









    Out[0]:





10



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a = a+a



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a









    Out[0]:





20



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my_income = 1000000



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tax_rate = 0.2



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my_taxes = my_income * tax_rate



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my_taxes









    Out[0]:





200000.0



In [0]:

STRINGS



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'Hello'









    Out[0]:





'Hello'



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'This is also a string'









    Out[0]:





'This is also a string'



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'I'm a string    # ERROR









    



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



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"I'm a string"    #OK









    Out[0]:





"I'm a string"



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'Hello World 1'
'Hello World 2'









    Out[0]:





'Hello World 2'



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# print statement 

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









    



Hello World 1
Hwllo World 2



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









    



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



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print 'before TAB \t after TAB'









    



before TAB 	 after TAB



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print("hello World")









    



hello World



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



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print ('how are you')









    



how are you



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len('Hello World')









    Out[0]:





11



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s = 'Hello World'



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s









    Out[0]:





'Hello World'



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# indexing
s[0]









    Out[0]:





'H'



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s[5]









    Out[0]:





' '



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# slicing
s[1:]









    Out[0]:





'ello World'



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s[1:7]









    Out[0]:





'ello W'



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s[:8]









    Out[0]:





'Hello Wo'



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s[:]









    Out[0]:





'Hello World'



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s[1:1]









    Out[0]:





''



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s[-1]









    Out[0]:





'd'



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s[-2]









    Out[0]:





'l'



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s[:-1]









    Out[0]:





'Hello Worl'



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s[:-2]









    Out[0]:





'Hello Wor'



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s[::1]









    Out[0]:





'Hello World'



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s[1:5:1]









    Out[0]:





'ello'



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s[1:5:2]









    Out[0]:





'el'



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s[::2]









    Out[0]:





'HloWrd'



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









    Out[0]:





'dlroW olleH'



In [0]:

    
# 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



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# concatenation

s + "Concatenate me!"









    Out[0]:





'Hello WorldConcatenate me!'



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# multiplication
letter = 'p'



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letter









    Out[0]:





'p'



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letter * 10









    Out[0]:





'pppppppppp'



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print letter * 18









    



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



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print(letter * 5)









    



ppppp



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s = 'rustom'



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# uppercase

s.upper()









    Out[0]:





'RUSTOM'



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# lowercase

s.lower()









    Out[0]:





'rustom'



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# splitting a string

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









    Out[0]:





['rust', 'm']



In [0]:

PRINT Formatting:



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print 'This is a string'









    



This is a string



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print('This is a string')









    



This is a string



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m_str = 'String'

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









    



Place my variable here: String



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









    



Place my variables here: 13.35



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









    



Floating point number: 82.17



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









    



Floating point number: 82.175000000000



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









    



Floating point number:              82.17



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#conversion methods:

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









    



Conversion to string 15.96



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









    



first: hi, 
second: rus, 
third: potter



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









    



First: Hello Potter 
Second: Hello Potter



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









    



First: Hariom, 
Second: Guruji, 
Third: OmGuru



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from __future__ import print_function



In [0]:

    
print('hello')









    



hello



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









    



First: INSERT!!!



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