35     Python by default provides support to complex numbers. 

    36     c = 3+4j 

    37     c is a complex number. 'j' is used to specify the imaginary part.

    38     type(c)

    39     Python also provides basic functions for their manipulations like

    40     abs(c) will return the absolute value of c(sqrt(a^2 + b^2))

    41     c.imag returns imaginary part of the variable

    42     and similarly c.real gives real part.

    43 

    44     Next we will look at Boolean data types:

    45     Its a primitive datatype having one of two values: True or False.

    46     t = True

    47     print t

    48 

    49     Python is case sensitive language, so True with 'T' is boolean type but

    50     true with 't' would be a variable. 

    51     

    52     f = not True

    53     

    54     we can do binary operation like 'or' and 'not' with these variables

    55     f or t

    56     f and t

    57     

    58     in case of multiple binary operations to make sure of precedence use 

    59     'brackets ()'

    60     a = False

    61     b = True

    62     c = True

    63     (a and b) or c    

    64     True

    65     first a and b is evaluated and then the 'or' statement

    66     a and (b or c)

    67     False

    68 

    69     Now we shall look at Python Strings.

    70     In python anything enclosed inside quotes(single or double) is a string

    71     so 

    72     a = 'This is a string'

    73     print a

    74     b = "This too!"

    75     print b

    76     c = '''This one too!'''

    77     print c

    78     d = """And one more."""

    79     print d

    80     

    81     Similar to lists we covered earlier even string elements can be accessed 

    82     via index numbers starting from 0

    83 

    84     print a[0]    

    85     print a[5]

    86     will 

    87     To access last element we can use a[-1] which is one of Pythons feature.

    88     print a[-1]

    89     len function works with the strings also as it does with the arrays and 

    90     returns length of the string.

    91     

    92     One thing to notice about the string variables is that they are 

    93     immutable, that is

    94     a[0] = 't'

    95     will throw an error

    96     

    97     Some of methods available for string are:

    98     a.startswith('Thi')

    99     returns true if initial of the string is same

   100     similarly there is endswith

   101     a.endswith('ING')

   102     a.upper() returns a string will all letters capitalized.

   103     and a.lower() returns a string with all smaller case letters.

   104     As we have seen earlier use of split function, it returns the list after

   105     splitting the string, so

   106     a.split()

   107     will give list with three elements.

   108     Opposite to this function, we also have 'join' function.

   109     ''.join(['a','b','c']) will return a joined string of the list we pass

   110     to it. Since join is performed on '' that is empty string we get 'abc'

   111     if we do something like

   112     '-'.join(['a','b','c'])

   113