notebook.community

Edit and run



In [1]:

    
message = str('Hello Python')



In [2]:

    
message









    Out[2]:





'Hello Python'



In [3]:

    
type(message)









    Out[3]:





str



In [4]:

    
type(str)









    Out[4]:





type



In [5]:

    
isinstance(str, type)









    Out[5]:





True



In [6]:

    
isinstance(message, str)









    Out[6]:





True



In [7]:

    
message.upper()









    Out[7]:





'HELLO PYTHON'



In [9]:

    
message.title()









    Out[9]:





'Hello Python'



In [10]:

    
message.__len__()









    Out[10]:





12



In [11]:

    
len(message)









    Out[11]:





12



In [12]:

    
id(message)









    Out[12]:





87164032L



In [19]:

    
hex(id(message))









    Out[19]:





'0x5320480L'



In [20]:

    
message.__getitem__(0)









    Out[20]:





'H'



In [21]:

    
message[0]









    Out[21]:





'H'



In [22]:

    
dir(str)









    Out[22]:





['__add__',
 '__class__',
 '__contains__',
 '__delattr__',
 '__doc__',
 '__eq__',
 '__format__',
 '__ge__',
 '__getattribute__',
 '__getitem__',
 '__getnewargs__',
 '__getslice__',
 '__gt__',
 '__hash__',
 '__init__',
 '__le__',
 '__len__',
 '__lt__',
 '__mod__',
 '__mul__',
 '__ne__',
 '__new__',
 '__reduce__',
 '__reduce_ex__',
 '__repr__',
 '__rmod__',
 '__rmul__',
 '__setattr__',
 '__sizeof__',
 '__str__',
 '__subclasshook__',
 '_formatter_field_name_split',
 '_formatter_parser',
 'capitalize',
 'center',
 'count',
 'decode',
 'encode',
 'endswith',
 'expandtabs',
 'find',
 'format',
 'index',
 'isalnum',
 'isalpha',
 'isdigit',
 'islower',
 'isspace',
 'istitle',
 'isupper',
 'join',
 'ljust',
 'lower',
 'lstrip',
 'partition',
 'replace',
 'rfind',
 'rindex',
 'rjust',
 'rpartition',
 'rsplit',
 'rstrip',
 'split',
 'splitlines',
 'startswith',
 'strip',
 'swapcase',
 'title',
 'translate',
 'upper',
 'zfill']

Other useful and interesting builtins in Python



In [23]:

    
chr(65)









    Out[23]:





'A'



In [24]:

    
ord('a')









    Out[24]:





97

Let us combine two or more builtins to perform some simple magic.

map applies the function passed as the first argument for each of the elements in the second argument and returns a list object containing the results of the function application.
range is used to generate a sequence of integers over the interval [start, end)



In [25]:

    
map(ord, 'abcde')









    Out[25]:





[97, 98, 99, 100, 101]



In [26]:

    
map(chr, range(65, 65+26))









    Out[26]:





['A',
 'B',
 'C',
 'D',
 'E',
 'F',
 'G',
 'H',
 'I',
 'J',
 'K',
 'L',
 'M',
 'N',
 'O',
 'P',
 'Q',
 'R',
 'S',
 'T',
 'U',
 'V',
 'W',
 'X',
 'Y',
 'Z']

Let us look at some integer magic using various bases (decimal, binary, octal, hexadecimal)



In [27]:

    
bin(255)









    Out[27]:





'0b11111111'



In [28]:

    
hex(255)









    Out[28]:





'0xff'



In [29]:

    
int('0b00111111', base=2)









    Out[29]:





63



In [ ]: