First Python Live session for Python for Beginners

In [44]:

    

new_string = 'This is the first python live session'


    

In [48]:

    

new_string
new_string_ = 't' + new_string[1:]
new_string_


    

    
Out[48]:





'this is the first python live session'

In [40]:

    

# Unicode strings
u_string = u'A unicode \u018e string \xf1'
u_string


    

    
Out[40]:





'A unicode Ǝ string ñ'

In [50]:

    

# ascii string
a_string = 'this\tis a ascii\nstring'
print(a_string)


    

    




this	is a ascii
string

In [43]:

    

# r-string or raw string
r_string = r'this is an r \nstring \t'
r_string


    

    
Out[43]:





'this is an r \\nstring \\t'

In [6]:

    

string1 = 'hello'
string2 = 'there'
string3 = 'Mary had a little lamb'


    

In [52]:

    

# to get last element
print(string1)
string1[4]


    

    




hello






    
Out[52]:





'o'

In [55]:

    

# to get the THIRD element
print(string2)
string2[2]


    

    




there






    
Out[55]:





'e'

In [56]:

    

# TO get a range of elements
print(string3)
string3[0:4]


    

    




Mary had a little lamb






    
Out[56]:





'Mary'

In [12]:

    

help(str.split)


    

    




Help on method_descriptor:

split(...)
    S.split(sep=None, maxsplit=-1) -> list of strings
    
    Return a list of the words in S, using sep as the
    delimiter string.  If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator and empty strings are
    removed from the result.

In [57]:

    

print(string3)
string3.split()


    

    




Mary had a little lamb






    
Out[57]:





['Mary', 'had', 'a', 'little', 'lamb']

In [58]:

    

le_falta_la_a = string3.split('a')
le_falta_la_a


    

    
Out[58]:





['M', 'ry h', 'd ', ' little l', 'mb']

In [13]:

    

help(str.join)


    

    




Help on method_descriptor:

join(...)
    S.join(iterable) -> str
    
    Return a string which is the concatenation of the strings in the
    iterable.  The separator between elements is S.

In [22]:

    

tiene_la_a = 'a'.join(le_falta_la_a)
tiene_la_a


    

    
Out[22]:





'Mary had a little lamb'

In [1]:

    

string1 = ['this', 'iss', 'a', 'random', 'string']
'*'.join(string1)


    

    
Out[1]:





'this*iss*a*random*string'

In [23]:

    

help(str.rstrip)


    

    




Help on method_descriptor:

rstrip(...)
    S.rstrip([chars]) -> str
    
    Return a copy of the string S with trailing whitespace removed.
    If chars is given and not None, remove characters in chars instead.

In [26]:

    

this_is_a_string = 'adfadfds                                    '


    

In [27]:

    

this_is_a_string.rstrip()


    

    
Out[27]:





'adfadfds'

In [29]:

    

left_spaces = '             adgfgfsgsfdgsr'
left_spaces


    

    
Out[29]:





'             adgfgfsgsfdgsr'

In [30]:

    

left_spaces.lstrip()


    

    
Out[30]:





'adgfgfsgsfdgsr'

In [31]:

    

help(str.rfind)


    

    




Help on method_descriptor:

rfind(...)
    S.rfind(sub[, start[, end]]) -> int
    
    Return the highest index in S where substring sub is found,
    such that sub is contained within S[start:end].  Optional
    arguments start and end are interpreted as in slice notation.
    
    Return -1 on failure.

In [59]:

    

print(string3)
string3.rfind('had ')


    

    




Mary had a little lamb






    
Out[59]:





5

In [66]:

    

'{one}{one}{one}'.format(one=5,three=3, two=4)


    

    
Out[66]:





'555'

In [62]:

    

stringgggg = '%d%d%d' % (5,4,3)
print(stringgggg)


    

    




543