Help on method_descriptor:

join(...)

    S.join(iterable) -> string

    Return a string which is the concatenation of the strings in the

    iterable.  The separator between elements is S.

(END)

In [2]: s = ['hello', 'world']

In [3]: '_'.join(s)

Out[3]: 'hello_world'

In [4]: ''.join(s)

Out[4]: 'helloworld'

In [5]: '&&'.join(s)

Out[5]: 'hello&&world'

In [6]: '_'.join((1, 2, 3))

---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

<ipython-input-6-48e56abfc814> in <module>()

----> 1 '_'.join((1, 2, 3))

TypeError: sequence item 0: expected string, int found

Help on method_descriptor:

split(...)

    S.split([sep [,maxsplit]]) -> list of strings

    Return a list of the words in the string 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.

(END)

In [9]: s = 'life is short, I use Python'                                                                                                                               

In [10]: s.spl

s.split       s.splitlines  

In [10]: s.split()

Out[10]: ['life', 'is', 'short,', 'I', 'use', 'Python']

In [11]: s.split(',')

Out[11]: ['life is short', ' I use Python']

In [12]: s.split(',' or '.')

Out[12]: ['life is short', ' I use Python']

In [13]: s.split(',', 3)

Out[13]: ['life is short', ' I use Python']

In [14]: s.split(',', 5)

Out[14]: ['life is short', ' I use Python']

In [15]: s = 'hello, world. Life is short, I use Python'                                                                                                                

In [16]: s.split(',', 5)

Out[16]: ['hello', ' world. Life is short', ' I use Python']

In [17]: s.split(',', 2)

Out[17]: ['hello', ' world. Life is short', ' I use Python']

In [18]: s.split(',', 1)

Out[18]: ['hello', ' world. Life is short, I use Python']

In [19]: s.split(',' or '.', 2)

Out[19]: ['hello', ' world. Life is short', ' I use Python']