Python join and split functions, pythonjoinsplit

Python join and split functions, pythonjoinsplit

One is segmentation and the other is connection.

Practice: First read the internal help documentation

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)

Concatenate the iteratable objects (including the str type, otherwise an error will be reported). The returned value is str. The usage is as follows:

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

 

Let's look at the split function again:

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)

Splits string, spaces, or empty characters, and returns the str list. The second parameter is the number of splits. The usage is as follows:

In [9]: s = 'life is short, I use Python'                                                                                                                               In [10]: s.spls.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']