In Python, you can join a list (or a tuple) of string objects into a single string object, using the
join method in the string class. As the join method's in the string class, it has to be called on a string object, and that's the
separator that you're putting between each of the joined elements. Thus:
days = ["Monday","Tuesday","Wednesday"]
all = "<br>".join(days)
If I want to split a line of text
at a literal string, I specify the complete string as the object on which the
split method runs, and then specify the desired separator as a parameter; here are a couple of examples:
say = "This is a line of text"
parts = say.split(" ")
first, second = "Tom Smiota".split(" ")
second, first = first, second
That last line is interesting - it's a demonstration of swapping over two variables without the need to specify an intermediate variable - in a standard (previous generation language you might have written:
temp = second
second = first
first = temp
But in Python, a temporary tuple is created to hold both values as you do the transfer, so the coding is shorter and more straightforward.
Python also supports a split method in the re - regular expression - class. It is not polymorphic with the literal string method (i.e. it has a different calling logic / sequence); you specify a regular expression object on which the method is to run, and then you pass in the string to be split as the parameter.
Complete source including the example snippets above -
[here] - taken from our
Python Programming Training Course.
(written 2010-06-16)
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