How to use join() work? (Python)

Question

How can I use the join() function?
I am trying to concatenate converted int
# str(some_int) into a list.
That come from a for loop.

I am finding it difficult to explain, but if someone could give me a clear example of how join() can be put to use, I would be very grateful.

Answer 1

First you have to define a join string.

Let it be '-'.

Then you write:

'-'.join(...

which means:

'Take - and use it to join up...'

and then comes any iterable, be it a list, a tuple ... as long as it contains strings. Or just a string, which is also made of strings.

'-'.join(['a', 'b', 'c'])

And that's all there is to it.

Result:

'a-b-c'

Answer 2

I have been working on understanding it more and have written this answer to my own posted question :)

just copy paste this code and run it

#the join() function is used on strings
#is it to join a list (of strings) together, either with or without another string as a separator

thisStrLst = ["one", "two", "three"]
print(", ".join(thisStrLst))

#the fact that the list has the same spacing as the output is because of the part before the .join() (the ", ") and not because of the list.
#you can see an example below of a different separator; " + "

thisStrLst = ["one", "two", "three"]
print(" + ".join(thisStrLst))

#you can also use a variable here for the first part of the join()
#of course you need to define the variable first and this needs to be a string!

thisStrLst = ["one", "two", "three"]
cmaSpcStr = ", "
print(cmaSpcStr.join(thisStrLst))

#if you print lists it will look like

fibStrLst = ["1","1","2","3","5","8"]
print("a printed list looks like: " + str(fibStrLst))

#so what if you want to use that list as one line of all numbers together? Use join as below
#the separator is simply a string with no space or letter/number in it; ""

print("".join(fibStrLst))

#you can even use join() on a string (a string is a series of strings). this, counterintuitively doesn't join letters/words/etc, but takes a string apart and puts them in a order with a separator between the letters.

print(", ".join("spam"))

Answer 3

thanks!