How to append two string array in python

Question

I've two list of string, I'm trying to append both list and would like to add pipe (|) delimiter at the end of string. Please find my code below:

firstList = ['Product1,item,,description,price|', 'Product2,item,,description,price|','Product3,item,,description,price|']
secondList = 'Product4,item,,description,price'

result = firstlist + secondList
result.append('|')
print result

I want to print my output like below:

Product1,item,,description,price|Product2,item,,description,price|Product3,item,,description,price|Product4,item,,description,price|

But my code is not appending the pipe delimiter property, its appending as a separate string value in the list. While appending new value in existing list I'm seeing blank space which I don't want.

Can someone please help to resolve this. It would be really helpful if someone can educate what's the efficient way of appending two list in python.

Thanks.

Are you guaranteed that the strings in the first list are already terminated by a pipe? (Note that a final character is a terminator not a delimiter.) — Code-Apprentice
– Code-Apprentice, Commented Nov 5, 2017 at 0:22
I don't understand your previous comment. And it doesn't answer my question. — Code-Apprentice
– Code-Apprentice, Commented Nov 5, 2017 at 0:25
No, I mean the strings in firstList already end with pipes. Will this always be the case for every possible input to your program? — Code-Apprentice
– Code-Apprentice, Commented Nov 5, 2017 at 0:29

Ajax1234 · Accepted Answer · 2017-11-05 01:40:17Z

2

You can try this:

firstList = ['Product1,item,,description,price|', 'Product2,item,,description,price|','Product3,item,,description,price|']
secondList = secondList = 'Product4,item,,description,price'
final_list = ''.join(firstList+[secondList[0]+"|"]) if isinstance(secondList, list) else ''.join(firstList+[secondList+"|"])

Output:

'Product1,item,,description,price|Product2,item,,description,price|Product3,item,,description,price|Product4,item,,description,price|'

edited Nov 5, 2017 at 1:40

answered Nov 5, 2017 at 0:04

Ajax1234

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7 Comments

mark Over a year ago

Thanks it worked. Is there any option to remove the square bracket and quotes from final output. I've update my output format.

Ajax1234 Over a year ago

@learnjquery you cannot remove the quotes as the value itself is a string. However, please see my recent edit to create a stand-alone string.

mark Over a year ago

its working but after pipe delimiter I'm seeing comma(,) is there any way to remove that too

Code-Apprentice Over a year ago

This assumes that secondList contains exactly one string. A more robust solution will iterate over all the elements of secondList.

mark Over a year ago

Great! Thank you once again

|

be_good_do_good · Accepted Answer · 2017-11-05 00:02:47Z

2

[itm + '|' if not itm.endswith('|') else itm for itm in firstList + secondList]

You can use list comprehension to do that with if-else condition in it

answered Nov 5, 2017 at 0:02

be_good_do_good

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Comments

Code-Apprentice · Accepted Answer · 2017-11-05 00:21:37Z

1

It seems you want to do two different things here. Address each of them separately:

Append '|' to the end of each string in a list. You can do this with a list comprehension.
Concatenate two lists. You can do this with the + operator.

I leave the details as an exercise for the reader. Now that you have some terminology, you can google for more information.

answered Nov 5, 2017 at 0:21

Code-Apprentice

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