Convert and manipulate a list of strings into a string (with extra characters)

Question

Using Python, I would like to convert a list to string looks like this: I'm looking for a more elegant way then loops

cmd = ['cd ..', 'pwd', 'howami']

"cd..; pwd; howami"

Thanks in advance (it is my first question BTW, please be gentle)

Roy

for cmdStr in cmd:     
   cmdString += cmdStr + '; '

cmdString.rstrip('; ')

You need [str.join()](https://docs.python.org/3/library/stdtypes.html#str.join). For example: `"; ".join(cmd)` — Moinuddin Quadri, Oct 31 '22 at 07:01

score 2 · Answer 1 · answered Oct 31 '22 at 07:01

2

You can use the join function.

"; ".join(cmd)

output

cd ..; pwd; howami

answered Oct 31 '22 at 07:01

Origin

score 2 · Answer 2 · answered Oct 31 '22 at 07:02

2

The method you are looking for is join. In your example it would look like this:

cmd = ['cd ..', 'pwd', 'howami']

"; ".join(cmd)

answered Oct 31 '22 at 07:02

w8eight

score 0 · Answer 3 · answered Oct 31 '22 at 07:17

0

Different ways you can use

Using functools.reduce method

from functools import reduce
cmd = ['cd ..', 'pwd', 'howami']
string = reduce(lambda a, b : a+ "; " +str(b), cmd)
print(string)

Using enumerate function

cmd = ['cd ..', 'pwd', 'howami']
string = '; '.join([str(elem) for i,elem in enumerate(cmd)])
print(string)

Using map()

cmd = ['cd ..', 'pwd', 'howami']

string =  '; '.join(map(str, cmd))
print(string)

answered Oct 31 '22 at 07:17

justjokingbro

Using enumerate is not necessary as you are not accessing index anywhere. Ensuring that input is list of strings is fine tho. The option with functools isn't more "elegant" as op mentioned, it adds another import, use lambda function, which makes it less readable. – w8eight Oct 31 '22 at 10:53
yeah you are correct about it .i just showed another ways you can use or you can implement it – justjokingbro Nov 01 '22 at 11:40

3 Answers3