List needs to be converted to a string and perform a string operations,
Is there a effective way to convert both the operations into 1,
lista = ['col-1,','col-2,','col-3,']
stra = ' '.join(lista)
stra = stra.rstrip(',')
5 Answers
How about ', '.join(['col-1', 'col-2', 'col-3'])? Then you don't need rstrip at all.
3 Comments
rubik
But you cannot change the input data. Maybe he has to work with that.
nneonneo
Then again, maybe not. Perhaps he assumed
join only works for single characters, and munged the data to add commas. Or maybe you're right and the data is provided in that form. We'll see :)
user1050619
There is a comma after each col,['col-1,','col-2,'], the solution provided by @Rohit worked.
Since your join returns a string.. So, instead of storing it, you can chain one more method call...
stra = ' '.join(Lista).rstrip(',')
Or, better you can do this: -
stra = ' '.join(s.rstrip(',') for s in lista)
This will not print comma(,) in between your list items..
Comments
All string methods return new strings.
stra = " ".join(s.rstrip(",") for s in lista)
or if you only wanted to trim the last comma, just " ".join(lista).rstrip(",").
Comments
Since the join() method returns a string you can chain methods:
stra = ' '.join(lista).rstrip(',') # prints col-1, col-2, col-3
Or, if you want to strip the commas before joining the strings (since you have the comma at the end of every string I'm assuming you want to):
stra = ' '.join(map(lambda s: s.rstrip(','), lista)) # prints col-1 col-2 col-3
or:
stra = ' '.join(s.rstrip(',') for s in lista) # prints col-1 col-2 col-3
Comments
I'm not entirely sure what you mean by "convert both the operations into 1", but if you don't have any control over lista, and can rely on it being in the format specified, then just do
' '.join(lista)[:-1]
If you do have control over lista, then follow nneonneo's suggestion and get rid of the commas in the list.
.rstrip()? There are no commas in yourListaitems..'a b c', there's no,?stra = ' '.join(lista)makes a string from a list. What more do you need?