CODEWITHSUNDEEP
python
wilberox
wilberox

Reputation: 193

adding a string to a single item of a list

I want to prepend the last item of my list BinList with a string less than or equal to. BinList is 10 items long.

I have prepended all the other items in my list with a string less than using this function I wrote: 

def prepend(list, string):
    string += '{0}'
    list = [string.format(i) for i in list]
    return (list)

But I can't use this for a single item in a list.

I tried 

lastbin = BinList[10]
string = 'less than or equal to '
FinalCell = string.format(lastbin)

But this just returns less than or equal to

and not the number of BinList[10] as well.

Upvotes: 0

Views: 106

Answers (2)

OverLordGoldDragon
OverLordGoldDragon

Reputation: 19776

def prepend(list, string, last_string):
    list[:-1] = [(string + str(i)) for i in list[:-1]]
    list[-1] = last_string + str(list[-1])
    return list

prepend([1, 2, 'tank'], 'less than ', 'less than or equal to ')
# ['less than 1', 'less than 2', 'less than or equal to tank']

Upvotes: 1

Jab
Jab

Reputation: 27485

No need to loop or anything just use slicing like your second example but simple assign in the same line. Also BinList[-1] will access the last elemnt in the list:

 BinList[-1] = 'less than or equal to {}'.format(BinList[-1])

You can even make prepend treat the last element in the list apart from the others:

BinList = [1, 2, 3]

def prepend(l, string, last):
    length = len(l)
    return [[last, string][i<length-1].format(s) for i, s in enumerate(l)]

print(prepend(BinList, 'equal to {}', 'less than or equal to {}'))

This returns:

['equal to 1', 'equal to 2', 'less than or equalto 3']

Upvotes: 1

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