CODEWITHSUNDEEP
pythonlistpython-3.x
Elessar
Elessar

Reputation: 37

Add percentage symbol to all list elements

Hi I have a list like this: [1,2,3,4,5,6]

I want to add "%" to all these elements in the list for a result of [1%,2%,3%,4%,5%,6%].

I know that I can do it with +"%" but how can i do it with .format or another thing?

Upvotes: 0

Views: 4371

Answers (3)

quapka
quapka

Reputation: 2929

Since you've asked: or another thing? I'll give you another thing.

Sometimes, you'd desire something, which seems little bad, like this:

# add method to built-in int class to render ints as percents
as_percent = lambda x: str(x) + '%'
# and then monkey patch it
int.as_percent = as_percent

However you'd end up with this Exception:

TypeError: can't set attributes of built-in/extension type 'int'

But, there is a way..

Before you'd will try the following a little disclaimer:

I've never used this in any actual code, but I find this very fun, and generaly good to know it exists. Having code a little bit in Ruby, I like the idea of monkey patching built-ins. But it is not default behaviour in Python. So, be aware. But at least, try it!

First you need this module forbiddenfruit (see, the name is quite self-explanatory!). Simply pip it.

Then it is quite easy. We'll use the exact same lambda function as_percent as before.

>>> from forbiddenfruit import curse
>>> # again, do you see the name of the function?!
>>> curse(int, 'as_percent', as_percent)
>>> print((1).as_percent())
1%
>>> [x.as_percent() for x in range(10)]
>>> ['0%', '1%', '2%', '3%', '4%', '5%', '6%', '7%', '8%', '9%']

I've come across it here.

Upvotes: 1

Dimitris Fasarakis Hilliard
Dimitris Fasarakis Hilliard

Reputation: 160477

Sure you can do it with format, your results of course need to be strings:

l = [1,2,3,4,5,6]
r = list(map("{}%".format, l))

now, r is:

['1%', '2%', '3%', '4%', '5%', '6%']

Alternatively you could do it with a list-comp as in the other answer or, in place, by looping:

for ind, i in enumerate(l):
    l[ind] = "{}%".format(i)

Upvotes: 2

khelili miliana
khelili miliana

Reputation: 3822

This PyFormat help

['{:d}%'.format(elm) for elm in l]

Output :

['1%', '2%', '3%', '4%', '5%', '6%']

Upvotes: 2

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