Concatenate string using .format

Question

I have some code similar to the following:

test_1 = 'bob'
test_2 = 'jeff'

test_1 += "-" + test_2 + "\n"

Output:

bob- jeff\n

I'd like to have the same functionality but using the .format method.

This is what I have so far:

test_1 = "{}{} {}\n".format(test_1, "-", test_2)

Which produces the same output, but is there a better/more efficient way of using .format. in this case?

Do you need to have the delimiter parameterized..could it be inside the format string? E.g.: "{}- {}\n".format(test_1, test_2)?.. — alecxe
– alecxe, Commented Oct 19, 2016 at 18:17

Nihal Rp · Accepted Answer · 2016-10-19 18:29:01Z

1

''.join is probably fast enough and efficient.

'-'.join((test_1,test_2))

You can measure different methods using the timeit module. That can tell you which is fastest

This is an example of how timeit can be used:-

>>> import timeit
>>> timeit.timeit('"-".join(str(n) for n in range(100))', number=10000)
0.8187260627746582

answered Oct 19, 2016 at 18:29

Nihal Rp

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4 Comments

Nihal Rp Over a year ago

@tinySandy I don't see efficient way of using format, other that what Proletariat came up with. So i just posted another efficient way of doing this. :)

midori Over a year ago

i wouldn't post anything since it's not related to what OP was asking

Proletariat Over a year ago

I appreciate the response but it's not using .format as @tinySandy said.

Nihal Rp Over a year ago

@Proletariat Im sorry, I did not read your question properly. I thought you were just asking if there was any other "better/more efficient" method.

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