Python 3 Equivalent of '%' String Operator

Question

import collections

Thing = collections.namedtuple('thing', 'color rotation direction')

thing1 = Thing(color = 'blue', rotation = 90, direction = 'south')
thing2 = Thing(color = 'green', rotation = -90, direction = 'west')

for t in [ thing1, thing2 ]:
    print('%s-colored thing rotated %d degrees %s' % t)

Trying to figure out the analogue of Python 2 % string formatting in Python 3. Of course the print() call above works in Python 3, but I've been struggling trying to figure out how to do it using format().

This works, but does not seem very Pythonic:

print('{}-colored thing rotated {} degrees {}'.format(t[0], t[1], t[2]))

I tried

print('{}-colored thing rotated {} degrees {}'.format(t[:]))

but I get

IndexError: tuple index out of range

The Python3 equivalent of % string operator is the % string operator. It has not been removed nor deprecated. — Robᵩ
– Robᵩ, Commented Oct 27, 2015 at 1:38
Why are you asking for an equivalent to something that hasn't been removed or deprecated? If you want to do it with format, then do it with format, but format is not "the equivalent of the % operator". — Mark Reed
– Mark Reed, Commented Oct 27, 2015 at 1:40
My apologies. I thought I read that the % operator was deprecated in Python 3, but clearly I was mistaken. — Tinman
– Tinman, Commented Oct 27, 2015 at 16:37
It's ... complicated. stackoverflow.com/questions/13451989/… — Robᵩ
– Robᵩ, Commented Oct 27, 2015 at 16:50
Thank you, Robᵩ! So it's safe to say that format() is preferred, even though the % operator has not been deprecated. I'll use format(*t) as suggested below. — Tinman
– Tinman, Commented Oct 27, 2015 at 17:31

Robᵩ · Accepted Answer · 2015-10-27 01:39:00Z

4

print('{:s}-colored thing rotated {:d} degrees {:s}'.format(*t))

answered Oct 27, 2015 at 1:39

Robᵩ

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2 Comments

Mark Reed Over a year ago

Note that the :s and :d are optional. OP's original version with the {} would have worked fine with the * operator on the tuple argument.

Robᵩ Over a year ago

Very true. I added them because OP's original code used %s and %d.

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