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I'm trying to use the str.format() method, and having some difficulties when my values are stored within a tuple. For example, if I do:
s = "x{}y{}z{}"
s.format(1,2,3)
Then I get 'x1y2z3' - no problem.
However, when I try:
s = "x{}y{}z{}"
tup = (1,2,3)
s.format(tup)
I get
IndexError: tuple index out of range.
So how can I 'convert' the tuple into separate variables? or any other workaround ideas?
296
Tuple is a collection which is ordered and unchangeable. Allows duplicate members.
Initial approach that can be applied is that we can iterate on each tuple and check it's count in list using count() , if greater than one, we can add to list. To remove multiple additions, we can convert the result to set using set() .
We can use + operator to combine two tuples. This is called concatenation. We can also repeat the elements in a tuple for a given number of times using the * operator.
By using the * operator we can replicate our tuples by the number of times we specify, creating new tuples based on the original data sequence. Existing tuples can be concatenated or multiplied to form new tuples through using the + and * operators.
Pass in the tuple using *arg variable arguments call syntax:
s = "x{}y{}z{}"
tup = (1,2,3)
s.format(*tup)
The * before tup tells Python to unpack the tuple into separate arguments, as if you called s.format(tup[0], tup[1], tup[2]) instead.
Or you can index the first positional argument:
s = "x{0[0]}y{0[1]}z{0[2]}"
tup = (1,2,3)
s.format(tup)
Demo:
>>> tup = (1,2,3)
>>> s = "x{}y{}z{}"
>>> s.format(*tup)
'x1y2z3'
>>> s = "x{0[0]}y{0[1]}z{0[2]}"
>>> s.format(tup)
'x1y2z3'
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