If a is (1,2,3) (a)what is the difference(if any) between a*3 and (a,a,a)?
(b)is a *3 equivalent to a+a+a?
(c)what is the meaning of a[1:1]?
(d) what is the difference between
Answers
Given a=(1, 2, 3)
1. Difference(if any) between a*3 and (a,a,a).
The difference is that a*3 repeats the elements for 3 times in the given order as a whole and encloses them into the given iterable, i.e., tuple. While (a, a, a) is nothing but the enclosing of iterables, i.e., tuples a - as it is - into a new tuple.
a*3 = (1, 2, 3, 1, 2, 3, 1, 2, 3)
(a, a, a) = ( (1, 2, 3), (1, 2, 3), (1, 2, 3) )
2. Is a*3 equivalent to a+a+a?
Yes! Both are equivalent to each other. a*3 triples the elements in the iterables in the same order as they are and encloses them into the defined iterable, i.e., tuple. Similarly, a+a+a is nothing but the concatenation of elements of the tuples in the same order, making the whole - as a single tuple.
a*3 = (1, 2, 3, 1, 2, 3, 1, 2, 3)
a+a+a = (1, 2, 3) + (1, 2, 3) + (1, 2, 3) = (1, 2, 3, 1, 2, 3, 1, 2, 3)
So, a*3 == a+a+a results True as they are equivalent to each other.
3. Meaning of a[1:1]
It comes under the slicing concept. iterable[a:b] returns the elements of the iterable starting from index a to index b, while the element at index b is excluded. i.e, elements from a to b-1 indices are printed.
If we see here, a[1:1] contains starting and ending indices same. As the index 1 element is excluded as it is the ending point, the slice a[1:1] results in an empty tuple.
a[1:1] = ()
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