[Tutor] Nested list comprehensions

[Alan Gauld]

On 18/10/2020 06:39, Manprit Singh wrote:

> Just need to know , if my understanding is correct or not ?

Its hard to know what your understanding is from this example.
Thee are multiple ways to write nested comprehensions.
This example is really just one comprehension embeded
in another. A comprehension is:

[<expression> <for loop> <condition>]

The expression can be any valid Python expression, which
obviously includes a comprehension. The condition likewise
can be any Python expression that evaluates to a thruth-like
value - so that too could be a comprehension. And the for
loop can have multiple elements which is also referred to
as a nested comprehension.

And you can nest comprehensions to an arbitrary number
of levels, resulting in code that is completely
incomprehensible.

Does your understanding encompass all those variety of
nested comprehension?


> def two_d(row, col, ele):
>     return [[ele for _ in range(col)] for _ in range(row)]
> 
> m = int(input("Enter no of rows"))
> n = int(input("Enter no of columns"))
> e = int(input("Enter the element to be placed inside list'))
> two_d(m, n, e)


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