Can You Refer to an Outer Loop Iterator Inside a Nested List Comprehension in Python?

Double Iteration in List Comprehension [duplicate]

In list comprehensions, Python allows multiple iterators, such as:

<code class="python">[(x, y) for x in a for y in b]</code>

However, can one iterator refer to the other within the comprehension? For example, could we have something like this:

<code class="python">[x for x in a for a in b]</code>

Where the current value of the outer loop is the iterator of the inner?

This behavior is not possible in Python list comprehensions. The code provided would result in a syntax error. List comprehensions require each variable to be defined using a distinct iterator. Therefore, the example provided would not produce the desired result of [1, 2, 3, 4].

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