How is this code getting executed in python ? What is the sequence of execution with multiple for loops here? [duplicate]

Question

a = np.array(
    [
        [
            [
                get_score(weights[i][k], vec, y)
                for vec in get_vector()
            ]
            for k in range(x)
        ]
        for i in range(y)
    ]
)

How is the execution sequence in this code ?

Running your code I get following sequence of execution (assuming numpy was imported): A NameError in line 4, then the execution stops. — Michael Szczesny
– Michael Szczesny, Commented Feb 19, 2022 at 8:07

Gal Toubul · Accepted Answer · 2022-02-19 08:02:37Z

3

It is eqivalent to this:

a = []
for i in range(y):
    for k in range(x):
        for vec in get_vector():
            a.append(get_score(weights[i][k], vec, y))
a = np.array(a)

answered Feb 19, 2022 at 8:02

Gal Toubul

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2 Comments

honolulu Over a year ago

does the sequence of for loops matter or they could be run in any sequence ?

Pychopath Over a year ago

@honolulu Well try different sequences, and you'll see it matters. You'll also see that this is obviously not equivalent (builds a 1D structure instead of a 3D structure) and that it's a mystery how this got two upvotes.

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