' at 0x0000014A76371040>'

Question

trying to use if else in a list comprehension expected output is (23.0,23.3,26.0,27.0,0) have tried converting the values to float before diving it with ten but still not worki

    temps= (230,233,260,270,-999)
    new_temps=((temp)/10 if temp != -999 else 0 for temp in temps)
    print(new_temps)

the error I get is <generator object at 0x0000021889021040>

`tuple((temp)/10 if temp != -999 else 0 for temp in temps)` or use `*new_temps` unpacking statment — Davinder Singh, Mar 18 '21 at 03:51
Does this answer your question? [Understanding generators in Python](https://stackoverflow.com/questions/1756096/understanding-generators-in-python) — theProcrastinator, Mar 18 '21 at 04:04

lnogueir · Answer 1 · 2021-03-18T04:04:48.493

3

List comprehension is done with [], not (), the latter is actually the notation to create a generator.

To fix that, just change to []:

temps= (230,233,260,270,-999)
new_temps=tuple([(temp)/10 if temp != -999 else 0 for temp in temps])
print(new_temps)

But if you do want to use the generator notation, you could do this as well:

temps= (230,233,260,270,-999)
new_temps=tuple((temp/10 if temp != -999 else 0 for temp in temps))
print(new_temps)

edited Mar 18 '21 at 04:04

answered Mar 18 '21 at 03:51

lnogueir

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Even with generator it is possible to use `*new_temps` uppacking statement – Davinder Singh Mar 18 '21 at 03:53
1

OP's expected output is tuple as mentioned – Hetal Thaker Mar 18 '21 at 03:54
Yaa for permanent storage that can be done, but nothing is mention – Davinder Singh Mar 18 '21 at 03:55
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Thanks for pointing it out, I didn't notice OP wanted a tuple. Just updated the answer. – lnogueir Mar 18 '21 at 03:56
No need to create list than convert to tuple, directly pass generator to tuple function – Davinder Singh Mar 18 '21 at 03:59
1

Case 1(temporary storage): `new_temps=((temp)/10 if temp != -999 else 0 for temp in temps); print(*new_temps)` – Davinder Singh Mar 18 '21 at 04:05
Just included your approach @ExplooreX – lnogueir Mar 18 '21 at 04:05
1

Case 1(Permanent storage): `new_temps=tuple((temp)/10 if temp != -999 else 0 for temp in temps); print(new_temps)` – Davinder Singh Mar 18 '21 at 04:05

score 1 · Accepted Answer · answered Mar 18 '21 at 04:03

1

There's no need to build an intermediate list comprehension, you can pass a generator to the tuple function:

temps = (230, 233, 260, 270, -999)
new_temps = tuple(temp / 10 if temp != -999 else 0 for temp in temps)
print(new_temps)

answered Mar 18 '21 at 04:03

Francisco

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How is your answer different from @Inoguier's? – theProcrastinator Mar 18 '21 at 04:05

score -1 · Answer 3 · answered Mar 18 '21 at 03:51

-1

If you need to print it, you have to convert it to a list.

    temps= (230,233,260,270,-999)
    new_temps=list((temp)/10 if temp != -999 else 0 for temp in temps)
    print(new_temps)

answered Mar 18 '21 at 03:51

Tim Roberts

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' at 0x0000014A76371040>'

3 Answers3