CODEWITHSUNDEEP
pythonlistappend
workinbwithmongp
workinbwithmongp

Reputation: 1

Unexpected result printed after appended to a list

This is my code:

temps = (345, 9876, 23, 100, 567)

new_temps = (temps / 10 for temp in temps)
print(new_temps)

The result is an error...

<generator object <genexpr> at 0x7fc8101f76d0>

Upvotes: 0

Views: 64

Answers (5)

alani
alani

Reputation: 13059

You are using a generator expression.

Either you need to use the corresponding list comprehension by using [ ... ] instead of ( ... ):

temps = (345, 9876, 23, 100, 567)
new_temps = [temp / 10 for temp in temps]
print(new_temps)

gives

[34.5, 987.6, 2.3, 10.0, 56.7]

or you need to iterate over the generator:

temps = (345, 9876, 23, 100, 567)
new_temps = (temp / 10 for temp in temps)
for temp in new_temps:
    print(temp)

gives

34.5
987.6
2.3
10.0
56.7

You can also just convert it to a list (which works by iterating over it):

temps = (345, 9876, 23, 100, 567)
new_temps = (temp / 10 for temp in temps)
print(list(new_temps))

gives

[34.5, 987.6, 2.3, 10.0, 56.7]

(Iterating e.g. with a for loop will also work with the list comprehension used in the first option, although if you have a lot of items and all you are going to do is iterate once over it, then it is more efficient on memory to use the ( ... ) form.)

I have also corrected a bug in the generator expression - should be temp / 10, not temps / 10.

Upvotes: 0

The AG
The AG

Reputation: 690

if you want to convert temps into list you can use:

list(temps)

Out: [345, 9876, 23, 100, 567]

But you can achieve your requirement without any conversion using list comprehension you can get your answer:

temps = (345, 9876, 23, 100, 567)
new_temps = [temp / 10 for temp in temps]
print(new_temps)

Out: [34.5, 987.6, 2.3, 10.0, 56.7]

Upvotes: 0

Yorfrank Bastidas
Yorfrank Bastidas

Reputation: 354

You declare lists in python with [ ], also your for is calling all your list, not the element, which is "temp" not "tempts". It would be like this:

temps = [345, 9876, 23, 100, 567]
new_temps = [temp / 10 for temp in temps]
print(new_temps)
>> [34.5, 987.6, 2.3, 10.0, 56.7]

Good luck with your travel in Python!

Upvotes: 0

chepner
chepner

Reputation: 530960

First, temps is a tuple, not a list. A list would use square brackets:

temps = [345, 9876, 23, 100, 567]

For your use, it doesn't matter if it is a tuple or list, though.

Second, (temps / 10 for temp in temps) is a generator expression, not a list comprehension. You want

new_temps = [temps/10 for temp in temps]

Upvotes: 0

ShadowRanger
ShadowRanger

Reputation: 155353

Using parentheses around a comprehension makes it a generator expression; if you want a list comprehension, use square brackets:

new_temps = [temps / 10 for temp in temps]

Side-note: Your original temps isn't a list either (because you used parentheses, not square brackets as the delimiter); it's a tuple (similar to a list, but immutable). It works just fine in this case since you're not trying to modify it.

Upvotes: 2

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