python using yield from in a function

Question

i have a list like:

list=['2,130.00','2,140.00','2,150.00','2,160.00']

i would like to use a function like

def f(iterable):
    yield from iterable

and applying

float(item.replace(',','')) for item in iterable

at the same time so that

f(list)

returns

[2130.00,2140.00,2150.00,2160.00]

I know

[float(x.replace(',','')) for x in list]

works here but it is to understand how to use yield from in a function and modifying items in the iterable at the same time. Maybe i have to use *args and/or **kwargs in the function but not sure i have and how to.

What isn't working here?

Holloway
– Holloway

2014-09-22 10:31:55 +00:00
Commented Sep 22, 2014 at 10:31 — Holloway
– Holloway, Commented Sep 22, 2014 at 10:31

Pavel Šimerda · Accepted Answer · 2014-09-22 11:08:46Z

3

yield from is a pass-through; you are delegating to the iterable. Either wrap the iterable in a generator expression to transform elements, or don't use yield from but an explicit loop:

def f(iterable):
    yield from (i.replace(',', '') for i in iterable)

or

def f(iterable):
    for item in iterable:
        yield item.replace(',', '')

edited Sep 22, 2014 at 11:08

Pavel Šimerda

6,2641 gold badge36 silver badges33 bronze badges

answered Sep 22, 2014 at 10:33

Martijn Pieters

1.1m325 gold badges4.2k silver badges3.4k bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

addequttorr Over a year ago

thanks so in the end yield from is not very useful in this type of context

Martijn Pieters Over a year ago

@addequttorr: yield from is extremely useful when delegating to other generators. It is not the right tool for transforming the data from another iterable.

addequttorr Over a year ago

Are there any post documenting this?

Martijn Pieters Over a year ago

@addequttorr: Difference between `yield from foo()` and `for x in foo(): yield x`

Collectives™ on Stack Overflow

python using yield from in a function

1 Answer 1

4 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Linked

Related