Hfrhyu

What does Linus Torvalds mean when he says that Git "never ever" tracks a file?

Does Parliament need to approve the new Brexit delay to 31 October 2019?

What to do when moving next to a bird sanctuary with a loosely-domesticated cat?

Can each chord in a progression create its own key?

Why doesn't a hydraulic lever violate conservation of energy?

Would an alien lifeform be able to achieve space travel if lacking in vision?

ELI5: Why do they say that Israel would have been the fourth country to land a spacecraft on the Moon and why do they call it low cost?

The following signatures were invalid: EXPKEYSIG 1397BC53640DB551

Why can't devices on different VLANs, but on the same subnet, communicate?

How to support a colleague who finds meetings extremely tiring?

What can I do if neighbor is blocking my solar panels intentionally?

Why doesn't shell automatically fix "useless use of cat"?

Deal with toxic manager when you can't quit

Word to describe a time interval

One-dimensional Japanese puzzle

Can the Right Ascension and Argument of Perigee of a spacecraft's orbit keep varying by themselves with time?

Make it rain characters

Didn't get enough time to take a Coding Test - what to do now?

Is there a writing software that you can sort scenes like slides in PowerPoint?

Nested ellipses in tikzpicture: Chomsky hierarchy

Did the UK government pay "millions and millions of dollars" to try to snag Julian Assange?

Drawing vertical/oblique lines in Metrical tree (tikz-qtree, tipa)

Why are PDP-7-style microprogrammed instructions out of vogue?

Is there a way to generate uniformly distributed points on a sphere from a fixed amount of random real numbers per point?

Python: next in for loop

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;

8

2

I want to use next to skip one or more items returned from a generator. Here is a simplified example designed to skip one item per loop (in actual use, I'd test n and depending on the result, may repeat the next() and the generator is from a package I don't control):

def gen():
for i in range(10):
 yield i

for g in gen():
 n = next(gen())
 print(g, n)

I expected the result to be

0 1
2 3

etc.

Instead I got

0 0
1 0

etc.

What am I doing wrong?

python generator next

share|improve this question

asked Apr 6 at 22:08

foosionfoosion

3,340144990

add a comment | 

8

2

I want to use next to skip one or more items returned from a generator. Here is a simplified example designed to skip one item per loop (in actual use, I'd test n and depending on the result, may repeat the next() and the generator is from a package I don't control):

def gen():
for i in range(10):
 yield i

for g in gen():
 n = next(gen())
 print(g, n)

I expected the result to be

0 1
2 3

etc.

Instead I got

0 0
1 0

etc.

What am I doing wrong?

python generator next

share|improve this question

asked Apr 6 at 22:08

foosionfoosion

3,340144990

add a comment | 

I want to use next to skip one or more items returned from a generator. Here is a simplified example designed to skip one item per loop (in actual use, I'd test n and depending on the result, may repeat the next() and the generator is from a package I don't control):

def gen():
for i in range(10):
 yield i

for g in gen():
 n = next(gen())
 print(g, n)

I expected the result to be

0 1
2 3

etc.

Instead I got

0 0
1 0

etc.

What am I doing wrong?

python generator next

share|improve this question

asked Apr 6 at 22:08

foosionfoosion

3,340144990

def gen():
for i in range(10):
 yield i

for g in gen():
 n = next(gen())
 print(g, n)

0 1
2 3

0 0
1 0

share|improve this question

asked Apr 6 at 22:08

foosionfoosion

3,340144990

share|improve this question

asked Apr 6 at 22:08

foosionfoosion

3,340144990

asked Apr 6 at 22:08

foosionfoosion

3,340144990

asked Apr 6 at 22:08

foosionfoosion

3,340144990

1 Answer
1

active

oldest

votes

9

You're making a new generator each time you call gen(). Each new generator starts from 0.

Instead, you can call it once and capture the return value.

def gen():
 for i in range(10):
 yield i

x = gen()
for g in x:
 n = next(x)
 print(g, n)

share|improve this answer

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55553886%2fpython-next-in-for-loop%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

9

You're making a new generator each time you call gen(). Each new generator starts from 0.

Instead, you can call it once and capture the return value.

def gen():
 for i in range(10):
 yield i

x = gen()
for g in x:
 n = next(x)
 print(g, n)

share|improve this answer

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

add a comment | 

9

You're making a new generator each time you call gen(). Each new generator starts from 0.

Instead, you can call it once and capture the return value.

def gen():
 for i in range(10):
 yield i

x = gen()
for g in x:
 n = next(x)
 print(g, n)

share|improve this answer

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

add a comment | 

You're making a new generator each time you call gen(). Each new generator starts from 0.

Instead, you can call it once and capture the return value.

def gen():
 for i in range(10):
 yield i

x = gen()
for g in x:
 n = next(x)
 print(g, n)

share|improve this answer

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

def gen():
 for i in range(10):
 yield i

x = gen()
for g in x:
 n = next(x)
 print(g, n)

share|improve this answer

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465

answered Apr 6 at 22:12

khelwoodkhelwood

32.3k74465