TypeError: 'NoneType' object is not iterable, while appending a list

-1

I have a function which returns a list. But it has nothing to return. I want to handle the TypeError.
I have tried this:

def isLookingAround(lst):

    res = 

    body = 

    for data in lst:

        res += isLookingAt(normalize2(data))

        body += isBodyDirection(normalize2(data))





    if most_body == "front" or most_body == "backward":

        if ('lookL' in res and 'lookR' in res):

            return 'lookingAround'

    elif most_body == "left" or most_body == "right":

        if ('lookF' in res and 'lookB' in res):

            return 'lookingAround'

Error:

    Traceback (most recent call last):

  File "action_detector.py", line 201, in <module>

    write_labels(input_source, labels)

  File "action_detector.py", line 179, in write_labels

    for itr, word in enumerate(lbls):

TypeError: 'NoneType' object is not iterable

I am still getting the error with labels.append(detectors.isLookingAround(back_Data)) . I would appreciate your help.

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

@Jerry Understand, but l is the list which is gonna get appended, and also it's empty, so maybe the OP has another list called list (not a good name)
– U9-Forward
Nov 12 '18 at 5:44

1

I guess your issue coming from detectors.isLookingAround(back_Data)
– Rahul K P
Nov 12 '18 at 5:59

1

But the thing is that appending None to a list does not generate an error. You will have to fix isLookingAround itself. Or alternatively learn when isLookingAround gives the error so you can make sure back_Data does not cause that error.
– Jerry
Nov 12 '18 at 6:06

1

@prb Sure. FWIW, maybe removing the current code would be better since the error is not raised here.
– Jerry
Nov 12 '18 at 6:32

1

Can you also include the full error? It's difficult to pinpoint where the error might be occurring because more functions are being used in isLookingAround.
– Jerry
Nov 12 '18 at 6:58

|
show 8 more comments

-1

I have a function which returns a list. But it has nothing to return. I want to handle the TypeError.
I have tried this:

def isLookingAround(lst):

    res = 

    body = 

    for data in lst:

        res += isLookingAt(normalize2(data))

        body += isBodyDirection(normalize2(data))





    if most_body == "front" or most_body == "backward":

        if ('lookL' in res and 'lookR' in res):

            return 'lookingAround'

    elif most_body == "left" or most_body == "right":

        if ('lookF' in res and 'lookB' in res):

            return 'lookingAround'

Error:

    Traceback (most recent call last):

  File "action_detector.py", line 201, in <module>

    write_labels(input_source, labels)

  File "action_detector.py", line 179, in write_labels

    for itr, word in enumerate(lbls):

TypeError: 'NoneType' object is not iterable

I am still getting the error with labels.append(detectors.isLookingAround(back_Data)) . I would appreciate your help.

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

@Jerry Understand, but l is the list which is gonna get appended, and also it's empty, so maybe the OP has another list called list (not a good name)
– U9-Forward
Nov 12 '18 at 5:44

1

I guess your issue coming from detectors.isLookingAround(back_Data)
– Rahul K P
Nov 12 '18 at 5:59

1

But the thing is that appending None to a list does not generate an error. You will have to fix isLookingAround itself. Or alternatively learn when isLookingAround gives the error so you can make sure back_Data does not cause that error.
– Jerry
Nov 12 '18 at 6:06

1

@prb Sure. FWIW, maybe removing the current code would be better since the error is not raised here.
– Jerry
Nov 12 '18 at 6:32

1

Can you also include the full error? It's difficult to pinpoint where the error might be occurring because more functions are being used in isLookingAround.
– Jerry
Nov 12 '18 at 6:58

|
show 8 more comments

-1

I have a function which returns a list. But it has nothing to return. I want to handle the TypeError.
I have tried this:

def isLookingAround(lst):

    res = 

    body = 

    for data in lst:

        res += isLookingAt(normalize2(data))

        body += isBodyDirection(normalize2(data))





    if most_body == "front" or most_body == "backward":

        if ('lookL' in res and 'lookR' in res):

            return 'lookingAround'

    elif most_body == "left" or most_body == "right":

        if ('lookF' in res and 'lookB' in res):

            return 'lookingAround'

Error:

    Traceback (most recent call last):

  File "action_detector.py", line 201, in <module>

    write_labels(input_source, labels)

  File "action_detector.py", line 179, in write_labels

    for itr, word in enumerate(lbls):

TypeError: 'NoneType' object is not iterable

I am still getting the error with labels.append(detectors.isLookingAround(back_Data)) . I would appreciate your help.

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

I have a function which returns a list. But it has nothing to return. I want to handle the TypeError.
I have tried this:

def isLookingAround(lst):

    res = 

    body = 

    for data in lst:

        res += isLookingAt(normalize2(data))

        body += isBodyDirection(normalize2(data))





    if most_body == "front" or most_body == "backward":

        if ('lookL' in res and 'lookR' in res):

            return 'lookingAround'

    elif most_body == "left" or most_body == "right":

        if ('lookF' in res and 'lookB' in res):

            return 'lookingAround'

Error:

    Traceback (most recent call last):

  File "action_detector.py", line 201, in <module>

    write_labels(input_source, labels)

  File "action_detector.py", line 179, in write_labels

    for itr, word in enumerate(lbls):

TypeError: 'NoneType' object is not iterable

I am still getting the error with labels.append(detectors.isLookingAround(back_Data)) . I would appreciate your help.

python list

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

edited Nov 13 '18 at 7:09

asked Nov 12 '18 at 5:38

prb

9810

asked Nov 12 '18 at 5:38

prb

9810

asked Nov 12 '18 at 5:38

prb

9810

@Jerry Understand, but l is the list which is gonna get appended, and also it's empty, so maybe the OP has another list called list (not a good name)
– U9-Forward
Nov 12 '18 at 5:44

1

I guess your issue coming from detectors.isLookingAround(back_Data)
– Rahul K P
Nov 12 '18 at 5:59

1

But the thing is that appending None to a list does not generate an error. You will have to fix isLookingAround itself. Or alternatively learn when isLookingAround gives the error so you can make sure back_Data does not cause that error.
– Jerry
Nov 12 '18 at 6:06

1

@prb Sure. FWIW, maybe removing the current code would be better since the error is not raised here.
– Jerry
Nov 12 '18 at 6:32

1

Can you also include the full error? It's difficult to pinpoint where the error might be occurring because more functions are being used in isLookingAround.
– Jerry
Nov 12 '18 at 6:58

|
show 8 more comments

@Jerry Understand, but l is the list which is gonna get appended, and also it's empty, so maybe the OP has another list called list (not a good name)
– U9-Forward
Nov 12 '18 at 5:44

1

I guess your issue coming from detectors.isLookingAround(back_Data)
– Rahul K P
Nov 12 '18 at 5:59

1

But the thing is that appending None to a list does not generate an error. You will have to fix isLookingAround itself. Or alternatively learn when isLookingAround gives the error so you can make sure back_Data does not cause that error.
– Jerry
Nov 12 '18 at 6:06

1

@prb Sure. FWIW, maybe removing the current code would be better since the error is not raised here.
– Jerry
Nov 12 '18 at 6:32

1

Can you also include the full error? It's difficult to pinpoint where the error might be occurring because more functions are being used in isLookingAround.
– Jerry
Nov 12 '18 at 6:58

@Jerry Understand, but l is the list which is gonna get appended, and also it's empty, so maybe the OP has another list called list (not a good name)
– U9-Forward
Nov 12 '18 at 5:44

I guess your issue coming from detectors.isLookingAround(back_Data)
– Rahul K P
Nov 12 '18 at 5:59

But the thing is that appending None to a list does not generate an error. You will have to fix isLookingAround itself. Or alternatively learn when isLookingAround gives the error so you can make sure back_Data does not cause that error.
– Jerry
Nov 12 '18 at 6:06

@prb Sure. FWIW, maybe removing the current code would be better since the error is not raised here.
– Jerry
Nov 12 '18 at 6:32

Can you also include the full error? It's difficult to pinpoint where the error might be occurring because more functions are being used in isLookingAround.
– Jerry
Nov 12 '18 at 6:58

|
show 8 more comments

2 Answers
2

active

oldest

votes

To check data is empty. you can use below code

if data:

   l.append(data)

answered Nov 12 '18 at 5:41

Lijo Jose

638

add a comment |

-1

In order to handle the NoneType exception, you can surround the statement within try-except blocks.

For example, you can do something like,

try:

    labels.append(detectors.isLookingAround(back_Data))

except TypeError:

    # Do something. Like,

    return

It will "catch" the error, and then you can handle it properly. However, the error seems to come from isLookingAround method.

You can re-check that, and if you're unable to resolve it, post a new question, I guess.

answered Nov 12 '18 at 6:02

MaJoR

398111

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

1

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

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');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53256437%2ftypeerror-nonetype-object-is-not-iterable-while-appending-a-list%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

To check data is empty. you can use below code

if data:

   l.append(data)

answered Nov 12 '18 at 5:41

Lijo Jose

638

add a comment |

To check data is empty. you can use below code

if data:

   l.append(data)

answered Nov 12 '18 at 5:41

Lijo Jose

638

add a comment |

To check data is empty. you can use below code

if data:

   l.append(data)

answered Nov 12 '18 at 5:41

Lijo Jose

638

To check data is empty. you can use below code

if data:

   l.append(data)

answered Nov 12 '18 at 5:41

Lijo Jose

638

answered Nov 12 '18 at 5:41

Lijo Jose

638

answered Nov 12 '18 at 5:41

Lijo Jose

638

answered Nov 12 '18 at 5:41

Lijo Jose

638

add a comment |

-1

In order to handle the NoneType exception, you can surround the statement within try-except blocks.

For example, you can do something like,

try:

    labels.append(detectors.isLookingAround(back_Data))

except TypeError:

    # Do something. Like,

    return

It will "catch" the error, and then you can handle it properly. However, the error seems to come from isLookingAround method.

You can re-check that, and if you're unable to resolve it, post a new question, I guess.

answered Nov 12 '18 at 6:02

MaJoR

398111

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

1

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

add a comment |

-1

In order to handle the NoneType exception, you can surround the statement within try-except blocks.

For example, you can do something like,

try:

    labels.append(detectors.isLookingAround(back_Data))

except TypeError:

    # Do something. Like,

    return

It will "catch" the error, and then you can handle it properly. However, the error seems to come from isLookingAround method.

You can re-check that, and if you're unable to resolve it, post a new question, I guess.

answered Nov 12 '18 at 6:02

MaJoR

398111

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

1

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

add a comment |

-1

In order to handle the NoneType exception, you can surround the statement within try-except blocks.

For example, you can do something like,

try:

    labels.append(detectors.isLookingAround(back_Data))

except TypeError:

    # Do something. Like,

    return

It will "catch" the error, and then you can handle it properly. However, the error seems to come from isLookingAround method.

You can re-check that, and if you're unable to resolve it, post a new question, I guess.

answered Nov 12 '18 at 6:02

MaJoR

398111

In order to handle the NoneType exception, you can surround the statement within try-except blocks.

For example, you can do something like,

try:

    labels.append(detectors.isLookingAround(back_Data))

except TypeError:

    # Do something. Like,

    return

It will "catch" the error, and then you can handle it properly. However, the error seems to come from isLookingAround method.

You can re-check that, and if you're unable to resolve it, post a new question, I guess.

answered Nov 12 '18 at 6:02

MaJoR

398111

answered Nov 12 '18 at 6:02

MaJoR

398111

answered Nov 12 '18 at 6:02

MaJoR

398111

answered Nov 12 '18 at 6:02

MaJoR

398111

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

1

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

add a comment |

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

1

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

I have already tried this. I am not able to handle it. Maybe there is a problem with the function
– prb
Nov 12 '18 at 6:06

Are you sure that the exception is occurring here? Maybe post a stacktrace here..
– MaJoR
Nov 12 '18 at 6:11

add a comment |

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

Some of your past answers have not been well-received, and you're in danger of being blocked from answering.

Please pay close attention to the following guidance:

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

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

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

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

Post as a guest

Name

Required, but never shown

Sign up or log in

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

Post as a guest

Name

Required, but never shown

Sign up or log in

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

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Wsrtjtyk