logging.debug() is printing something different than regular print()
2
I have written a code to find the factorial,i used the logging module.
after searching the site, i haven't found relative questions .
here is my code
def factorial(n):
logging.basicConfig(level=logging.DEBUG,format='%(asctime)s-%(levelname)s-%(message)s')
logging.debug('Start of program')
logging.debug('start of action (%s)'%(n))
total=1
for i in range(1,n+1):
#print(i)
total *=i
print(total)
logging.debug('i is '+str(i)+' total='+str(total))
logging.debug('End of factorial(%s) '%(n))
return total
def main():
print(factorial(5))
logging.debug('End of program')
if __name__=='__main__':
import logging
main()
the output of total is not 'what it should be' in the
logging.debug('i is '+str(i)+' total='+str(total))
here is what i get when i run the code
2018-11-21 09:34:56,213-DEBUG-Start of program
2018-11-21 09:34:56,213-DEBUG-start of action (5)
1
2018-11-21 09:34:56,213-DEBUG-i is 1 total=12
2018-11-21 09:34:56,213-DEBUG-i is 2 total=2
6
2018-11-21 09:34:56,213-DEBUG-i is 3 total=6
24
2018-11-21 09:34:56,213-DEBUG-i is 4 total=24
120
2018-11-21 09:34:56,213-DEBUG-i is 5 total=120
2018-11-21 09:34:56,213-DEBUG-End of factorial(5)
120
2018-11-21 09:34:56,213-DEBUG-End of program
The question seems long but it should be quite simple operations.
python python-3.x
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
|
show 4 more comments
2
I have written a code to find the factorial,i used the logging module.
after searching the site, i haven't found relative questions .
here is my code
def factorial(n):
logging.basicConfig(level=logging.DEBUG,format='%(asctime)s-%(levelname)s-%(message)s')
logging.debug('Start of program')
logging.debug('start of action (%s)'%(n))
total=1
for i in range(1,n+1):
#print(i)
total *=i
print(total)
logging.debug('i is '+str(i)+' total='+str(total))
logging.debug('End of factorial(%s) '%(n))
return total
def main():
print(factorial(5))
logging.debug('End of program')
if __name__=='__main__':
import logging
main()
the output of total is not 'what it should be' in the
logging.debug('i is '+str(i)+' total='+str(total))
here is what i get when i run the code
2018-11-21 09:34:56,213-DEBUG-Start of program
2018-11-21 09:34:56,213-DEBUG-start of action (5)
1
2018-11-21 09:34:56,213-DEBUG-i is 1 total=12
2018-11-21 09:34:56,213-DEBUG-i is 2 total=2
6
2018-11-21 09:34:56,213-DEBUG-i is 3 total=6
24
2018-11-21 09:34:56,213-DEBUG-i is 4 total=24
120
2018-11-21 09:34:56,213-DEBUG-i is 5 total=120
2018-11-21 09:34:56,213-DEBUG-End of factorial(5)
120
2018-11-21 09:34:56,213-DEBUG-End of program
The question seems long but it should be quite simple operations.
python python-3.x
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04
|
show 4 more comments
2
2
2
I have written a code to find the factorial,i used the logging module.
after searching the site, i haven't found relative questions .
here is my code
def factorial(n):
logging.basicConfig(level=logging.DEBUG,format='%(asctime)s-%(levelname)s-%(message)s')
logging.debug('Start of program')
logging.debug('start of action (%s)'%(n))
total=1
for i in range(1,n+1):
#print(i)
total *=i
print(total)
logging.debug('i is '+str(i)+' total='+str(total))
logging.debug('End of factorial(%s) '%(n))
return total
def main():
print(factorial(5))
logging.debug('End of program')
if __name__=='__main__':
import logging
main()
the output of total is not 'what it should be' in the
logging.debug('i is '+str(i)+' total='+str(total))
here is what i get when i run the code
2018-11-21 09:34:56,213-DEBUG-Start of program
2018-11-21 09:34:56,213-DEBUG-start of action (5)
1
2018-11-21 09:34:56,213-DEBUG-i is 1 total=12
2018-11-21 09:34:56,213-DEBUG-i is 2 total=2
6
2018-11-21 09:34:56,213-DEBUG-i is 3 total=6
24
2018-11-21 09:34:56,213-DEBUG-i is 4 total=24
120
2018-11-21 09:34:56,213-DEBUG-i is 5 total=120
2018-11-21 09:34:56,213-DEBUG-End of factorial(5)
120
2018-11-21 09:34:56,213-DEBUG-End of program
The question seems long but it should be quite simple operations.
python python-3.x
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
I have written a code to find the factorial,i used the logging module.
after searching the site, i haven't found relative questions .
here is my code
def factorial(n):
logging.basicConfig(level=logging.DEBUG,format='%(asctime)s-%(levelname)s-%(message)s')
logging.debug('Start of program')
logging.debug('start of action (%s)'%(n))
total=1
for i in range(1,n+1):
#print(i)
total *=i
print(total)
logging.debug('i is '+str(i)+' total='+str(total))
logging.debug('End of factorial(%s) '%(n))
return total
def main():
print(factorial(5))
logging.debug('End of program')
if __name__=='__main__':
import logging
main()
the output of total is not 'what it should be' in the
logging.debug('i is '+str(i)+' total='+str(total))
here is what i get when i run the code
2018-11-21 09:34:56,213-DEBUG-Start of program
2018-11-21 09:34:56,213-DEBUG-start of action (5)
1
2018-11-21 09:34:56,213-DEBUG-i is 1 total=12
2018-11-21 09:34:56,213-DEBUG-i is 2 total=2
6
2018-11-21 09:34:56,213-DEBUG-i is 3 total=6
24
2018-11-21 09:34:56,213-DEBUG-i is 4 total=24
120
2018-11-21 09:34:56,213-DEBUG-i is 5 total=120
2018-11-21 09:34:56,213-DEBUG-End of factorial(5)
120
2018-11-21 09:34:56,213-DEBUG-End of program
The question seems long but it should be quite simple operations.
python python-3.x
python python-3.x
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
asked Nov 21 '18 at 7:43
wishmasterwishmaster
1589
1589
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04
|
show 4 more comments
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04
|
show 4 more comments
1 Answer
1
active
oldest
votes
0
This is a guess but it looks like you have a race condition within your prints. I actually thought logging takes case of this but to check you can try the following:
remove the print statement and run the program. If the program is correct remove the debug and return the print to check again.
The possible (apparently) race condition is that while the logging.debug didn't finish printing the whole line your code now did the print statement. thats why you have empty lines.
answered Nov 21 '18 at 8:20
EytanEytan
301113
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.printshould only return after having finished all operations.
– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53407338%2flogging-debug-is-printing-something-different-than-regular-print%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
This is a guess but it looks like you have a race condition within your prints. I actually thought logging takes case of this but to check you can try the following:
remove the print statement and run the program. If the program is correct remove the debug and return the print to check again.
The possible (apparently) race condition is that while the logging.debug didn't finish printing the whole line your code now did the print statement. thats why you have empty lines.
answered Nov 21 '18 at 8:20
EytanEytan
301113
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.printshould only return after having finished all operations.
– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
add a comment |
0
This is a guess but it looks like you have a race condition within your prints. I actually thought logging takes case of this but to check you can try the following:
remove the print statement and run the program. If the program is correct remove the debug and return the print to check again.
The possible (apparently) race condition is that while the logging.debug didn't finish printing the whole line your code now did the print statement. thats why you have empty lines.
answered Nov 21 '18 at 8:20
EytanEytan
301113
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.printshould only return after having finished all operations.
– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
add a comment |
0
0
0
This is a guess but it looks like you have a race condition within your prints. I actually thought logging takes case of this but to check you can try the following:
remove the print statement and run the program. If the program is correct remove the debug and return the print to check again.
The possible (apparently) race condition is that while the logging.debug didn't finish printing the whole line your code now did the print statement. thats why you have empty lines.
answered Nov 21 '18 at 8:20
EytanEytan
301113
This is a guess but it looks like you have a race condition within your prints. I actually thought logging takes case of this but to check you can try the following:
remove the print statement and run the program. If the program is correct remove the debug and return the print to check again.
The possible (apparently) race condition is that while the logging.debug didn't finish printing the whole line your code now did the print statement. thats why you have empty lines.
answered Nov 21 '18 at 8:20
EytanEytan
301113
answered Nov 21 '18 at 8:20
EytanEytan
301113
answered Nov 21 '18 at 8:20
EytanEytan
301113
answered Nov 21 '18 at 8:20
EytanEytan
301113
301113
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.printshould only return after having finished all operations.
– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
add a comment |
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.printshould only return after having finished all operations.
– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
it does fix it,total is now consistent and correct. i wonder why it was giving those results with the print() on line 9 of code.
– wishmaster
Nov 21 '18 at 9:14
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
@timmy It is a very classic race condition where the shared resource is the screen (printing stream). To learn more you can look here: en.wikipedia.org/wiki/Race_condition#Software If the answer helped you please accept it.
– Eytan
Nov 21 '18 at 10:34
A race condition implies concurrent work.
print should only return after having finished all operations.– MisterMiyagi
Nov 21 '18 at 10:41
A race condition implies concurrent work.
print should only return after having finished all operations.– MisterMiyagi
Nov 21 '18 at 10:41
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
@MisterMiyagi it looks like a duck and quaks like a duck. I suspect it is the debug print that is problamatic here. Don't know the implementation though so it is still a guess.
– Eytan
Nov 22 '18 at 16:35
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.
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53407338%2flogging-debug-is-printing-something-different-than-regular-print%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
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
Required, but never shown
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
Required, but never shown
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
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
So what is the problem?
– Tobias Wilfert
Nov 21 '18 at 7:45
It looks correct, except for the line where the IO is [presumably] interleaved so it [reportedly] results in 1<NONEWLINE>2<NEWLINE><NEWLINE> instead of 1<NEWLINE>2<NEWLINE>; same for the line with 120 near the bottom.
– user2864740
Nov 21 '18 at 7:46
@TobiasWilfert the total is not corret check the first line of output the total should be 1
– wishmaster
Nov 21 '18 at 7:56
@timmy the output is 1 the 2 just doesn't get a new line and moves up to the 1 for some reason resulting in a "12" and an empty next line.
– Tobias Wilfert
Nov 21 '18 at 8:03
@user2864740 the problem i am having that each time i run it,the total in the logging.debug(...) is very different.
– wishmaster
Nov 21 '18 at 8:04