Simplifying units in pint without changing the magnitude
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
Working with python-pint, let's suppose I have a quantity defined as
<Quantity(1.0, 'gram * kilopascal / joule')>
which is equivalent to kilogram/m3. Now, when I try to get that using to_base_units i get:
den.to_base_units()
<Quantity(1000.0, 'gram / meter ** 3')>
which is fine, except I wished the magnitude was still 1, and the units were, instead, <Quantity(1.0, 'kilogram / meter ** 3')>, for user-friendliness purposes. Is there a way to achieve that?
By the way, this happens with many different units throughout my program and there's no (easy) way to know which are the correct units for it to be converted to, which prevents me from using convert_to method. In this case it should change from 1000 gram to kilogram, for example, but in the next case it can be from 0.001 meter to 1 milimeter and so on.
I know that pint 0.7 (I'm still using 0.6) has a new system option, but I also couldn't solve it with that.
Cheers
python units-of-measurement pint
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
add a comment |
Working with python-pint, let's suppose I have a quantity defined as
<Quantity(1.0, 'gram * kilopascal / joule')>
which is equivalent to kilogram/m3. Now, when I try to get that using to_base_units i get:
den.to_base_units()
<Quantity(1000.0, 'gram / meter ** 3')>
which is fine, except I wished the magnitude was still 1, and the units were, instead, <Quantity(1.0, 'kilogram / meter ** 3')>, for user-friendliness purposes. Is there a way to achieve that?
By the way, this happens with many different units throughout my program and there's no (easy) way to know which are the correct units for it to be converted to, which prevents me from using convert_to method. In this case it should change from 1000 gram to kilogram, for example, but in the next case it can be from 0.001 meter to 1 milimeter and so on.
I know that pint 0.7 (I'm still using 0.6) has a new system option, but I also couldn't solve it with that.
Cheers
python units-of-measurement pint
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
1
Is there a.convert_to(unit)method that you could call likeq.convert_to('kilogram / meter ** 3')
– Daenyth
May 20 '16 at 18:00
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
This is interesting, but I think this would eventually return<Quantity(0.001, 'kilogram')>for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).
– TomCho
May 20 '16 at 18:25
add a comment |
Working with python-pint, let's suppose I have a quantity defined as
<Quantity(1.0, 'gram * kilopascal / joule')>
which is equivalent to kilogram/m3. Now, when I try to get that using to_base_units i get:
den.to_base_units()
<Quantity(1000.0, 'gram / meter ** 3')>
which is fine, except I wished the magnitude was still 1, and the units were, instead, <Quantity(1.0, 'kilogram / meter ** 3')>, for user-friendliness purposes. Is there a way to achieve that?
By the way, this happens with many different units throughout my program and there's no (easy) way to know which are the correct units for it to be converted to, which prevents me from using convert_to method. In this case it should change from 1000 gram to kilogram, for example, but in the next case it can be from 0.001 meter to 1 milimeter and so on.
I know that pint 0.7 (I'm still using 0.6) has a new system option, but I also couldn't solve it with that.
Cheers
python units-of-measurement pint
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
Working with python-pint, let's suppose I have a quantity defined as
<Quantity(1.0, 'gram * kilopascal / joule')>
which is equivalent to kilogram/m3. Now, when I try to get that using to_base_units i get:
den.to_base_units()
<Quantity(1000.0, 'gram / meter ** 3')>
which is fine, except I wished the magnitude was still 1, and the units were, instead, <Quantity(1.0, 'kilogram / meter ** 3')>, for user-friendliness purposes. Is there a way to achieve that?
By the way, this happens with many different units throughout my program and there's no (easy) way to know which are the correct units for it to be converted to, which prevents me from using convert_to method. In this case it should change from 1000 gram to kilogram, for example, but in the next case it can be from 0.001 meter to 1 milimeter and so on.
I know that pint 0.7 (I'm still using 0.6) has a new system option, but I also couldn't solve it with that.
Cheers
python units-of-measurement pint
python units-of-measurement pint
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
edited May 20 '16 at 18:07
TomCho
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
asked May 20 '16 at 17:58
TomChoTomCho
1,4691235
1,4691235
1
Is there a.convert_to(unit)method that you could call likeq.convert_to('kilogram / meter ** 3')
– Daenyth
May 20 '16 at 18:00
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
This is interesting, but I think this would eventually return<Quantity(0.001, 'kilogram')>for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).
– TomCho
May 20 '16 at 18:25
add a comment |
1
Is there a.convert_to(unit)method that you could call likeq.convert_to('kilogram / meter ** 3')
– Daenyth
May 20 '16 at 18:00
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
This is interesting, but I think this would eventually return<Quantity(0.001, 'kilogram')>for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).
– TomCho
May 20 '16 at 18:25
1
1
Is there a
.convert_to(unit) method that you could call like q.convert_to('kilogram / meter ** 3')– Daenyth
May 20 '16 at 18:00
Is there a
.convert_to(unit) method that you could call like q.convert_to('kilogram / meter ** 3')– Daenyth
May 20 '16 at 18:00
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
This is interesting, but I think this would eventually return
<Quantity(0.001, 'kilogram')> for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).– TomCho
May 20 '16 at 18:25
This is interesting, but I think this would eventually return
<Quantity(0.001, 'kilogram')> for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).– TomCho
May 20 '16 at 18:25
add a comment |
1 Answer
1
active
oldest
votes
First of all, gram is no longer treated as a base unit in Pint 0.8.1. Instead, Pint treats the kilogram as a base unit which is according to the SI standard:
>>> x = 0.1*ureg['g kpascal / J']
>>> print(x.to_base_units())
0.1 kilogram / meter ** 3
Second, I think you may have mixed up two things, getting a quantity in base units, and getting a convenient prefix. to_base_units() is not about getting a convenient prefix, but about getting the quantity in terms of base units (m, s, kg, A, K, mol and cd in the SI system). If you want a convenient prefix you may want to consider to_compact():
>>> print(x.to_base_units().to_compact())
100.0 gram / meter ** 3
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
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
);
);
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%2f37353037%2fsimplifying-units-in-pint-without-changing-the-magnitude%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
First of all, gram is no longer treated as a base unit in Pint 0.8.1. Instead, Pint treats the kilogram as a base unit which is according to the SI standard:
>>> x = 0.1*ureg['g kpascal / J']
>>> print(x.to_base_units())
0.1 kilogram / meter ** 3
Second, I think you may have mixed up two things, getting a quantity in base units, and getting a convenient prefix. to_base_units() is not about getting a convenient prefix, but about getting the quantity in terms of base units (m, s, kg, A, K, mol and cd in the SI system). If you want a convenient prefix you may want to consider to_compact():
>>> print(x.to_base_units().to_compact())
100.0 gram / meter ** 3
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
add a comment |
First of all, gram is no longer treated as a base unit in Pint 0.8.1. Instead, Pint treats the kilogram as a base unit which is according to the SI standard:
>>> x = 0.1*ureg['g kpascal / J']
>>> print(x.to_base_units())
0.1 kilogram / meter ** 3
Second, I think you may have mixed up two things, getting a quantity in base units, and getting a convenient prefix. to_base_units() is not about getting a convenient prefix, but about getting the quantity in terms of base units (m, s, kg, A, K, mol and cd in the SI system). If you want a convenient prefix you may want to consider to_compact():
>>> print(x.to_base_units().to_compact())
100.0 gram / meter ** 3
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
add a comment |
First of all, gram is no longer treated as a base unit in Pint 0.8.1. Instead, Pint treats the kilogram as a base unit which is according to the SI standard:
>>> x = 0.1*ureg['g kpascal / J']
>>> print(x.to_base_units())
0.1 kilogram / meter ** 3
Second, I think you may have mixed up two things, getting a quantity in base units, and getting a convenient prefix. to_base_units() is not about getting a convenient prefix, but about getting the quantity in terms of base units (m, s, kg, A, K, mol and cd in the SI system). If you want a convenient prefix you may want to consider to_compact():
>>> print(x.to_base_units().to_compact())
100.0 gram / meter ** 3
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
First of all, gram is no longer treated as a base unit in Pint 0.8.1. Instead, Pint treats the kilogram as a base unit which is according to the SI standard:
>>> x = 0.1*ureg['g kpascal / J']
>>> print(x.to_base_units())
0.1 kilogram / meter ** 3
Second, I think you may have mixed up two things, getting a quantity in base units, and getting a convenient prefix. to_base_units() is not about getting a convenient prefix, but about getting the quantity in terms of base units (m, s, kg, A, K, mol and cd in the SI system). If you want a convenient prefix you may want to consider to_compact():
>>> print(x.to_base_units().to_compact())
100.0 gram / meter ** 3
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
answered Nov 15 '18 at 9:00
sigvaldmsigvaldm
268110
268110
add a comment |
add a comment |
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.
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%2f37353037%2fsimplifying-units-in-pint-without-changing-the-magnitude%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
1
Is there a
.convert_to(unit)method that you could call likeq.convert_to('kilogram / meter ** 3')– Daenyth
May 20 '16 at 18:00
That's a good idea for this case specifically, but this happens with many different units and there's no (easy) way to know which are the correct units for it to be converted to. I'll make that fact more explicit in my question.
– TomCho
May 20 '16 at 18:03
You need to redefine base mass unit from gram to kilogram. GitHub issue may be helpful.
– Łukasz Rogalski
May 20 '16 at 18:15
This is interesting, but I think this would eventually return
<Quantity(0.001, 'kilogram')>for one gram, wouldn't it? I'd like to avoid any quantities from have magnitudes different from 1 (except, of course, when it's not possible).– TomCho
May 20 '16 at 18:25