How do I keep the dtype intact of a kwarg?
up vote
0
down vote
favorite
For a script that I am working on I want to make it optional to pass on an array to a function. The way in which I have attempted to do this is by making the variable in question (residue) a kwarg.
The problem is that when I do it in this way, python changes de dtype of the kwarg from a numpy.ndarray to dict. The simplest solution is to convert the variable back to a np.array using:
residue = np.array(residue.values())
But I do not find this a very elegant solution. So I was wondering if someone could show me a "prettier" way to accomplish this and possibly explain to my why python does this?
The function in question is:
#Returns a function for a 2D Gaussian model
def Gaussian_model2D(data,x_box,y_box,amplitude,x_stddev,y_stddev,theta,**residue):
if not residue:
x_mean, y_mean = max_pixel(data) # Returns location of maximum pixel value
else:
x_mean, y_mean = max_pixel(residue) # Returns location of maximum pixel value
g_init = models.Gaussian2D(amplitude,x_mean,y_mean,x_stddev,y_stddev,theta)
return g_init
# end of Gaussian_model2D
The function is called with the following command:
g2_init = Gaussian_model2D(cut_out,x_box,y_box,amp,x_stddev,y_stddev,theta,residue=residue1)
The version of Python that I am working in is 2.7.15
python python-2.7 dictionary kwargs numpy-ndarray
asked Nov 19 at 17:50
Crispyvb
31
|
show 1 more comment
up vote
0
down vote
favorite
For a script that I am working on I want to make it optional to pass on an array to a function. The way in which I have attempted to do this is by making the variable in question (residue) a kwarg.
The problem is that when I do it in this way, python changes de dtype of the kwarg from a numpy.ndarray to dict. The simplest solution is to convert the variable back to a np.array using:
residue = np.array(residue.values())
But I do not find this a very elegant solution. So I was wondering if someone could show me a "prettier" way to accomplish this and possibly explain to my why python does this?
The function in question is:
#Returns a function for a 2D Gaussian model
def Gaussian_model2D(data,x_box,y_box,amplitude,x_stddev,y_stddev,theta,**residue):
if not residue:
x_mean, y_mean = max_pixel(data) # Returns location of maximum pixel value
else:
x_mean, y_mean = max_pixel(residue) # Returns location of maximum pixel value
g_init = models.Gaussian2D(amplitude,x_mean,y_mean,x_stddev,y_stddev,theta)
return g_init
# end of Gaussian_model2D
The function is called with the following command:
g2_init = Gaussian_model2D(cut_out,x_box,y_box,amp,x_stddev,y_stddev,theta,residue=residue1)
The version of Python that I am working in is 2.7.15
python python-2.7 dictionary kwargs numpy-ndarray
asked Nov 19 at 17:50
Crispyvb
31
2
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
2
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):
– Idlehands
Nov 19 at 17:55
1
dtypecannot bedict...
– juanpa.arrivillaga
Nov 19 at 17:58
Makeresiduean optional argument, something likedef foo(residue=None)then checkif residue is not None: ... do stuff with residue
– juanpa.arrivillaga
Nov 19 at 17:59
Usingresidue = Nonegives me the following error when compiling:ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
– Crispyvb
Nov 19 at 18:09
|
show 1 more comment
up vote
0
down vote
favorite
up vote
0
down vote
favorite
For a script that I am working on I want to make it optional to pass on an array to a function. The way in which I have attempted to do this is by making the variable in question (residue) a kwarg.
The problem is that when I do it in this way, python changes de dtype of the kwarg from a numpy.ndarray to dict. The simplest solution is to convert the variable back to a np.array using:
residue = np.array(residue.values())
But I do not find this a very elegant solution. So I was wondering if someone could show me a "prettier" way to accomplish this and possibly explain to my why python does this?
The function in question is:
#Returns a function for a 2D Gaussian model
def Gaussian_model2D(data,x_box,y_box,amplitude,x_stddev,y_stddev,theta,**residue):
if not residue:
x_mean, y_mean = max_pixel(data) # Returns location of maximum pixel value
else:
x_mean, y_mean = max_pixel(residue) # Returns location of maximum pixel value
g_init = models.Gaussian2D(amplitude,x_mean,y_mean,x_stddev,y_stddev,theta)
return g_init
# end of Gaussian_model2D
The function is called with the following command:
g2_init = Gaussian_model2D(cut_out,x_box,y_box,amp,x_stddev,y_stddev,theta,residue=residue1)
The version of Python that I am working in is 2.7.15
python python-2.7 dictionary kwargs numpy-ndarray
asked Nov 19 at 17:50
Crispyvb
31
For a script that I am working on I want to make it optional to pass on an array to a function. The way in which I have attempted to do this is by making the variable in question (residue) a kwarg.
The problem is that when I do it in this way, python changes de dtype of the kwarg from a numpy.ndarray to dict. The simplest solution is to convert the variable back to a np.array using:
residue = np.array(residue.values())
But I do not find this a very elegant solution. So I was wondering if someone could show me a "prettier" way to accomplish this and possibly explain to my why python does this?
The function in question is:
#Returns a function for a 2D Gaussian model
def Gaussian_model2D(data,x_box,y_box,amplitude,x_stddev,y_stddev,theta,**residue):
if not residue:
x_mean, y_mean = max_pixel(data) # Returns location of maximum pixel value
else:
x_mean, y_mean = max_pixel(residue) # Returns location of maximum pixel value
g_init = models.Gaussian2D(amplitude,x_mean,y_mean,x_stddev,y_stddev,theta)
return g_init
# end of Gaussian_model2D
The function is called with the following command:
g2_init = Gaussian_model2D(cut_out,x_box,y_box,amp,x_stddev,y_stddev,theta,residue=residue1)
The version of Python that I am working in is 2.7.15
python python-2.7 dictionary kwargs numpy-ndarray
python python-2.7 dictionary kwargs numpy-ndarray
asked Nov 19 at 17:50
Crispyvb
31
asked Nov 19 at 17:50
Crispyvb
31
asked Nov 19 at 17:50
Crispyvb
31
asked Nov 19 at 17:50
Crispyvb
31
asked Nov 19 at 17:50
Crispyvb
31
31
2
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
2
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):
– Idlehands
Nov 19 at 17:55
1
dtypecannot bedict...
– juanpa.arrivillaga
Nov 19 at 17:58
Makeresiduean optional argument, something likedef foo(residue=None)then checkif residue is not None: ... do stuff with residue
– juanpa.arrivillaga
Nov 19 at 17:59
Usingresidue = Nonegives me the following error when compiling:ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
– Crispyvb
Nov 19 at 18:09
|
show 1 more comment
2
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
2
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):
– Idlehands
Nov 19 at 17:55
1
dtypecannot bedict...
– juanpa.arrivillaga
Nov 19 at 17:58
Makeresiduean optional argument, something likedef foo(residue=None)then checkif residue is not None: ... do stuff with residue
– juanpa.arrivillaga
Nov 19 at 17:59
Usingresidue = Nonegives me the following error when compiling:ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
– Crispyvb
Nov 19 at 18:09
2
2
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
2
2
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):– Idlehands
Nov 19 at 17:55
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):– Idlehands
Nov 19 at 17:55
1
1
dtype cannot be dict...– juanpa.arrivillaga
Nov 19 at 17:58
dtype cannot be dict...– juanpa.arrivillaga
Nov 19 at 17:58
Make
residue an optional argument, something like def foo(residue=None) then check if residue is not None: ... do stuff with residue– juanpa.arrivillaga
Nov 19 at 17:59
Make
residue an optional argument, something like def foo(residue=None) then check if residue is not None: ... do stuff with residue– juanpa.arrivillaga
Nov 19 at 17:59
Using
residue = None gives me the following error when compiling: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()– Crispyvb
Nov 19 at 18:09
Using
residue = None gives me the following error when compiling: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()– Crispyvb
Nov 19 at 18:09
|
show 1 more comment
1 Answer
1
active
oldest
votes
up vote
0
down vote
accepted
See the accepted answer here why you always get a mapping-object (aka a dict) if you pass arguments via **kwargs; the language spec says:
If the form “**identifier” is present, it is initialized to a new
ordered mapping receiving any excess keyword arguments, defaulting to
a new empty mapping of the same type.
In other words, the behavior you described is exactly what the language guarantees.
One of the reasons for this behavior is that all functions, wrappers, and implementations in the underlying language (e.g. C / J) will understand that **kwargs is part of the arguments and should be expanded to its key-value combinations.
If you want to preserve your extra-arguments as an object of a certain type, you can't use **kwargs to do so; pass it via an explicit argument, e.g. extra_args which has no special meaning.
answered Nov 19 at 17:56
user2722968
2,64211637
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
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',
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%2f53380139%2fhow-do-i-keep-the-dtype-intact-of-a-kwarg%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
up vote
0
down vote
accepted
See the accepted answer here why you always get a mapping-object (aka a dict) if you pass arguments via **kwargs; the language spec says:
If the form “**identifier” is present, it is initialized to a new
ordered mapping receiving any excess keyword arguments, defaulting to
a new empty mapping of the same type.
In other words, the behavior you described is exactly what the language guarantees.
One of the reasons for this behavior is that all functions, wrappers, and implementations in the underlying language (e.g. C / J) will understand that **kwargs is part of the arguments and should be expanded to its key-value combinations.
If you want to preserve your extra-arguments as an object of a certain type, you can't use **kwargs to do so; pass it via an explicit argument, e.g. extra_args which has no special meaning.
answered Nov 19 at 17:56
user2722968
2,64211637
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
add a comment |
up vote
0
down vote
accepted
See the accepted answer here why you always get a mapping-object (aka a dict) if you pass arguments via **kwargs; the language spec says:
If the form “**identifier” is present, it is initialized to a new
ordered mapping receiving any excess keyword arguments, defaulting to
a new empty mapping of the same type.
In other words, the behavior you described is exactly what the language guarantees.
One of the reasons for this behavior is that all functions, wrappers, and implementations in the underlying language (e.g. C / J) will understand that **kwargs is part of the arguments and should be expanded to its key-value combinations.
If you want to preserve your extra-arguments as an object of a certain type, you can't use **kwargs to do so; pass it via an explicit argument, e.g. extra_args which has no special meaning.
answered Nov 19 at 17:56
user2722968
2,64211637
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
add a comment |
up vote
0
down vote
accepted
up vote
0
down vote
accepted
See the accepted answer here why you always get a mapping-object (aka a dict) if you pass arguments via **kwargs; the language spec says:
If the form “**identifier” is present, it is initialized to a new
ordered mapping receiving any excess keyword arguments, defaulting to
a new empty mapping of the same type.
In other words, the behavior you described is exactly what the language guarantees.
One of the reasons for this behavior is that all functions, wrappers, and implementations in the underlying language (e.g. C / J) will understand that **kwargs is part of the arguments and should be expanded to its key-value combinations.
If you want to preserve your extra-arguments as an object of a certain type, you can't use **kwargs to do so; pass it via an explicit argument, e.g. extra_args which has no special meaning.
answered Nov 19 at 17:56
user2722968
2,64211637
See the accepted answer here why you always get a mapping-object (aka a dict) if you pass arguments via **kwargs; the language spec says:
If the form “**identifier” is present, it is initialized to a new
ordered mapping receiving any excess keyword arguments, defaulting to
a new empty mapping of the same type.
In other words, the behavior you described is exactly what the language guarantees.
One of the reasons for this behavior is that all functions, wrappers, and implementations in the underlying language (e.g. C / J) will understand that **kwargs is part of the arguments and should be expanded to its key-value combinations.
If you want to preserve your extra-arguments as an object of a certain type, you can't use **kwargs to do so; pass it via an explicit argument, e.g. extra_args which has no special meaning.
answered Nov 19 at 17:56
user2722968
2,64211637
answered Nov 19 at 17:56
user2722968
2,64211637
answered Nov 19 at 17:56
user2722968
2,64211637
answered Nov 19 at 17:56
user2722968
2,64211637
2,64211637
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
add a comment |
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
I understand, thanks for the explanation!
– Crispyvb
Nov 20 at 11:02
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.
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.
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%2f53380139%2fhow-do-i-keep-the-dtype-intact-of-a-kwarg%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
2
That is not how optional arguments work.
– user2357112
Nov 19 at 17:54
2
def Gaussian_model2D(data, x_box, y_box, amplitude, x_stddev, y_stddev, theta, residue=None):– Idlehands
Nov 19 at 17:55
1
dtypecannot bedict...– juanpa.arrivillaga
Nov 19 at 17:58
Make
residuean optional argument, something likedef foo(residue=None)then checkif residue is not None: ... do stuff with residue– juanpa.arrivillaga
Nov 19 at 17:59
Using
residue = Nonegives me the following error when compiling:ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()– Crispyvb
Nov 19 at 18:09