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Function annotation with two or more return parameters
What does ** (double star/asterisk) and * (star/asterisk) do for parameters?How to merge two dictionaries in a single expression?How to flush output of print function?How to return multiple values from a function?Using global variables in a functionLimiting floats to two decimal pointsHow to make a chain of function decorators?How do I concatenate two lists in Python?Why didn't PEP 3107 (or 484) include syntax for annotating global/local variables?function annotations in python
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When I write an annotation for a function which returns one parameter, I have no problems.
def func() -> str:
return "ok"
However, when I write an annotation with two or more parameters, my PyCharm gives me SyntaxError: invalid syntax.
def func() -> str, str:
return "ok - 1", "ok - 2"
I think that the parameters can be combined with a tuple, but I don't think that's the best way to do it.
My question is: how can I properly annotate a function with two or more return parameters?
Please include a PEP link, if any, in your response. I looked for the answer at PEP 484 and PEP 3107 and could not find it.
python python-3.x type-hinting
edited May 7 at 2:47
gmds
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
add a comment |
When I write an annotation for a function which returns one parameter, I have no problems.
def func() -> str:
return "ok"
However, when I write an annotation with two or more parameters, my PyCharm gives me SyntaxError: invalid syntax.
def func() -> str, str:
return "ok - 1", "ok - 2"
I think that the parameters can be combined with a tuple, but I don't think that's the best way to do it.
My question is: how can I properly annotate a function with two or more return parameters?
Please include a PEP link, if any, in your response. I looked for the answer at PEP 484 and PEP 3107 and could not find it.
python python-3.x type-hinting
edited May 7 at 2:47
gmds
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
It should be noted that the secondfuncis equivalent totmp = ('ok - 1', 'ok - 2')return tmp, making it immediately apparent why it requires Tuple.
– Peilonrayz
May 7 at 9:01
add a comment |
When I write an annotation for a function which returns one parameter, I have no problems.
def func() -> str:
return "ok"
However, when I write an annotation with two or more parameters, my PyCharm gives me SyntaxError: invalid syntax.
def func() -> str, str:
return "ok - 1", "ok - 2"
I think that the parameters can be combined with a tuple, but I don't think that's the best way to do it.
My question is: how can I properly annotate a function with two or more return parameters?
Please include a PEP link, if any, in your response. I looked for the answer at PEP 484 and PEP 3107 and could not find it.
python python-3.x type-hinting
edited May 7 at 2:47
gmds
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
When I write an annotation for a function which returns one parameter, I have no problems.
def func() -> str:
return "ok"
However, when I write an annotation with two or more parameters, my PyCharm gives me SyntaxError: invalid syntax.
def func() -> str, str:
return "ok - 1", "ok - 2"
I think that the parameters can be combined with a tuple, but I don't think that's the best way to do it.
My question is: how can I properly annotate a function with two or more return parameters?
Please include a PEP link, if any, in your response. I looked for the answer at PEP 484 and PEP 3107 and could not find it.
python python-3.x type-hinting
python python-3.x type-hinting
edited May 7 at 2:47
gmds
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
edited May 7 at 2:47
gmds
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
edited May 7 at 2:47
gmds
10.9k11038
edited May 7 at 2:47
gmds
10.9k11038
edited May 7 at 2:47
gmds
10.9k11038
10.9k11038
asked May 7 at 2:05
KirillKirill
1809
asked May 7 at 2:05
KirillKirill
1809
asked May 7 at 2:05
KirillKirill
1809
1809
It should be noted that the secondfuncis equivalent totmp = ('ok - 1', 'ok - 2')return tmp, making it immediately apparent why it requires Tuple.
– Peilonrayz
May 7 at 9:01
add a comment |
It should be noted that the secondfuncis equivalent totmp = ('ok - 1', 'ok - 2')return tmp, making it immediately apparent why it requires Tuple.
– Peilonrayz
May 7 at 9:01
It should be noted that the second
func is equivalent to tmp = ('ok - 1', 'ok - 2') return tmp, making it immediately apparent why it requires Tuple.– Peilonrayz
May 7 at 9:01
It should be noted that the second
func is equivalent to tmp = ('ok - 1', 'ok - 2') return tmp, making it immediately apparent why it requires Tuple.– Peilonrayz
May 7 at 9:01
add a comment |
1 Answer
1
active
oldest
votes
Use typing.Tuple:
from typing import Tuple
def func() -> Tuple[str, str]:
return 'a', 'b'
This is appropriate because, conceptually, you are actually returning a single tuple containing those values. Note:
print(type(func()))
Output:
<class 'tuple'>
Note that except for the empty tuple (()), parentheses are not necessary to define a tuple, which means that 'a', 'b' is created as a tuple, rather than being separate values gathered into one by the return statement.
answered May 7 at 2:07
gmdsgmds
10.9k11038
1
Tupleis reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.
– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically returntuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?
– gmds
May 7 at 2:57
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
|
show 2 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use typing.Tuple:
from typing import Tuple
def func() -> Tuple[str, str]:
return 'a', 'b'
This is appropriate because, conceptually, you are actually returning a single tuple containing those values. Note:
print(type(func()))
Output:
<class 'tuple'>
Note that except for the empty tuple (()), parentheses are not necessary to define a tuple, which means that 'a', 'b' is created as a tuple, rather than being separate values gathered into one by the return statement.
answered May 7 at 2:07
gmdsgmds
10.9k11038
1
Tupleis reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.
– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically returntuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?
– gmds
May 7 at 2:57
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
|
show 2 more comments
Use typing.Tuple:
from typing import Tuple
def func() -> Tuple[str, str]:
return 'a', 'b'
This is appropriate because, conceptually, you are actually returning a single tuple containing those values. Note:
print(type(func()))
Output:
<class 'tuple'>
Note that except for the empty tuple (()), parentheses are not necessary to define a tuple, which means that 'a', 'b' is created as a tuple, rather than being separate values gathered into one by the return statement.
answered May 7 at 2:07
gmdsgmds
10.9k11038
1
Tupleis reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.
– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically returntuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?
– gmds
May 7 at 2:57
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
|
show 2 more comments
Use typing.Tuple:
from typing import Tuple
def func() -> Tuple[str, str]:
return 'a', 'b'
This is appropriate because, conceptually, you are actually returning a single tuple containing those values. Note:
print(type(func()))
Output:
<class 'tuple'>
Note that except for the empty tuple (()), parentheses are not necessary to define a tuple, which means that 'a', 'b' is created as a tuple, rather than being separate values gathered into one by the return statement.
answered May 7 at 2:07
gmdsgmds
10.9k11038
Use typing.Tuple:
from typing import Tuple
def func() -> Tuple[str, str]:
return 'a', 'b'
This is appropriate because, conceptually, you are actually returning a single tuple containing those values. Note:
print(type(func()))
Output:
<class 'tuple'>
Note that except for the empty tuple (()), parentheses are not necessary to define a tuple, which means that 'a', 'b' is created as a tuple, rather than being separate values gathered into one by the return statement.
answered May 7 at 2:07
gmdsgmds
10.9k11038
edited 2 hours ago
answered May 7 at 2:07
gmdsgmds
10.9k11038
answered May 7 at 2:07
gmdsgmds
10.9k11038
answered May 7 at 2:07
gmdsgmds
10.9k11038
10.9k11038
1
Tupleis reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.
– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically returntuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?
– gmds
May 7 at 2:57
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
|
show 2 more comments
1
Tupleis reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.
– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically returntuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?
– gmds
May 7 at 2:57
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
1
1
Tuple is reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.– kojiro
May 7 at 2:48
Tuple is reasonable. It may be too strict in some cases, but there isn’t a better alternative without different tradeoffs as far as I can tell.– kojiro
May 7 at 2:48
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
@kojiro It seems to me that that would not apply in the case of return values...?
– gmds
May 7 at 2:50
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
I think it still applies. The main thing about the signature isn’t that the function returns a tuple per se, but that it return an unpackable with a specific length. There are plenty of sequence types that are unpackable, but no generic unpackable type that also has length and inner-type specifiers. Tuple can specify everything, but is too strict.
– kojiro
May 7 at 2:54
4
4
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically return
tuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?– gmds
May 7 at 2:57
@kojiro I might be misunderstanding you, but is it not the case that functions with multiple return values specifically return
tuple, as opposed to a function with a single return value that also happens to be an unpackable object that knows its length and elements' types, which would require such a specifier?– gmds
May 7 at 2:57
1
1
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
A tuple is still a single object that happens to be unpackable. That’s what I’m saying. There isn’t a way to express python returning multiple values from a function because python can’t return multiple values from a function. But it can return a sequence, and a tuple is one kind of sequence.
– kojiro
May 7 at 3:05
|
show 2 more comments
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It should be noted that the second
funcis equivalent totmp = ('ok - 1', 'ok - 2')return tmp, making it immediately apparent why it requires Tuple.– Peilonrayz
May 7 at 9:01