How to test for type or instance of dict_values?

[Thorsten Kampe]

How can I test for type or instance of dictviews like dict_values?

`isinstance({}.values, dict_values)` gives
`NameError: name 'dict_values' is not defined`

"""

type({}.values())

<class 'dict_values'>
"""

Thorsten

[Peter Otten]

Post by Thorsten Kampe
How can I test for type or instance of dictviews like dict_values?

Why do you want to?

Post by Thorsten Kampe
`isinstance({}.values, dict_values)` gives
`NameError: name 'dict_values' is not defined`

You can "fix" this with

Post by Thorsten Kampe

dict_values = type({}.values())
isinstance({}.values(), collections.abc.ValuesView)

True

Post by Thorsten Kampe
"""

type({}.values())

<class 'dict_values'>
"""
Thorsten

[Thorsten Kampe]

* Peter Otten (Thu, 17 Nov 2016 13:38:26 +0100)

Post by Peter Otten

Post by Thorsten Kampe
How can I test for type or instance of dictviews like dict_values?

Why do you want to?

Thanks, for the `collections.abc.ValuesView` tip.

The code in question is part of an attempt to get the dimensions of
multi-dimensional lists, the `isinstance` is there in order to
exclude strings.

"""
def dim(seq):
dimension = []
while isinstance(seq, (list, tuple)):
dimension.append(len(seq))
try:
seq = seq[0]
except IndexError: # sequence is empty
break
return dimension
"""

Thorsten

[Terry Reedy]

Post by Thorsten Kampe
The code in question is part of an attempt to get the dimensions of
multi-dimensional lists, the `isinstance` is there in order to
exclude strings.

You can do the exclusion directly.

Post by Thorsten Kampe
"""
dimension = []

while not isinstance(seq, str) # or (str, bytes, ...)

Post by Thorsten Kampe
dimension.append(len(seq))
seq = seq[0]
except IndexError: # sequence is empty
break
return dimension
"""
Thorsten

[f***@gmail.com]

Very late to the party, but I just encountered a very similar problem and found a solution:

```
import collections

obj = {"foo": "bar"}
isinstance(obj.values(), collections.abc.ValuesView) # => True
```

Hope that helps someone out there :)

Post by Terry Reedy

Post by Thorsten Kampe
The code in question is part of an attempt to get the dimensions of
multi-dimensional lists, the `isinstance` is there in order to
exclude strings.

You can do the exclusion directly.

Post by Thorsten Kampe
"""
dimension = []

while not isinstance(seq, str) # or (str, bytes, ...)

Post by Thorsten Kampe
dimension.append(len(seq))
seq = seq[0]
except IndexError: # sequence is empty
break
return dimension
"""
Thorsten

--
Terry Jan Reedy