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How do I create a Python namespace (argparse.parse_args value)?

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Table of Contents

How do I create a Python namespace (argparse.parse_args value)?

  1. How do I create a Python namespace (argparse.parse_args value)?

    It is now recommended to use SimpleNamespace from the types module. It does the same thing as the accepted answer except for it will be faster and have a few more builtins such as equals and repr.

  2. create a Python namespace (argparse.parse_args value)

    It is now recommended to use SimpleNamespace from the types module. It does the same thing as the accepted answer except for it will be faster and have a few more builtins such as equals and repr.

Method 1

You can create a simple class:

class Namespace:
    def __init__(self, **kwargs):
        self.__dict__.update(kwargs)

and it’ll work the exact same way as the argparse Namespace class when it comes to attributes:

>>> args = Namespace(a=1, b='c')
>>> args.a
1
>>> args.b
'c'

Alternatively, just import the class; it is available from the argparse module:

from argparse import Namespace

args = Namespace(a=1, b='c')

As of Python 3.3, there is also types.SimpleNamespace, which essentially does the same thing:

>>> from types import SimpleNamespace
>>> args = SimpleNamespace(a=1, b='c')
>>> args.a
1
>>> args.b
'c'

The two types are distinct; SimpleNamespace is primarily used for the sys.implementation attribute and the return value of time.get_clock_info().

Further comparisons:

  • Both classes support equality testing; for two instances of the same class, instance_a == instance_b is true if they have the same attributes with the same values.
  • Both classes have a helpful __repr__ to show what attributes they have.
  • Namespace() objects support containment testing; 'attrname' in instance is true if the namespace instance has an attribute namend attrnameSimpleNamespace does not.
  • Namespace() objects have an undocumented ._get_kwargs() method that returns a sorted list of (name, value) attributes for that instance. You can get the same for either class using sorted(vars(instance).items()).
  • While SimpleNamespace() is implemented in C and Namespace() is implemented in Python, attribute access is no faster because both use the same __dict__ storage for the attributes. Equality testing and producing the representation are a little faster for SimpleNamespace() instances.

Method 2

It is now recommended to use SimpleNamespace from the types module. It does the same thing as the accepted answer except for it will be faster and have a few more builtins such as equals and repr.

from types import SimpleNamespace

sn = SimpleNamespace()
sn.a = 'test'
sn.a

# output
'test'

Conclusion

It’s all About this issue. Hope all Methods helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which Method worked for you? Thank You.

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