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# ``twisted`.`web`.`_template_util`.`_NSContext``

class documentation

`class _NSContext: (source)`

Constructor: `_NSContext(parent)`

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A mapping from XML namespaces onto their prefixes in the document.

Method | `__getitem__` | Proxy through to getting the prefix for the namespace.
Method | `__init__` | Pull out the parent's namespaces, if there's no parent then default to XML.
Method | `__setitem__` | Proxy through to setting the prefix for the namespace.
Method | `get` | Get a prefix for a namespace.
Instance Variable | `nss` | Undocumented
Instance Variable | `parent` | Undocumented

def __getitem__(self, k: `Optional[str]`) -> `Optional[str]`: (source)

Proxy through to getting the prefix for the namespace.

def __init__(self, parent: `Optional[_NSContext]` = None): (source)

Pull out the parent's namespaces, if there's no parent then default to XML.

def __setitem__(self, k: `Optional[str]`, v: `Optional[str]`): (source)

Proxy through to setting the prefix for the namespace.

def get(self, k: `Optional[str]`, d: `Optional[str]` = None) -> `Optional[str]`: (source)

Get a prefix for a namespace.

Parameters
k:`Optional[str]` | Undocumented
d:`Optional[str]` | The default prefix value.
Returns
`Optional[str]` | Undocumented

nss: `Dict[Optional[str], Optional[str]]` = (source)

Undocumented

parent = (source)

Undocumented