Context

zavod.context.Context

The context is a utility object that is passed as an argument into crawlers and other runners.

It supports creating and emitting (storing) entities, accessing metadata and logging errors and warnings. It also has functions for fetching data from the web and storing it in the dataset's data folder.

cache: Cache property

A cache object for storing HTTP responses and other data.

data_time: datetime property writable

The data provenance time to be used for the emitted statements. This is used to set the first_seen and last_seen properties of statements to a time that may be different than the real run time of the crawler, e.g. when a coverage end is defined, or the data source itself states an update time.

Returns:

Type	Description
datetime	The time to be used for the emitted statements.

data_time_iso: str cached property

String representation of data_time in ISO format.

data_url: str property

The URL of the source data for the dataset.

lang: Optional[str] = None instance-attribute

Default language for statements emitted from this dataset

timestamps: TimeStampIndex property

An index of the first_seen time of every statement previous emitted by the dataset. This is used to determine if a statement is new or not.

audit_data(data, ignore=[])

Print the formatted data object if it contains any fields not explicitly excluded by the ignore list. This is used to warn about unexpected data in the source by removing the fields one by one and then inspecting the rest.

Parameters:

Name	Type	Description	Default
data	Dict[Any, Any]	A mapping which is to be checked.	required
ignore	List[Any]	List of string keys to be skipped when checking the mapping	[]

begin(clear=False)

Prepare the context for running the exporter.

Parameters:

Name	Type	Description	Default
clear	bool	Remove the existing resources and issues from the dataset.	False

clear_url(fingerprint)

Remove a given URL from the cache using request fingerprint Args: fingerprint: The unique fingerprint of the request. Returns: None

close()

Flush and tear down the context.

debug_lookups()

Output a list of unused lookup options.

emit(entity, target=False, external=False)

Send an entity from the crawling/runner process to be stored.

Parameters:

Name	Type	Description	Default
entity	Entity	The entity to be stored.	required
target	bool	Whether the entity is a target of the dataset.	False
external	bool	Whether the entity is an enrichment candidate or already part of the dataset.	False

export_resource(path, mime_type=None, title=None)

Register a file as a data resource exported by the dataset.

Parameters:

Name	Type	Description	Default
path	Path	The file path of the exported resource	required
mime_type	Optional[str]	MIME type of the resource, will be guessed otherwise	None
title	Optional[str]	A human-readable description.	None

Returns:

Type	Description
DataResource	The generated resource object which has been saved.

fetch_html(url, params=None, headers=None, auth=None, cache_days=None, method='GET', data=None)

Execute an HTTP request using the contexts' session and return an HTML DOM object based on the response. If a cache_days argument is provided, a cache will be used for the given number of days.

Parameters:

Name	Type	Description	Default
url	str	The URL to be fetched.	required
params	ParamsType	URL query parameters to be included in the URL.	None
headers	_Headers	HTTP request headers to be included.	None
auth	_Auth	HTTP basic authorization username and password to be included.	None
cache_days	Optional[int]	Number of days to retain cached responses for.	None
method	str	The HTTP method to use for the request.	'GET'
data	_Body	The data to be sent in the request body.	None

Returns: An lxml-based DOM of the web page that has been returned.

fetch_json(url, params=None, headers=None, auth=None, cache_days=None, method='GET', data=None)

Execute an HTTP request using the contexts' session and return a JSON-decoded object based on the response. If a cache_days argument is provided, a cache will be used for the given number of days.

Parameters:

Name	Type	Description	Default
url	str	The URL to be fetched.	required
params	ParamsType	URL query parameters to be included in the URL.	None
headers	_Headers	HTTP request headers to be included.	None
auth	_Auth	HTTP basic authorization username and password to be included.	None
cache_days	Optional[int]	Number of days to retain cached responses for.	None
method	str	The HTTP method to use for the request.	'GET'

Returns:

Type	Description
Any	The decoded response body as a JSON-decoded object.

fetch_resource(name, url, auth=None, headers=None)

Fetch a URL into a file located in the current run folder, if it does not exist.

fetch_response(url, headers=None, auth=None, method='GET', data=None)

Execute an HTTP request using the contexts' session.

Parameters:

Name	Type	Description	Default
url	str	The URL to be fetched.	required
headers	_Headers	HTTP request headers to be included.	None
auth	_Auth	HTTP basic authorization username and password to be included.	None
method	str	The HTTP method to use for the request.	'GET'
data	_Body	The data to be sent in the request body.	None

Returns: A response object.

fetch_text(url, params=None, headers=None, auth=None, cache_days=None, method='GET', data=None)

Execute an HTTP request using the contexts' session and return the decoded response body. If a cache_days argument is provided, a cache will be used for the given number of days.

Parameters:

Name	Type	Description	Default
url	str	The URL to be fetched.	required
params	ParamsType	URL query parameters to be included in the URL.	None
headers	_Headers	HTTP request headers to be included.	None
auth	_Auth	HTTP basic authorization username and password to be included.	None
cache_days	Optional[int]	Number of days to retain cached responses for. None to disable.	None
method	str	The HTTP method to use for the request.	'GET'
data	_Body	The data to be sent in the request body.	None

Returns:

Type	Description
Optional[str]	The decoded response body as a string.

get_resource_path(name)

Get the path to a file in the dataset data folder.

Parameters:

Name	Type	Description	Default
name	PathLike	The name of the file, relative to the dataset data folder.	required

Returns:

Type	Description
Path	The full path to the file.

inspect(obj)

Display an object in a form suitable for inspection.

Parameters:

Name	Type	Description	Default
obj	Any	The object to be logged in pretty print.	required

lookup_value(lookup, value, default=None)

Invoke a datapatch lookup defined in the dataset metadata.

Parameters:

Name	Type	Description	Default
lookup	str	The name of the lookup. The key under the dataset lookups property.	required
value	Optional[str]	The data value to look up.	required
default	Optional[str]	The default value to use if the lookup doesn't match the value.	None

make(schema)

Make a new entity with some dataset context set.

Parameters:

Name	Type	Description	Default
schema	Union[str, Schema]	The entity's type name	required

Returns:

Type	Description
Entity	A newly created entity object of the given type, with no ID.

make_id(*parts, prefix=None, hash_prefix=None)

Make a hash-based entity ID from a list of strings, prefixed with the dataset prefix.

Parameters:

Name	Type	Description	Default
prefix	Optional[str]	Use this prefix in the slug, but not the hash.	None
hash_prefix	Optional[str]	Use this prefix in the hash, but not the slug.	None

make_slug(*parts, strict=True, prefix=None)

Make a slug-based entity ID from a list of strings, using the dataset prefix.

parse_resource_xml(name)

Parse a file in the resource folder into an XML tree.

Parameters:

Name	Type	Description	Default
name	PathLike	The resource name or relative file path.	required

Returns:

Type	Description
_ElementTree	An lxml element tree of the parsed XML.

zavod.entity.Entity

Bases: CompositeEntity

Entity for sanctions list entries and adjacent objects.

Add utility methods to the EntityProxy for extracting data from sanctions lists and for auditing parsing errors to structured logging.

add_cast(schema, prop, values, cleaned=False, fuzzy=False, format=None, lang=None, original_value=None)

Set a property on an entity. If the entity is of a schema that doesn't have the given property, also modify the schema (e.g. if something has a birthDate, assume it's a Person, not a LegalEntity).

add_schema(schema)

Try to apply the given schema to the current entity, making it more specific (e.g. turning a LegalEntity into a Company). This raises an exception if the current and new type are incompatible.

unsafe_add(prop, value, cleaned=False, fuzzy=False, format=None, quiet=False, schema=None, dataset=None, seen=None, lang=None, original_value=None)

Add a statement to the entity, possibly the value.