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One of the most frequently required features when implementing scrapers isbeing able to store the scraped data properly and, quite often, that meansgenerating an “export file” with the scraped data (commonly called “exportfeed”) to be consumed by other systems.
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Scrapy provides this functionality out of the box with the Feed Exports, whichallows you to generate feeds with the scraped items, using multipleserialization formats and storage backends.
Serialization formats¶
For serializing the scraped data, the feed exports use the . These formats are supported out of the box:
But you can also extend the supported format through the setting.
JSON¶
- Value for the
format
key in the setting:json
- Exporter used:
JsonItemExporter
- See if you’re using JSON withlarge feeds.
JSON lines¶
- Value for the
format
key in the setting:jsonlines
- Exporter used:
JsonLinesItemExporter
CSV¶
- Value for the
format
key in the setting:csv
- Exporter used:
CsvItemExporter
- To specify columns to export and their order use. Other feed exporters can also use thisoption, but it is important for CSV because unlike many other exportformats CSV uses a fixed header.
XML¶
- Value for the
format
key in the setting:xml
- Exporter used:
XmlItemExporter
Pickle¶
- Value for the
format
key in the setting:pickle
- Exporter used:
PickleItemExporter
Marshal¶
- Value for the
format
key in the setting:marshal
- Exporter used:
MarshalItemExporter
Storages¶
When using the feed exports you define where to store the feed using one or multiple URIs(through the setting). The feed exports supports multiplestorage backend types which are defined by the URI scheme.
The storages backends supported out of the box are:
- (requires botocore)
- (requires google-cloud-storage)
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Some storage backends may be unavailable if the required external libraries arenot available. For example, the S3 backend is only available if the botocorelibrary is installed.
Storage URI parameters¶
The storage URI can also contain parameters that get replaced when the feed isbeing created. These parameters are:
%(time)s
- gets replaced by a timestamp when the feed is being created%(name)s
- gets replaced by the spider name
Any other named parameter gets replaced by the spider attribute of the samename. For example,
%(site_id)s
would get replaced by the spider.site_id
attribute the moment the feed is being created.Here are some examples to illustrate:
- Store in FTP using one directory per spider:
ftp://user:[email protected]/scraping/feeds/%(name)s/%(time)s.json
- Store in S3 using one directory per spider:
s3://mybucket/scraping/feeds/%(name)s/%(time)s.json
Storage backends¶
Local filesystem¶
The feeds are stored in the local filesystem.
- URI scheme:
file
- Example URI:
file:///tmp/export.csv
- Required external libraries: none
Note that for the local filesystem storage (only) you can omit the scheme ifyou specify an absolute path like
/tmp/export.csv
. This only works on Unixsystems though.FTP¶
The feeds are stored in a FTP server.
- URI scheme:
ftp
- Example URI:
ftp://user:[email protected]/path/to/export.csv
- Required external libraries: none
FTP supports two different connection modes: active or passive. Scrapy uses the passive connectionmode by default. To use the active connection mode instead, set the setting to
True
.This storage backend uses .
S3¶
The feeds are stored on Amazon S3.
- URI scheme:
s3
- Example URIs:
s3://mybucket/path/to/export.csv
s3://aws_key:aws_secret@mybucket/path/to/export.csv
- Required external libraries: botocore >= 1.4.87
The AWS credentials can be passed as user/password in the URI, or they can bepassed through the following settings:
You can also define a custom ACL for exported feeds using this setting:
This storage backend uses .
Google Cloud Storage (GCS)¶
The feeds are stored on Google Cloud Storage.
- URI scheme:
gs
- Example URIs:
gs://mybucket/path/to/export.csv
- Required external libraries: google-cloud-storage.
For more information about authentication, please refer to Google Cloud documentation.
You can set a Project ID and Access Control List (ACL) through the following settings:
This storage backend uses .
Standard output¶
The feeds are written to the standard output of the Scrapy process.
- URI scheme:
stdout
- Example URI:
stdout:
- Required external libraries: none
Delayed file delivery¶
As indicated above, some of the described storage backends use delayed filedelivery.
These storage backends do not upload items to the feed URI as those items arescraped. Instead, Scrapy writes items into a temporary local file, and onlyonce all the file contents have been written (i.e. at the end of the crawl) isthat file uploaded to the feed URI.
If you want item delivery to start earlier when using one of these storagebackends, use to split the output itemsin multiple files, with the specified maximum item count per file. That way, assoon as a file reaches the maximum item count, that file is delivered to thefeed URI, allowing item delivery to start way before the end of the crawl.
Settings¶
These are the settings used for configuring the feed exports:
- (mandatory)
FEEDS¶
New in version 2.1.
Default:
{}
A dictionary in which every key is a feed URI (or a
pathlib.Path
object) and each value is a nested dictionary containing configurationparameters for the specific feed.This setting is required for enabling the feed export feature.
See for supported URI schemes.
For instance:
Deskcover 1 2 1. The following is a list of the accepted keys and the setting that is usedas a fallback value if that key is not provided for a specific feed definition:
format
: the .This setting is mandatory, there is no fallback value.batch_item_count
: falls back to.New in version 2.3.0.encoding
: falls back to .fields
: falls back to .indent
: falls back to .item_export_kwargs
:dict
with keyword arguments for the corresponding .overwrite
: whether to overwrite the file if it already exists(True
) or append to its content (False
).The default value depends on the :- :
False
- :
True
NoteSome FTP servers may not support appending to files (theAPPE
FTP command). - :
True
(appending is not supported) - :
False
(overwriting is not supported)
store_empty
: falls back to .uri_params
: falls back to .
FEED_EXPORT_ENCODING¶
Default:
None
The encoding to be used for the feed.
If unset or set to
None
(default) it uses UTF-8 for everything except JSON output,which uses safe numeric encoding (uXXXX
sequences) for historic reasons.Use
utf-8
if you want UTF-8 for JSON too.FEED_EXPORT_FIELDS¶
Default:
None
A list of fields to export, optional.Example:
FEED_EXPORT_FIELDS=['foo','bar','baz']
.Use FEED_EXPORT_FIELDS option to define fields to export and their order.
When FEED_EXPORT_FIELDS is empty or None (default), Scrapy uses the fieldsdefined in yielded by your spider.
If an exporter requires a fixed set of fields (this is the case for export format) and FEED_EXPORT_FIELDSis empty or None, then Scrapy tries to infer field names from theexported data - currently it uses field names from the first item.
FEED_EXPORT_INDENT¶
Default:
0
Amount of spaces used to indent the output on each level. If
FEED_EXPORT_INDENT
is a non-negative integer, then array elements and object members will be pretty-printedwith that indent level. An indent level of 0
(the default), or negative,will put each item on a new line. None
selects the most compact representation.Currently implemented only by
JsonItemExporter
and XmlItemExporter
, i.e. when you are exportingto .json
or .xml
.FEED_STORE_EMPTY¶
Default:
False
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Whether to export empty feeds (i.e. feeds with no items).
FEED_STORAGES¶
Default:
{}
A dict containing additional feed storage backends supported by your project.The keys are URI schemes and the values are paths to storage classes.
FEED_STORAGE_FTP_ACTIVE¶
Default:
False
Whether to use the active connection mode when exporting feeds to an FTP server(
True
) or use the passive connection mode instead (False
, default).For information about FTP connection modes, see What is the difference betweenactive and passive FTP?.
FEED_STORAGE_S3_ACL¶
Default:
'
(empty string)A string containing a custom ACL for feeds exported to Amazon S3 by your project.
For a complete list of available values, access the Canned ACL section on Amazon S3 docs.
FEED_STORAGES_BASE¶
Default:
A dict containing the built-in feed storage backends supported by Scrapy. Youcan disable any of these backends by assigning
None
to their URI scheme in. E.g., to disable the built-in FTP storage backend(without replacement), place this in your settings.py
:FEED_EXPORTERS¶
Default:
{}
A dict containing additional exporters supported by your project. The keys areserialization formats and the values are paths to classes.
FEED_EXPORTERS_BASE¶
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Default:
A dict containing the built-in feed exporters supported by Scrapy. You candisable any of these exporters by assigning
None
to their serializationformat in . E.g., to disable the built-in CSV exporter(without replacement), place this in your settings.py
:FEED_EXPORT_BATCH_ITEM_COUNT¶
New in version 2.3.0.
Default:
0
If assigned an integer number higher than
0
, Scrapy generates multiple output filesstoring up to the specified number of items in each output file.When generating multiple output files, you must use at least one of the followingplaceholders in the feed URI to indicate how the different output file names aregenerated:
%(batch_time)s
- gets replaced by a timestamp when the feed is being created(e.g.2020-03-28T14-45-08.237134
)%(batch_id)d
- gets replaced by the 1-based sequence number of the batch.Use printf-style string formatting toalter the number format. For example, to make the batch ID a 5-digitnumber by introducing leading zeroes as needed, use%(batch_id)05d
(e.g.3
becomes00003
,123
becomes00123
).
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For instance, if your settings include:
And your command line is:
The command line above can generate a directory tree like:
Where the first and second files contain exactly 100 items. The last one contains100 items or fewer.
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FEED_URI_PARAMS¶
Default:
None
A string with the import path of a function to set the parameters to apply withprintf-style string formatting to thefeed URI.
The function signature should be as follows:
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Return a
dict
of key-value pairs to apply to the feed URI usingprintf-style string formatting.- params (dict) –default key-value pairsSpecifically:
batch_id
: ID of the file batch. See.If is0
,batch_id
is always1
.New in version 2.3.0.batch_time
: UTC date and time, in ISO format with:
replaced with-
.See .time
:batch_time
, with microseconds set to0
.
- spider (scrapy.spiders.Spider) – source spider of the feed items
For example, to include the
name
of thesource spider in the feed URI:- Define the following function somewhere in your project:
- Point to that function in your settings:
- Use
%(spider_name)s
in your feed URI:
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