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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.5 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.7 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 5.5 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 6 Extending0 码力 | 156 页 | 764.56 KB | 1 年前3Scrapy 0.9 Documentation
Scrapy shell Test your extraction code in an interactive environment. Item Loaders Populate your items with the extracted data. Item Pipeline Post-process and store your scraped data. Built-in services Debugging memory leaks Learn how to find and get rid of memory leaks in your crawler. Downloading Item Images Download static images associated with your scraped items. Extending Scrapy Architecture available signals and how to work with them. Exceptions See all available exceptions and their meaning. Item Exporters Quickly export your scraped items to a file (XML, CSV, etc). All the rest Contributing0 码力 | 204 页 | 447.68 KB | 1 年前3Scrapy 0.22 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.5 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.7 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 5.9 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 5.10 Ubuntu0 码力 | 199 页 | 926.97 KB | 1 年前3Scrapy 0.18 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.6 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 5.9 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 5.10 Ubuntu0 码力 | 201 页 | 929.55 KB | 1 年前3A Multithreaded, Transaction-Based Locking Strategy for Containers
variable • Atomic pointer • Atomic compare and exchange • Need a class that represents a lockable item (element) • Need a class that manages transactions on behalf of each thread • Transactions are represented Transaction ID using item_id_type = uint64_t; //- Item ID class transaction_manager; class lockable_item; class stopwatch;Copyright © 2020 Bob Steagall Class lockable_item 43 CppCon 2020 - A Multi-threaded Transaction-Based Locking Strategy for Containers Class Overview – lockable_item class lockable_item { public: lockable_item(); item_id_type id() const noexcept; tsv_type last_tsv() const noexcept; private:0 码力 | 142 页 | 474.78 KB | 5 月前3Scrapy 0.16 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.6 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 5.9 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 5.10 Ubuntu0 码力 | 203 页 | 931.99 KB | 1 年前3Scrapy 0.20 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.6 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 5.9 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5.10 Ubuntu0 码力 | 197 页 | 917.28 KB | 1 年前3Scrapy 0.12 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.6 Item Loaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.8 Item Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 5.5 Downloading Item Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 5.6 Ubuntu0 码力 | 177 页 | 806.90 KB | 1 年前3Scrapy 0.20 Documentation
Scrapy shell Test your extraction code in an interactive environment. Item Loaders Populate your items with the extracted data. Item Pipeline Post-process and store your scraped data. Feed exports Output Debugging memory leaks Learn how to find and get rid of memory leaks in your crawler. Downloading Item Images Download static images associated with your scraped items. Ubuntu packages Install latest available signals and how to work with them. Exceptions See all available exceptions and their meaning. Item Exporters Quickly export your scraped items to a file (XML, CSV, etc). All the rest Release notes0 码力 | 276 页 | 564.53 KB | 1 年前3Scrapy 0.12 Documentation
Scrapy shell Test your extraction code in an interactive environment. Item Loaders Populate your items with the extracted data. Item Pipeline Post-process and store your scraped data. Feed exports Output Debugging memory leaks Learn how to find and get rid of memory leaks in your crawler. Downloading Item Images Download static images associated with your scraped items. Ubuntu packages Install latest available signals and how to work with them. Exceptions See all available exceptions and their meaning. Item Exporters Quickly export your scraped items to a file (XML, CSV, etc). All the rest Contributing0 码力 | 228 页 | 462.54 KB | 1 年前3
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