Pin Your Packages
In building your Python application and its dependencies for production, you want to make sure that your builds are predictable and deterministic. Therefore, always pin your dependencies. Update: A newer blog post about the future of pip-tools is available too: Better Package Management. Pin Explicitly ¶ Don’t ever use these styles in requirements.txt: lxml lxml>=2.2.0 lxml>=2.2.0,<2.3.0 Instead,
XPath and XSLT with lxml
XPath and XSLT with lxml lxml supports XPath 1.0, XSLT 1.0 and the EXSLT extensions through libxml2 and libxslt in a standards compliant way. lxml.etree supports the simple path syntax of the find, findall and findtext methods on ElementTree and Element, as known from the original ElementTree / xml.etree library (ElementPath). As an lxml specific extension, these classes also provide an xpath() me
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