Python Paste helps Python web development and web application installation by providing tools for both developers and system administrators. Among other things, Python Paste includes a variety of middleware components to develop, test, configure, and run WSGI applications.
virtualenv is a tool to create isolated Python environments. A virtual environment has its own Python libraries, and can have different versions of libraries from other environments. Using this, you can avoid version conflicts for different applications.
FormEncode is a validation and form generation package. The validation can be used separately from the form generation. The validation works on compound data structures, with all parts being nestable. It is separate from HTTP or any other input mechanism.
WebOb is a Python HTTP request and response object, based on WSGI. It is a thorough mapping of HTTP.
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