Python scripts

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Python scripts

• Dragos Chirila
• Finsiel Romania

Copenhagen, 25 May 2004
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Python overview

• it is an interpreted OO programming language
• it has modules, classes, exceptions, very high
  level dynamic data types, and dynamic typing
• it is portable it runs on many brands of UNIX,
  on Windows, OS/2, Mac and many other platforms
• rich set of modules and packages
• most of Zope is written in Python
• many resources available at http//www.python.org

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Zope scripting (I)

• Zope manages presentation, logic and data with
  objects
• data Files, Images
• presentation DTML and Page Templates
• logic DMTL and scripts (Python and Perl)
• Scripts objects that encapsulate chunk of code
  written in a programming language
• Zope comes with Python Scripts, External Methods
• Perl Scripts separated

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Zope scripting (II)

• A script is treated like a method of an object
• Context the environment in which the script
  executes
• Scripts can be called
• from the web, by visiting an URL
• from any other type of object

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When to use them

• Python scripts vs. DTML/ZPT
• Complicate computations
• Keep presentation apart from logic
• Cleaner code
• When the task becomes complex think about moving
  to External Methods or Python products
• The only strong point of Python Scripts is the
  fast access to them - from ZMI

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Python Scripts product

• The Python Scripts product provides support for
  execution of Python scripts, exposing them as
  callable objects within the Zope
• In order to create a Python script, from Select
  type to add select Script (Python) and fill
• Id
• Title
• Parameter list
• Bound Names

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Binding variables (I)

• Bound names set of variables that are created
  whenever the script is called
• used to access other Zope objects and scripts and
  are only available in Python scripts
• the names of the variables are set by default and
  should not be changed

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Binding variables (II)

• Context refers to the object (environment) in
  which the script is called - context
• Container refers to the object (environment) in
  which the script is called container
• Script refers to the object itself script
• Namespace is left blank by default
• Subpath an advanced variable used when the
  script is traversed - traverse_subpath

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Edit and test a script

• edit the content of the script object like
  bellow
• parameters list nameAnonymous
• body return Hello s! name
• test the script using the Test tab from ZMI