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Diffstat (limited to 'README')
| -rw-r--r-- | README | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -61,6 +61,9 @@ the "What's New in Python 3.0" document, found at Please help write it! +If you want to install multiple versions of Python see the section below +entitled "Installing multiple versions". + What's New Since 3.0a1 ---------------------- @@ -83,6 +86,29 @@ code that needs to be changed, such as optional warnings when deprecated features are used, and backported versions of certain key Python 3000 features. + +Installing multiple versions +---------------------------- + +On Unix and Mac systems if you intend to install multiple versions of Python +using the same installation prefix (--prefix argument to the configure +script) you must take care that your primary python executable is not +overwritten by the installation of a different versio. All files and +directories installed using "make altinstall" contain the major and minor +version and can thus live side-by-side. "make install" also creates +${prefix}/bin/python which refers to ${prefix}/bin/pythonX.Y. If you intend +to install multiple versions using the same prefix you must decide which +version (if any) is your "primary" version. Install that version using +"make install". Install all other versions using "make altinstall". + +For example, if you want to install Python 2.5, 2.6 and 3.0 with 2.6 being +the primary version, you would execute "make install" in your 2.6 build +directory and "make altinstall" in the others. + + +Configuration options and variables +----------------------------------- + A source-to-source translation tool, "2to3", can take care of the mundane task of converting large amounts of source code. It is not a complete solution but is complemented by the deprecation warnings in |