Path to Python

"path to Python "

1.PYTHONHOME

The location of the libraries Python. By default, the libraries is searched in prefix/lib/pythonversion exec_prefix/lib/pythonversion and, where and is prefix exec_prefix installation-dependent directories, b Oth defaulting to /usr/local .

Pythonhome is the path to the Python library.

When PYTHONHOME was set to a single directory, its value replaces both prefix and exec_prefix . To specify different values for these, set to PYTHONHOME prefix:exec_prefix .

When prefix, Exec_rpefix are inconsistent, pythonhome is set to Prefix:exec_prefix.

2.PYTHONPATH

Augment the default search path for module files. The format is the same as the Shell's PATH : one or more directory pathnames separated by os.pathsep (e.g. colons on Unix o R semicolons on Windows). Non-existent directories is silently ignored.

The default search path for module.

In addition to normal directories, individual PYTHONPATH entries could refer to zipfiles containing pure Python modules (in E Ither source or compiled form). Extension modules cannot is imported from Zipfiles.

It is possible to add a zip file.

The default search path is installation dependent and generally begins with prefix/lib/pythonversion (see PYTHONHOME above). It's always appended to PYTHONPATH .

/lib/pythonversion was added on the basis of pythomhome.

3. Site

　　This module is automatically imported during initialization. The automatic import can be suppressed using the interpreter ' s -S option.

Importing this module would append site-specific paths to the module search path and add a few builtins, unless is -S u Sed.

Site module will be loaded automatically, site will add site-specific path into module search path. Even if-S is specified.

It starts by constructing up to four directories from a head and a tail part. For the head part, it uses sys.prefix and Sys.exec_prefix ; Empty heads is skipped. For the tail part, it uses the empty string and then lib/site-packages OWS) or lib/python x.y Span class= "Pre" >/site-packages (on Unix and Macintosh). For each of the distinct head-tail combinations, it sees if it refers to a existing directory, and if so, adds it to sys.path and also inspects the newly added path for configuration files.

A path configuration file is a file whose name have the form and exists in one of the four name.pth directories mentioned Abov E Its contents is additional items (one per line) to being added to sys.path . Non-existing items is never added to sys.path . No item is added to more sys.path than once. Blank lines and lines beginning with is # skipped. Lines starting with import (followed by space or tab) is executed.

The. PTH is a path file.

4, after these path manipulations, an attempt are made to import a module named sitecustomize , which can perform arbitrary site-spec Ific customizations. It is typically created by a system administrator in the Site-packages directory.

5, after this, an attempt are made to import a module named usercustomize , which can perform arbitrary user-specific customizations, If is ENABLE_USER_SITE true. This file was intended to being created in the user site-packages directory (see below), which was part of sys.path unless disable D by -s .

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Path to Python