diff options
| -rw-r--r-- | gnu/packages/aux-files/python/sitecustomize.py | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/gnu/packages/aux-files/python/sitecustomize.py b/gnu/packages/aux-files/python/sitecustomize.py index 65d3c7d554..71e328b9ac 100644 --- a/gnu/packages/aux-files/python/sitecustomize.py +++ b/gnu/packages/aux-files/python/sitecustomize.py @@ -20,13 +20,26 @@ import os import sys -python_root = os.path.realpath(sys.executable).split('/bin/')[0] -major_minor = '{}.{}'.format(sys.version_info[0], sys.version_info[1]) -site_packages_prefix = 'lib/python' + major_minor + '/site-packages' -python_site = python_root + '/' + site_packages_prefix +# Commentary: +# +# Site-specific customization for Guix. +# +# The program below honors the GUIX_PYTHONPATH environment variable to +# discover Python packages. File names appearing in this variable that match +# a predefined versioned installation prefix are added to the sys.path. To be +# considered, a Python package must be installed under the +# 'lib/pythonX.Y/site-packages' directory, where X and Y are the major and +# minor version numbers of the Python interpreter. +# +# Code: + +major_minor = '{}.{}'.format(*sys.version_info) +site_packages_prefix = os.path.join( + 'lib', 'python' + major_minor, 'site-packages') +python_site = os.path.join(sys.prefix, site_packages_prefix) try: - all_sites_raw = os.environ['GUIX_PYTHONPATH'].split(':') + all_sites_raw = os.environ['GUIX_PYTHONPATH'].split(os.path.pathsep) except KeyError: all_sites_raw = [] # Normalize paths, otherwise a trailing slash would cause it to not match. @@ -35,7 +48,8 @@ matching_sites = [p for p in all_sites_norm if p.endswith(site_packages_prefix)] # Insert sites matching the current version into sys.path, right before -# Python's own site. +# Python's own site. This way, the user can override the libraries provided +# by Python itself. sys_path_absolute = [os.path.realpath(p) for p in sys.path] index = sys_path_absolute.index(python_site) -sys.path = sys.path[:index] + matching_sites + sys.path[index:] +sys.path[index:index] = matching_sites |