site — 不同平台的配置管理

Import Path

# site_import_path.py
import sys
import os
import site

if 'Windows' in sys.platform:
    SUFFIXES = [
        '',
        'lib/site-packages',
    ]
else:
    SUFFIXES = [
        'lib/python{}/site-packages'.format(sys.version[:3]),
        'lib/site-python',
    ]

print('Path prefixes:')
for p in site.PREFIXES:
    print('  ', p)

for prefix in sorted(set(site.PREFIXES)):
    print()
    print(prefix)
    for suffix in SUFFIXES:
        print()
        print(' ', suffix)
        path = os.path.join(prefix, suffix).rstrip(os.sep)
        print('   exists :', os.path.exists(path))
        print('   in path:', path in sys.path)

User Directories

# site_user_base.py
import site

print('Base:', site.USER_BASE)
print('Site:', site.USER_SITE)

# site_enable_user_site.py
import site

status = {
    None: 'Disabled for security',
    True: 'Enabled',
    False: 'Disabled by command-line option',
}

print('Flag   :', site.ENABLE_USER_SITE)
print('Meaning:', status[site.ENABLE_USER_SITE])

Path Configuration Files

# with_modules/mymodule.py
import os
print('Loaded {} from {}'.format(
    __name__, __file__[len(os.getcwd()) + 1:])
)

# site_addsitedir.py
import site
import os
import sys

script_directory = os.path.dirname(__file__)
module_directory = os.path.join(script_directory, sys.argv[1])

try:
    import mymodule
except ImportError as err:
    print('Could not import mymodule:', err)

print()
before_len = len(sys.path)
site.addsitedir(module_directory)
print('New paths:')
for p in sys.path[before_len:]:
    print(p.replace(os.getcwd(), '.'))  # shorten dirname

print()
import mymodule

Customizing Site Configuration

# with_sitecustomize/sitecustomize.py
print('Loading sitecustomize.py')

import site
import platform
import os
import sys

path = os.path.join('/opt',
                    'python',
                    sys.version[:3],
                    platform.platform(),
                    )
print('Adding new path', path)

site.addsitedir(path)

# with_sitecustomize/site_sitecustomize.py
import sys

print('Running main program from\n{}'.format(sys.argv[0]))

print('End of path:', sys.path[-1])

Customizing User Configuration

# with_usercustomize/usercustomize.py
print('Loading usercustomize.py')

import site
import platform
import os
import sys

path = os.path.expanduser(os.path.join('~',
                                       'python',
                                       sys.version[:3],
                                       platform.platform(),
                                       ))
print('Adding new path', path)

site.addsitedir(path)

# with_usercustomize/site_usercustomize.py
import sys

print('Running main program from\n{}'.format(sys.argv[0]))

print('End of path:', sys.path[-1])

Disabling the site Module