【转载】Python常用模块之sys
也可以用sys.path.append(“mine module path”)来添加自定义的module。sys.builtin_module_names
sys.builtin_module_names返回一个列表，包含内建模块的名字。如：
>>> import sys
>>> print sys.builtin_module_names
('__builtin__', '__main__', '_ast', '_bisect', '_codecs', '_codecs_cn', '_codecs_hk', '_codecs_iso2022', '_codecs_jp', '_codecs_kr', '_codecs_tw', '_collections', '_csv', '_functools', '_heapq', '_hotshot', '_io', '_json', '_locale', '_lsprof', '_md5', '_multibytecodec', '_random', '_sha', '_sha256', '_sha512', '_sre', '_struct', '_subprocess', '_symtable', '_warnings', '_weakref', '_winreg', 'array', 'audioop', 'binascii', 'cPickle', 'cStringIO', 'cmath', 'datetime', 'errno', 'exceptions', 'future_builtins', 'gc', 'imageop', 'imp', 'itertools', 'marshal', 'math', 'mmap', 'msvcrt', 'nt', 'operator', 'parser', 'signal', 'strop', 'sys', 'thread', 'time', 'xxsubtype', 'zipimport', 'zlib')
代码示例：
# encoding: utf-8
# find_module.py
import sys
# print sys.builtin_module_names
def find_module(module):
if module in sys.builtin_module_names:
print module," => ","__builtin__"
else:
print module,"=> ",__import__(module).__file__
find_module('os')
find_module('sys')
find_module('strop')
find_module('zlib')
find_module('string')
# 运行结果：
>>>
======================== RESTART: E:/p/find_module.py ========================
os =>E:\Python27\lib\os.pyc
sys=>__builtin__
strop=>__builtin__
zlib=>__builtin__
string =>E:\Python27\lib\string.pyc
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