toolbox.py源代码分析
"""Miscellaneous utility functions
This program is part of "Dive Into Python", a free Python book for
experienced programmers. Visit http://diveintopython.org/ for the
latest version.
"""
__author__ = "Mark Pilgrim ([email protected])"
__version__ = "$Revision: 1.3 $"
__date__ = "$Date: 2004/05/05 21:57:20 $"
__copyright__ = "Copyright (c) 2001 Mark Pilgrim"
__license__ = "Python"
def openAnything(source):
"""URI, filename, or string --> stream
This function lets you define parsers that take any input source
(URL, pathname to local or network file, or actual data as a string)
and deal with it in a uniform manner. Returned object is guaranteed
to have all the basic stdio read methods (read, readline, readlines).
Just .close() the object when you're done with it.
Examples:
>>> from xml.dom import minidom
>>> sock = openAnything("http://localhost/kant.xml")
>>> doc = minidom.parse(sock)
>>> sock.close()
>>> sock = openAnything("c:\\inetpub\\wwwroot\\kant.xml")
>>> doc = minidom.parse(sock)
>>> sock.close()
>>> sock = openAnything("<ref id='conjunction'><text>and</text><text>or</text></ref>")
>>> doc = minidom.parse(sock)
>>> sock.close()
"""
if hasattr(source, "read"):
#The arguments are an object and a string. The result is True if the string is the name of #one of the object's attributes, False if not
#这个函数是检查read是否是source的一个属性
return source
if source == "-":
import sys
return sys.stdin
#若source是一个字符串“-”，则导入sys模块，并返回标准输入
# try to open with urllib (if source is http, ftp, or file URL)
import urllib
#导入urllib模块
try:
return urllib.urlopen(source)
#返回打开的url
#试着返回
except (IOError, OSError):
pass
# try to open with native open function (if source is pathname)
try:
return open(source)
except (IOError, OSError):
pass
# treat source as string
import StringIO
return StringIO.StringIO(str(source))