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py3: conditionalize the raise statement...
py3: conditionalize the raise statement raise E,V,T is not acceptable in Python 3, thats is conditionalized. Moreover this will result in syntax error so we have to use exec() to execute this. Related PEP- https://www.python.org/dev/peps/pep-3109/#id14 My implementation is motivated from the six implementation except they are defining a new function exec_() to prevent adding an extra frame AFAIK :) https://bitbucket.org/gutworth/six/src/ca4580a5a648/six.py#six.py-680

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pycompat.py
153 lines | 3.5 KiB | text/x-python | PythonLexer
# pycompat.py - portability shim for python 3
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Mercurial portability shim for python 3.
This contains aliases to hide python version-specific details from the core.
"""
from __future__ import absolute_import
import sys
if sys.version_info[0] < 3:
import cPickle as pickle
import cStringIO as io
import httplib
import Queue as _queue
import SocketServer as socketserver
import urlparse
import xmlrpclib
else:
import http.client as httplib
import io
import pickle
import queue as _queue
import socketserver
import urllib.parse as urlparse
import xmlrpc.client as xmlrpclib
stringio = io.StringIO
empty = _queue.Empty
queue = _queue.Queue
class _pycompatstub(object):
pass
def _alias(alias, origin, items):
""" populate a _pycompatstub
copies items from origin to alias
"""
def hgcase(item):
return item.replace('_', '').lower()
for item in items:
try:
setattr(alias, hgcase(item), getattr(origin, item))
except AttributeError:
pass
httpserver = _pycompatstub()
urlreq = _pycompatstub()
urlerr = _pycompatstub()
try:
import BaseHTTPServer
import CGIHTTPServer
import SimpleHTTPServer
import urllib2
import urllib
_alias(urlreq, urllib, (
"addclosehook",
"addinfourl",
"ftpwrapper",
"pathname2url",
"quote",
"splitattr",
"splitpasswd",
"splitport",
"splituser",
"unquote",
"url2pathname",
"urlencode",
"urlencode",
))
_alias(urlreq, urllib2, (
"AbstractHTTPHandler",
"BaseHandler",
"build_opener",
"FileHandler",
"FTPHandler",
"HTTPBasicAuthHandler",
"HTTPDigestAuthHandler",
"HTTPHandler",
"HTTPPasswordMgrWithDefaultRealm",
"HTTPSHandler",
"install_opener",
"ProxyHandler",
"Request",
"urlopen",
))
_alias(urlerr, urllib2, (
"HTTPError",
"URLError",
))
_alias(httpserver, BaseHTTPServer, (
"HTTPServer",
"BaseHTTPRequestHandler",
))
_alias(httpserver, SimpleHTTPServer, (
"SimpleHTTPRequestHandler",
))
_alias(httpserver, CGIHTTPServer, (
"CGIHTTPRequestHandler",
))
except ImportError:
import urllib.request
_alias(urlreq, urllib.request, (
"AbstractHTTPHandler",
"addclosehook",
"addinfourl",
"BaseHandler",
"build_opener",
"FileHandler",
"FTPHandler",
"ftpwrapper",
"HTTPHandler",
"HTTPSHandler",
"install_opener",
"pathname2url",
"HTTPBasicAuthHandler",
"HTTPDigestAuthHandler",
"HTTPPasswordMgrWithDefaultRealm",
"ProxyHandler",
"quote",
"Request",
"splitattr",
"splitpasswd",
"splitport",
"splituser",
"unquote",
"url2pathname",
"urlopen",
))
import urllib.error
_alias(urlerr, urllib.error, (
"HTTPError",
"URLError",
))
import http.server
_alias(httpserver, http.server, (
"HTTPServer",
"BaseHTTPRequestHandler",
"SimpleHTTPRequestHandler",
"CGIHTTPRequestHandler",
))
try:
xrange
except NameError:
import builtins
builtins.xrange = range