1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
"""Add things to old Pythons so I can pretend they are newer."""
# This file does lots of tricky stuff, so disable a bunch of lintisms.
# pylint: disable=redefined-builtin
# pylint: disable=import-error
# pylint: disable=no-member
# pylint: disable=unused-import
# pylint: disable=no-name-in-module
import os, re, sys
# Pythons 2 and 3 differ on where to get StringIO.
try:
from cStringIO import StringIO
BytesIO = StringIO
except ImportError:
from io import StringIO, BytesIO
# What's a string called?
try:
string_class = basestring
except NameError:
string_class = str
# Where do pickles come from?
try:
import cPickle as pickle
except ImportError:
import pickle
# range or xrange?
try:
range = xrange
except NameError:
range = range
# A function to iterate listlessly over a dict's items.
try:
{}.iteritems
except AttributeError:
def iitems(d):
"""Produce the items from dict `d`."""
return d.items()
else:
def iitems(d):
"""Produce the items from dict `d`."""
return d.iteritems()
# Reading Python source and interpreting the coding comment is a big deal.
if sys.version_info >= (3, 0):
# Python 3.2 provides `tokenize.open`, the best way to open source files.
import tokenize
try:
open_python_source = tokenize.open # pylint: disable=E1101
except AttributeError:
from io import TextIOWrapper
detect_encoding = tokenize.detect_encoding # pylint: disable=E1101
# Copied from the 3.2 stdlib:
def open_python_source(fname):
"""Open a file in read only mode using the encoding detected by
detect_encoding().
"""
buffer = open(fname, 'rb')
encoding, _ = detect_encoding(buffer.readline)
buffer.seek(0)
text = TextIOWrapper(buffer, encoding, line_buffering=True)
text.mode = 'r'
return text
else:
def open_python_source(fname):
"""Open a source file the best way."""
return open(fname, "rU")
# Python 3.x is picky about bytes and strings, so provide methods to
# get them right, and make them no-ops in 2.x
if sys.version_info >= (3, 0):
def to_bytes(s):
"""Convert string `s` to bytes."""
return s.encode('utf8')
def to_string(b):
"""Convert bytes `b` to a string."""
return b.decode('utf8')
def binary_bytes(byte_values):
"""Produce a byte string with the ints from `byte_values`."""
return bytes(byte_values)
def byte_to_int(byte_value):
"""Turn an element of a bytes object into an int."""
return byte_value
def bytes_to_ints(bytes_value):
"""Turn a bytes object into a sequence of ints."""
# In Py3, iterating bytes gives ints.
return bytes_value
else:
def to_bytes(s):
"""Convert string `s` to bytes (no-op in 2.x)."""
return s
def to_string(b):
"""Convert bytes `b` to a string (no-op in 2.x)."""
return b
def binary_bytes(byte_values):
"""Produce a byte string with the ints from `byte_values`."""
return "".join(chr(b) for b in byte_values)
def byte_to_int(byte_value):
"""Turn an element of a bytes object into an int."""
return ord(byte_value)
def bytes_to_ints(bytes_value):
"""Turn a bytes object into a sequence of ints."""
for byte in bytes_value:
yield ord(byte)
# Md5 is available in different places.
try:
import hashlib
md5 = hashlib.md5
except ImportError:
import md5
md5 = md5.new
try:
# In Py 2.x, the builtins were in __builtin__
BUILTINS = sys.modules['__builtin__']
except KeyError:
# In Py 3.x, they're in builtins
BUILTINS = sys.modules['builtins']
# imp was deprecated in Python 3.3
try:
import importlib, importlib.util
imp = None
except ImportError:
importlib = None
# we only want to use importlib if it has everything we need.
try:
importlib_util_find_spec = importlib.util.find_spec
except Exception:
import imp
importlib_util_find_spec = None
try:
PYC_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER
except AttributeError:
PYC_MAGIC_NUMBER = imp.get_magic()
def import_local_file(modname):
"""Import a local file as a module.
Opens a file in the current directory named `modname`.py, imports it
as `modname`, and returns the module object.
"""
try:
from importlib.machinery import SourceFileLoader
except ImportError:
SourceFileLoader = None
modfile = modname + '.py'
if SourceFileLoader:
mod = SourceFileLoader(modname, modfile).load_module()
else:
for suff in imp.get_suffixes():
if suff[0] == '.py':
break
with open(modfile, 'r') as f:
# pylint: disable=W0631
# (Using possibly undefined loop variable 'suff')
mod = imp.load_module(modname, f, modfile, suff)
return mod
|
