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mp/mp-python3.patch

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diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/doc/CMakeLists.txt.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/doc/CMakeLists.txt
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/doc/CMakeLists.txt.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/doc/CMakeLists.txt 2020-02-13 15:45:51.942114727 -0700
@@ -48,7 +48,7 @@ endif ()
add_prefix(doc_deps ../ ${MP_HEADERS})
add_custom_target(doc
- COMMAND python ${BUILD_DOCS}
+ COMMAND python3 ${BUILD_DOCS}
DEPENDS conf.py ${doc_deps} ${amplgsl_docs})
install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/ampl.github.io/
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-linux.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-linux.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-linux.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-linux.py 2020-02-13 15:22:47.654450099 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""
Set up build environment on Ubuntu or other Debian-based
Linux distribution.
@@ -10,7 +10,7 @@ buildbot: install buildbot slave
"""
import platform, re, os, shutil
-from bootstrap import *
+from .bootstrap import *
from subprocess import check_call, Popen, PIPE
if __name__ == '__main__':
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-osx.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-osx.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-osx.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-osx.py 2020-02-13 15:22:24.535839893 -0700
@@ -1,8 +1,7 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# Set up build environment on OS X Moutain Lion.
-from __future__ import print_function
-from bootstrap import *
+from .bootstrap import *
import glob, os, sys, tempfile
from subprocess import call, check_call
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap.py 2020-02-13 15:21:39.224603644 -0700
@@ -1,6 +1,5 @@
# Common bootstrap functionality.
-from __future__ import print_function
import glob, os, platform, re, shutil, sys
import tarfile, tempfile, uuid, zipfile
from contextlib import closing
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-windows.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-windows.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-windows.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/bootstrap-windows.py 2020-02-13 15:23:25.110818565 -0700
@@ -1,8 +1,7 @@
# Set up build environment on 64-bit Windows.
-from __future__ import print_function
import os, shutil, tempfile
-from bootstrap import *
+from .bootstrap import *
from glob import glob
from subprocess import check_call, check_output
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/create-ubuntu-image.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/create-ubuntu-image.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/create-ubuntu-image.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/bootstrap/create-ubuntu-image.py 2020-02-13 15:11:03.171308668 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""
Create a base docker image for Ubuntu Lucid.
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/build-docs.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/build-docs.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/build-docs.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/build-docs.py 2020-02-14 10:11:07.288162263 -0700
@@ -1,12 +1,11 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""Build documentation.
Usage: build-docs.py [extract-docs <file>]
"""
-from __future__ import print_function
import fileutil, mmap, os, re, shutil
-from subprocess import call, check_call, check_output, Popen, PIPE
+from subprocess import check_call, Popen, PIPE
from docopt import docopt
mp_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
@@ -14,21 +13,6 @@ mp_dir = os.path.dirname(os.path.dirname
def run(*args, **kwargs):
check_call(args, **kwargs)
-def create_virtualenv(venv_dir):
- "Create and activate virtualenv in the given directory."
- # File "check" is used to make sure that we don't have
- # a partial environment in case virtualenv was interrupted.
- check_path = os.path.join(venv_dir, 'check')
- if not os.path.exists(check_path):
- run('virtualenv', venv_dir)
- os.mknod(check_path)
- # Activate virtualenv.
- import sysconfig
- scripts_dir = os.path.basename(sysconfig.get_path('scripts'))
- activate_this_file = os.path.join(venv_dir, scripts_dir, 'activate_this.py')
- with open(activate_this_file) as f:
- exec(f.read(), dict(__file__=activate_this_file))
-
def extract_docs(filename, output_dir):
"Extract the AMPLGSL documentation from the code."
output = None
@@ -36,9 +20,9 @@ def extract_docs(filename, output_dir):
if not os.path.exists(output_dir):
os.mkdir(output_dir)
with open(filename, 'r+b') as input:
- map = mmap.mmap(input.fileno(), 0)
- for i in re.finditer(r'/\*\*(.*?)\*/', map, re.DOTALL):
- s = re.sub(r'\n +\* ?', r'\n', i.group(1))
+ mm = mmap.mmap(input.fileno(), 0)
+ for i in re.finditer(rb'/\*\*(.*?)\*/', mm, re.DOTALL):
+ s = re.sub(r'\n +\* ?', r'\n', i.group(1).decode('utf-8'))
s = re.sub(r'\$(.+?)\$', r':math:`\1`', s, flags=re.DOTALL)
m = re.search(r'@file (.*)', s)
if m:
@@ -48,7 +32,7 @@ def extract_docs(filename, output_dir):
output = open(os.path.join(output_dir, filename + '.rst'), 'w')
s = s[:m.start()] + s[m.end():]
output.write(s.rstrip(' '))
- map.close()
+ mm.close()
def get_mp_version():
filename = os.path.join(os.path.dirname(__file__), '..', 'CMakeLists.txt')
@@ -58,13 +42,6 @@ def get_mp_version():
if m:
return m.group(1)
-def pip_install(package, **kwargs):
- "Install package using pip."
- commit = kwargs.get('commit')
- if commit:
- package = 'git+git://github.com/{0}.git@{1}'.format(package, commit)
- run('pip', 'install', '-q', package)
-
def copy_content(src_dir, dst_dir):
"Copy content of the src_dir to dst_dir recursively."
for entry in os.listdir(src_dir):
@@ -77,16 +54,11 @@ def copy_content(src_dir, dst_dir):
shutil.copyfile(src, dst)
def build_docs(workdir, doxygen='doxygen'):
- create_virtualenv(os.path.join(workdir, 'build', 'virtualenv'))
- # Install Sphinx and Breathe.
- pip_install('sphinx==1.3.1')
- pip_install('breathe', check_version='4.1.0')
-
# Clone the ampl.github.io repo.
repo = 'ampl.github.io'
repo_dir = os.path.join(workdir, repo)
if not os.path.exists(repo_dir):
- run('git', 'clone', 'https://github.com/ampl/{}.git'.format(repo), cwd=workdir)
+ shutil.copytree(os.path.join(mp_dir, repo), repo_dir)
# Copy API docs and the database connection guides to the build directory.
# The guides are not stored in the mp repo to avoid polluting history with
@@ -129,7 +101,7 @@ def build_docs(workdir, doxygen='doxygen
JAVADOC_AUTOBRIEF = YES
ALIASES = "rst=\verbatim embed:rst"
ALIASES += "endrst=\endverbatim"
- '''.format(mp_dir))
+ '''.format(mp_dir).encode('utf-8'))
returncode = p.returncode
if returncode == 0:
# Pass the MP version via environment variables rather than command-line
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-demo-packages.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-demo-packages.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-demo-packages.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-demo-packages.py 2020-02-13 15:25:54.934292448 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""Create AMPL demo packages.
Usage:
@@ -8,14 +8,13 @@ Options:
--cache Cache downloaded packages (for debugging).
"""
-from __future__ import print_function
import fileutil, gzip, os, shutil, stat, subprocess
-import tarfile, tempfile, ctxtimer, urllib, zipfile
+import tarfile, tempfile, ctxtimer, urllib.request, urllib.parse, zipfile
from docopt import docopt
from glob import glob
from sets import Set
-from StringIO import StringIO
-from urlparse import urlparse
+from io import StringIO
+from urllib.parse import urlparse
# URL for downloading student versions of AMPL binaries.
student_url = 'http://www.ampl.com/netlib/ampl/student/'
@@ -63,7 +62,7 @@ def retrieve_cached(url, system = None):
print('Using cached version of', filename)
else:
print('Downloading', filename)
- urllib.urlretrieve(url, cached_path)
+ urllib.request.urlretrieve(url, cached_path)
return cached_path
# Extract files from amplcml.zip.
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-packages.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-packages.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-packages.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-packages.py 2020-02-13 15:24:36.877608531 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""Create packages of AMPL solvers and libraries.
@@ -6,7 +6,6 @@ Usage:
create-packages.py [update]
"""
-from __future__ import print_function
import docopt, fileutil, os, re, shutil, subprocess, tempfile, zipfile
project = "ampl"
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-solver-package.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-solver-package.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-solver-package.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/create-solver-package.py 2020-02-13 15:26:12.420997611 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
"""Create a solver source package for AMPL use.
@@ -6,7 +6,6 @@ Usage:
create-solver-packages.py <solver>
"""
-from __future__ import print_function
import docopt, os, zipfile
mp_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/ctxtimer.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/ctxtimer.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/ctxtimer.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/ctxtimer.py 2020-02-13 15:21:20.295922221 -0700
@@ -1,6 +1,5 @@
# A with statement context based timer.
-from __future__ import print_function
from contextlib import contextmanager
import sys, timeit
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/docopt.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/docopt.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/docopt.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/docopt.py 2020-02-13 15:20:13.337049167 -0700
@@ -81,7 +81,7 @@ def transform(pattern):
while groups:
children = groups.pop(0)
parents = [Required, Optional, OptionsShortcut, Either, OneOrMore]
- if any(t in map(type, children) for t in parents):
+ if any(t in list(map(type, children)) for t in parents):
child = [c for c in children if type(c) in parents][0]
children.remove(child)
if type(child) is Either:
@@ -181,12 +181,12 @@ class Option(LeafPattern):
def __init__(self, short=None, long=None, argcount=0, value=False):
assert argcount in (0, 1)
- self.short, self.long, self.argcount = short, long, argcount
+ self.short, self.long, self.argcount = short, int, argcount
self.value = None if value is False and argcount else value
@classmethod
def parse(class_, option_description):
- short, long, argcount, value = None, None, 0, False
+ short, int, argcount, value = None, None, 0, False
options, _, description = option_description.strip().partition(' ')
options = options.replace(',', ' ').replace('=', ' ')
for s in options.split():
@@ -199,7 +199,7 @@ class Option(LeafPattern):
if argcount:
matched = re.findall('\[default: (.*)\]', description, flags=re.I)
value = matched[0] if matched else None
- return class_(short, long, argcount, value)
+ return class_(short, int, argcount, value)
def single_match(self, left):
for n, pattern in enumerate(left):
@@ -300,21 +300,21 @@ class Tokens(list):
def parse_long(tokens, options):
"""long ::= '--' chars [ ( ' ' | '=' ) chars ] ;"""
- long, eq, value = tokens.move().partition('=')
- assert long.startswith('--')
+ int, eq, value = tokens.move().partition('=')
+ assert int.startswith('--')
value = None if eq == value == '' else value
- similar = [o for o in options if o.long == long]
+ similar = [o for o in options if o.long == int]
if tokens.error is DocoptExit and similar == []: # if no exact match
- similar = [o for o in options if o.long and o.long.startswith(long)]
+ similar = [o for o in options if o.long and o.long.startswith(int)]
if len(similar) > 1: # might be simply specified ambiguously 2+ times?
raise tokens.error('%s is not a unique prefix: %s?' %
- (long, ', '.join(o.long for o in similar)))
+ (int, ', '.join(o.long for o in similar)))
elif len(similar) < 1:
argcount = 1 if eq == '=' else 0
- o = Option(None, long, argcount)
+ o = Option(None, int, argcount)
options.append(o)
if tokens.error is DocoptExit:
- o = Option(None, long, argcount, value if argcount else True)
+ o = Option(None, int, argcount, value if argcount else True)
else:
o = Option(similar[0].short, similar[0].long,
similar[0].argcount, similar[0].value)
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/download.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/download.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/download.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/download.py 2020-02-13 15:27:21.146838851 -0700
@@ -1,6 +1,6 @@
# A file downloader.
-import contextlib, os, tempfile, ctxtimer, urllib2, urlparse
+import contextlib, os, tempfile, ctxtimer, urllib.request, urllib.error, urllib.parse
class Downloader:
def __init__(self, dir=None):
@@ -12,18 +12,18 @@ class Downloader:
# with d.download(url) as f:
# use_file(f)
def download(self, url, cookie=None):
- suffix = os.path.splitext(urlparse.urlsplit(url)[2])[1]
+ suffix = os.path.splitext(urllib.parse.urlsplit(url)[2])[1]
fd, filename = tempfile.mkstemp(suffix=suffix, dir=self.dir)
os.close(fd)
with ctxtimer.print_time('Downloading', url, 'to', filename):
- opener = urllib2.build_opener()
+ opener = urllib.request.build_opener()
if cookie:
opener.addheaders.append(('Cookie', cookie))
num_tries = 2
for i in range(num_tries):
try:
f = opener.open(url)
- except urllib2.URLError, e:
+ except urllib.error.URLError as e:
print('Failed to open url', url)
continue
length = f.headers.get('content-length')
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/fileutil.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/fileutil.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/fileutil.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/fileutil.py 2020-02-13 15:23:52.255360892 -0700
@@ -1,6 +1,5 @@
# File utils.
-from __future__ import print_function
import errno, os, shutil, zipfile
# Delete an entire directory tree if it exists.
@@ -31,7 +30,7 @@ def make_archive(archive_name, dirname):
if os.path.islink(path):
zipinfo = zipfile.ZipInfo(path)
zipinfo.create_system = UNIX
- zipinfo.external_attr = 2716663808L
+ zipinfo.external_attr = 2716663808
zip.writestr(zipinfo, os.readlink(path))
else:
zip.write(path, path)
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/get-options.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/get-options.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/get-options.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/get-options.py 2020-02-13 15:11:03.187308399 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# This scripts extract options from solvers and formats them in HTML.
import errno, os, sys
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/travis-build.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/travis-build.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/travis-build.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/travis-build.py 2020-02-13 15:21:02.537221108 -0700
@@ -1,7 +1,6 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# Build the project on Travis CI.
-from __future__ import print_function
import os, re, shutil, tarfile, tempfile
from bootstrap import bootstrap
from contextlib import closing
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-dependencies.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-dependencies.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-dependencies.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-dependencies.py 2020-02-13 15:11:03.177308567 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# Updates dependencies integrated into the source tree such as C++ Format.
import download, os, re, shutil, zipfile, fileutil
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-netlib-branch.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-netlib-branch.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-netlib-branch.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/support/update-netlib-branch.py 2020-02-13 15:11:03.176308584 -0700
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# This script updates the "netlib" branch from the AMPL Solver Library
# repository at rsync ampl.com::ampl/
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/generate-nl-files.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/generate-nl-files.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/generate-nl-files.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/generate-nl-files.py 2020-02-13 15:17:56.691348963 -0700
@@ -1,11 +1,11 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
# This scripts generates test .nl files from AMPL model and data files.
from subprocess import Popen, PIPE
def generate_nl_file(stub, *files, **kwargs):
code = ''
- for key, value in kwargs.iteritems():
+ for key, value in kwargs.items():
if key == 'code':
code = value
else:
diff -up mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/support/util.py.orig mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/support/util.py
--- mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/support/util.py.orig 2019-12-09 11:21:17.000000000 -0700
+++ mp-51aeb2c386342ed4f48cc78d3df9e4e57a70f667/test/support/util.py 2020-02-13 15:18:38.826639813 -0700
@@ -1,5 +1,5 @@
import sys
-from cStringIO import StringIO
+from io import StringIO
# Captures output to stdout in a block.
# Usage:
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