config: enable Python-3

We require at least Python-2.6, but preliminary tests with Python-3.6
and 3.7 are successful. There may be a few quirks to work out, but I
believe it is ready for broader te

config: enable Python-3

We require at least Python-2.6, but preliminary tests with Python-3.6
and 3.7 are successful. There may be a few quirks to work out, but I
believe it is ready for broader testing.

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config: urllib/urlparse updates for Python-3 compatibility

config fblaslapack: use isIBM instead of manual test

ptscotch: fix tarball install for --download-ptscotch

Reported-by: Randall Mackie <rlmackie862@gmail.com>

config: Python-3 (and >=2.6) uses __self__ instead of im_self to identify bound methods

Test harness does not have requires: TODO it has TODO: reason

Commit-type: bug-fix, testing-fix, style-fix

Change outdated HAVE_VECCUDA macro to simply HAVE_CUDA for clarity/ease of maintenance.

Commit-type: style-fix

config: misc python2/3 compatibility

config: futurize filter()

Returns a list in Python-2, but a filter object in Python-3. There
are many places that test isinstance(f, list) to distinguish strings
from lists, but a filter object beh

config: futurize filter()

Returns a list in Python-2, but a filter object in Python-3. There
are many places that test isinstance(f, list) to distinguish strings
from lists, but a filter object behaves like a list for most purposes.

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config executeShellCommand: support chained commands and non-shell

The present approach of concatenating strings is problematic if paths
contain spaces or special characters. We should always use l

config executeShellCommand: support chained commands and non-shell

The present approach of concatenating strings is problematic if paths
contain spaces or special characters. We should always use lists
instead of strings, but I don't have the patience to convert all call
sites right now. I have converted a representative sample, however,
to demonstrate that the approach works. This involved a new function
Script.executeShellCommandSeq() that takes a sequence/list of commands
to be run.

A legacy pattern in BuildSystem has been to use chained sequences of
the form

cd to/dir && run command

instead of using the cwd keyword argument. This commit fixes many
such instances to use the cwd argument.

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config: Use io.StringIO instead of StringIO.StringIO

Portable to Python-3.

config: fix typo reference variable from enclosing scope instead of argument

config: use idiomatic loop instead of map

config: AttributeError instead of RuntimeError to report missing attribute

Python-2 catches RuntimeError thrown by __getattr__, but Python-3 does not.

config: return list instead of filter object

python: check for attr close to identify files

Python-3 files are not nicely identified by inheriting from a public
file object. Probably better in the long run to make the interface
clear about wh

python: check for attr close to identify files

Python-3 files are not nicely identified by inheriting from a public
file object. Probably better in the long run to make the interface
clear about what is being passed, e.g., by a keyword argument. But
for now, just change the test to work with both Python-2 and Python-3.

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python: use sort(key=) instead of sort with cmp function

For Python-3, but also cleaner.

config: eschew dict.iteritems() for dict.items()

Fast enough in Python-2 and the only way in Python-3.

config: abandon popen2 in favor of subprocess (python2 and python3)

python: convert leading tabs to spaces

config RDict: fix dict.has_key to be compatible with Python-3

config: add base.setup to delay pushLanguage until after Script.setup

Suggested-by: Matt Knepley <knepley@gmail.com>

config: use open() instead of file() to open files

This is the recommended usage and file is not defined in Python-3.

config: remove "import user"; deprecated in Python 2.6 and removed in 3

I can't imagine why anyone would want this unpredictable behavior in a
configuration system in the first place.

config: remove obsolete workarounds for Python <=2.5