context: explicitly tests for None Changeset 9e57033fec0c removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

filemerge: explicitly tests for None Changeset 758526333dec removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

hgweb: explicitly tests for None Changeset 7dafa8d0e006 removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

hgweb: explicitly tests for None in webutil Changeset d2878bec55bd removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

match: explicitly tests for None Changeset 6168d4b93634 removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

mq: explicitly tests for None Changeset fd3d8eb7f545 removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

rebase: explicitly tests for None Changeset 361bccce566a removed the mutable default value, but did not explicitly tested for None. Such implicit checking can introduce semantic and performance issue. We move to an explicit check for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations

py3: use iter() instead of iterkeys()

localrepo: deprecated '_link' That method had a total on 1 internal user... G: changed mercurial/localrepo.py

localrepo: use self.wvfs.islink directly We are about to deprecate the helper function.

py3: convert opts back to bytes for status

parsers: handle refcounting of "parents" consistently Py_None can be refcounted like any other Python object. So do that.

py3: make py3 compat.iterbytestr simpler and faster With Python 3.4.3, timit says 11.9 usec-> 6.44 usec. With Python 3.6.0, timeit says 14.1 usec -> 9.55 usec.

py3: optimize py3 compat.bytechr using Struct.pack With Python 3.4.3, timeit says 0.437 usec -> 0.0685 usec. With Python 3.6, timeit says 0.157 usec -> 0.0907 usec. So it's faster on both versions, but the speedup varies a lot. Thanks to Gregory Szorc for the suggestion.

tests: properly drop back to root dir in test-status.t

dirstate: use list comprehension to get a list of keys We have used dict.keys() which returns a dict_keys() object instead of list on Python 3. So this patch replaces that with list comprehension which works both on Python 2 and 3.

match: slice over bytes to get the byteschr instead of ascii value

match: make regular expression bytes to prevent TypeError

scmutil: make function name bytes in class filecache func.__name__ returns unicodes and this leads to keyerror when we try to do filecache[''] by passing bytes.

localrepo: deprecate 'wfile' The method had very few users and the modern form is shorter. So let us deprecates another method of the localrepo class.

eol: use 'wvfs' instead of 'wfile' Method is about to be deprecated and the modern form is shorter.

localrepo: use 'wvfs' instead of 'wfile' Method is about to be deprecated and the modern form is shorter.

tagmerge: use 'wvfs' instead of 'wfile' Method is about to be deprecated and the modern form is shorter.

gpg: use 'wvfs' instead of 'wfile' Method is about to be deprecated and the modern form is shorter.

test: add a basic 'test-check-pylint.t' We add a minimal check using pylint for one case we knows we care about: "mutable default" argument. We'll likely extend this over time to cover other useful checks but this is a good starting point.

localrepo: don't use mutable default argument value Caught by pylint.

httpclient: don't use mutable default argument value Caught by pylint.

largefiles: don't use mutable default argument value Caught by pylint.