[issue41259] Find adverbs is not correct on the documentation
Peter Otten <__pete...@web.de> added the comment: While I don't want to start a philosical discussion -- is that really better? Finding adverbs with a regex doesn't work in the general case -- think butterfly, panoply, well -- and the example is meant to illustrate the usage of re.findall() rather than regex syntax. "finding adverbs" is just shorter and easier to understand than "finding sequences of word characters that end with "ly". -- nosy: +peter.otten ___ Python tracker <https://bugs.python.org/issue41259> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39864] IndexError gives wrong axis info
Peter Otten <__pete...@web.de> added the comment: This is not a bug (and if it were you would have to report to numpy, not cpython). Consider: >>> import numpy >>> a = numpy.zeros((2,2,2)) >>> a[0,2] Traceback (most recent call last): File "", line 1, in IndexError: index 2 is out of bounds for axis 1 with size 2 This is probably the message you expect. However, if you write >>> a[0][2] Traceback (most recent call last): File "", line 1, in IndexError: index 2 is out of bounds for axis 0 with size 2 you split the operation into two steps, and the second axis of a is effectively the first axis of a[0]. -- nosy: +peter.otten -steven.daprano ___ Python tracker <https://bugs.python.org/issue39864> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36561] Python argparse doesn't work in the presence of my custom module
Peter Otten <__pete...@web.de> added the comment:
That's a bug in your code. You create another ArgumentParser in the toplevel
code of preprocess.py. When this module is imported directly or indirectly your
script will us this parser to parse the command line first. Minimal example:
$ cat preprocess.py
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--foo")
print(parser.parse_args())
$ cat test.py
import argparse
import preprocess
parser = argparse.ArgumentParser()
parser.add_argument("--bar")
print(parser.parse_args())
$ python3 test.py --bar 42
usage: test.py [-h] [--foo FOO]
test.py: error: unrecognized arguments: --bar 42
$
Fix: Protect toplevel code in preprocess.py with
if __name__ == "__main__":
parser = ...
...
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[issue36193] Redirected stderr not reset properly when using logging
Peter Otten <__pete...@web.de> added the comment: [Andrius] > So it is not possible to consistently manage stderr when it involves > > logging library without explicitly "manage" it? That's what I think, at least from within a script. To me redirect_xxx() always looked like a workaround to have old code write to a destination that was unforeseen in the initial design. I prefer dump_stuff(dest) to with redirect_stdout(dest): dump_stuff() That said -- do you have a suggestion how the logging library could be adapted to work smoothly with redirect_xxx()? (A compelling use case would also be nice, but note that I'm not the one who makes the decisions.) -- ___ Python tracker <https://bugs.python.org/issue36193> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36191] pubkeys.txt contains bogus keys
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[issue36193] Redirected stderr not reset properly when using logging
Peter Otten <__pete...@web.de> added the comment: I see various options to address this. (1) Change basicConfig() to use __stderr__ instead of stderr to avoid redirections from within the script. (2) Change your script to call basicConfig() explicitly, before the temporary redirection takes place. In both cases logging output will always go to the "real" stderr. (3) Write a special handler that fetches sys.stderr lazily. Here's a sketch: class StderrHandler(logging.StreamHandler): def __init__(self): super().__init__() def get_stream(self): return sys.stderr def set_stream(self, _value): pass stream = property(get_stream, set_stream) logging.basicConfig(handlers=[StderrHandler()]) As written this is likely to fail with multiple threads... My personal favourite is option (2). -- nosy: +peter.otten ___ Python tracker <https://bugs.python.org/issue36193> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35787] shlex.split inserts extra item on backslash space space
Peter Otten <__pete...@web.de> added the comment: To me the current shlex behaviour makes sense, and the shell (tested with bash) behaves the same way: $ python3 -c 'import sys; print(sys.argv)' a b ['-c', 'a', 'b'] $ python3 -c 'import sys; print(sys.argv)' a \ b ['-c', 'a', ' ', 'b'] -- nosy: +peter.otten ___ Python tracker <https://bugs.python.org/issue35787> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35273] 'eval' in generator expression behave different in dict from list
Peter Otten <__pete...@web.de> added the comment: You probably saw this is in Python 2.7 where it is the expected behaviour. All versions of Python 3 should produce the NameError. -- nosy: +peter.otten versions: +Python 3.6 -Python 2.7 ___ Python tracker <https://bugs.python.org/issue35273> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30952] [Windows] include Math extension in SQlite
Peter Otten <__pete...@web.de> added the comment:
A possible workaround is to use create_function():
>>> import sqlite3, math
>>> db = sqlite3.connect(":memory:")
>>> db.execute("select sin(?);", (math.pi,)).fetchone()
Traceback (most recent call last):
File "", line 1, in
sqlite3.OperationalError: no such function: sin
>>> db.create_function("sin", 1, math.sin)
>>> db.execute("select sin(?);", (math.pi,)).fetchone()
(1.2246467991473532e-16,)
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[issue31266] attribute error
Peter Otten added the comment: You have probably written your own re.py file which shadows the one in the standard library. Once you remove or rename your re.py the error should go away. -- nosy: +peter.otten ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue31266> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31214] os.walk has a bug on Windows
Peter Otten added the comment: Read the documentation of os.walk() again. It already walks the complete directory tree starting with src. When you invoke it again by calling your copy_dir() method recursively you will of course see once more the files and directories in the respective subdirectory. -- nosy: +peter.otten ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue31214> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue30034] csv reader chokes on bad quoting in large files
Peter Otten added the comment:
While I don't think that the csv module should second-guess broken input you
might consider "fixing" your data on the fly:
def close_quote(line):
if line.count('"') % 2:
line = line.rstrip("\n") + '"\n'
return line
with open("data.csv") as f:
for row in csv.reader(map(close_quote, f)):
print(row)
That should give the desired output.
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[issue16623] argparse help formatter does not honor non-breaking space
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[issue29290] argparse breaks long lines on NO-BREAK SPACE
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[issue29287] IDLE needs syntax highlighting for f-strings
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[issue28969] fnmatch is not threadsafe
Peter Otten added the comment: Here's another way to reproduce the error. The problem seems to be in the C implementation of _lru_cache_wrapper() / bounded_lru_cache_wrapper(). $ cat test.py import functools import threading import time @functools.lru_cache(maxsize=2) def f(v): time.sleep(.01) threads = [threading.Thread(target=f, args=(v,)) for v in [1,2,2,3,2]] for t in threads: t.start() $ ./python test.py Exception in thread Thread-5: Traceback (most recent call last): File "/somewhere/Lib/threading.py", line 916, in _bootstrap_inner self.run() File "/somewhere/Lib/threading.py", line 864, in run self._target(*self._args, **self._kwargs) KeyError: (2,) $ ./python Python 3.7.0a0 (default:654ec6ed3225+, Dec 15 2016, 11:24:30) [GCC 4.8.4] on linux -- nosy: +peter.otten, rhettinger, serhiy.storchaka ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28969> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue27468] Erroneous memory behaviour for objects created in another thread
Peter Otten added the comment: Your code relies on the assumption that when the lambda is invoked the global t is still bound to the Thread instance you are starting. It seems that this is not always the case, and I don't see why it should be guaranteed either. I don't know whether it's a good idea to store per-thread data in the Thread instance (have a look at threading.local()), but def start_thread(): t = Thread(target=lambda: f(t)) t.obj = [0] t.start() for _ in range(n_threads): start_thread() will at least avoid the global. -- nosy: +peter.otten ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27468> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue26126] Possible subtle bug when normalizing and str.translate()ing
Peter Otten added the comment:
There seems to be a connection to hash randomization. I consistently get
$ PYTHONHASHSEED=1 python3.6 ./normbug.py
BUG ('The aenid oevre', '!=', 'The AEnid oevre')
$ PYTHONHASHSEED=0 python3.6 ./normbug.py
OK ('The AEnid oevre', '==', 'The AEnid oevre')
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[issue26126] Possible subtle bug when normalizing and str.translate()ing
Peter Otten added the comment:
Not a bug. In your XFORMS dict you have
>>> ord("Æ") == 0xC6
True
Whether the value of "Æ" or 0xC6 is used by str.maketrans() depends on the
order of the dict entries which in turn is determined by the keys' hash. Remove
one and you should see consistent results.
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[issue25999] Add support of native number in bin()
Peter Otten added the comment: How would you disambiguate -1 and (for example) 2**64-1 on a 64-bit machine? Python's int is not limited to a specific number of bits. -- nosy: +peter.otten ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue25999> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24787] csv.Sniffer guesses M instead of \t or , as the delimiter
Peter Otten added the comment: The sniffer actually changes its mind in the fourth line: Python 3.4.0 (default, Jun 19 2015, 14:20:21) [GCC 4.8.2] on linux Type help, copyright, credits or license for more information. import csv csv.Sniffer().sniff(\ ... Invoice File,Credit Memo,Amount Claimed,Description,Invoice,Message, ... Sscanner ac15072911220.pdf,CM_15203,28714.32,MX Jan Feb,948198,, ... Sscanner ac15072911221.pdf,CM 16148,15600,MX Unkwon,948199,, ... ).delimiter ',' csv.Sniffer().sniff(\ ... Invoice File,Credit Memo,Amount Claimed,Description,Invoice,Message, ... Sscanner ac15072911220.pdf,CM_15203,28714.32,MX Jan Feb,948198,, ... Sscanner ac15072911221.pdf,CM 16148,15600,MX Unkwon,948199,, ... Sscanner ac15072911230.pdf,CM 16148,33488,MX Cavalier,948200,Photos don't match the invoice ... ).delimiter 'M' That line has only 5 commas while all others have 6. Unfortunately all lines contain exactly two M... -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24787 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16669] Docstrings for namedtuple
Peter Otten added the comment: Here's a variant that builds on your code, but makes for a nicer API. Single-line docstrings can be passed along with the attribute name, and with namedtuple.with_docstrings(... all info required to build the class ...) from a user perspective the factory looks like a class method: from functools import partial from collections import namedtuple def _with_docstrings(cls, typename, field_names_with_doc, *, verbose=False, rename=False, doc=None): field_names = [] field_docs = [] if isinstance(field_names_with_doc, str): field_names_with_doc = [ line for line in field_names_with_doc.splitlines() if line.strip()] for item in field_names_with_doc: if isinstance(item, str): item = item.split(None, 1) if len(item) == 1: [fieldname] = item fielddoc = None else: fieldname, fielddoc = item field_names.append(fieldname) field_docs.append(fielddoc) nt = cls(typename, field_names, verbose=verbose, rename=rename) for fieldname, fielddoc in zip(field_names, field_docs): if fielddoc is not None: new_property = property(getattr(nt, fieldname), doc=fielddoc) setattr(nt, fieldname, new_property) if doc is not None: nt.__doc__ = doc return nt namedtuple.with_docstrings = partial(_with_docstrings, namedtuple) if __name__ == __main__: Point = namedtuple.with_docstrings(Point, x abscissa\ny ordinate) Address = namedtuple.with_docstrings( Address, name Surname first_name First name city email Email address ) Whatever = namedtuple.with_docstrings( Whatever, [(foo, doc for\n foo), (bar, doc for bar), baz], doc=The Whatever class. Example for a namedtuple with multiline docstrings for its attributes.) -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16669 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23639] Not documented special names
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[issue23495] The writer.writerows method should be documented as accepting any iterable (not only a list)
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[issue23551] IDLE to provide menu options for using PIP
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[issue22760] re.sub does only first 16 replacements if re.S is used
Peter Otten added the comment:
This is not a bug; the signature of re.sub() is
sub(pattern, repl, string, count=0, flags=0)
and the fourth argument thus the 'count' delimiting the number of substitutions
that you accidentally specify as
import re
re.S
16
I recommend that you use a keyword arg to fix your code:
re.sub('x', 'a', x*20, flags=re.S)
''
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[issue22240] argparse support for python -m module in help
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[issue5950] Make zipimport work with zipfile containing comments
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[issue21553] Behaviour of modules depends on how they where imported
Peter Otten added the comment: Here's a simpler demo for what I believe you are experiencing: $ mkdir package $ cd package/ $ touch __ini__.py module.py $ export PYTHONPATH=.. $ python3 Python 3.3.2+ (default, Feb 28 2014, 00:52:16) [GCC 4.8.1] on linux Type help, copyright, credits or license for more information. import module, package.module module is package.module False Even though module and package.module correspond to the same file Python does not recognize that you intend the former to be part of a package. Your run0.py script goes through its sys.path entries and unfortunately the first entry points into a package so that all modules in that package become also visible as toplevel modules. A good way to avoid this trap is to use relative imports from . import module Traceback (most recent call last): File stdin, line 1, in module SystemError: Parent module '' not loaded, cannot perform relative import -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21553 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21177] ValueError: byte must be in range(0, 256)
Peter Otten added the comment: As every beginner will learn about (and probably overuse) range() pretty soon I think it's OK to use that form. The math-inspired notation [0, 255] may be misinterpreted as a list. You also lose the consistency of preferring half-open intervals everywhere. The third alternative I see, 0 = x 256 has the problem that it requires a name (the 'x') that may not correspond to a variable in the source code. You'd also need to clarify that x must be an int to make the message bulletproof. I think this should be left as is. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21177 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20823] Clarify copyreg.pickle() documentation
New submission from Peter Otten: The documentation for copyreg.pickle(type, function, constructor=None) has the sentence TypeError will be raised if *object* is a class or *constructor* is not callable. It's not clear to me what object refers to. I believe it refers to the first arg (called ob_type in 2.x) and classic classes which were handled with def pickle(ob_type, pickle_function, constructor_ob=None): if type(ob_type) is _ClassType: raise TypeError(copy_reg is not intended for use with classes) in 2.x If I'm right the above sentence should become. A TypeError will be raised if *constructor* is not callable. in 3.x. If I'm wrong please think of way to express the intended meaning more clearly. Another minor change: class C need not inherit from object explicitly in 3.x. -- assignee: docs@python components: Documentation messages: 212541 nosy: docs@python, peter.otten priority: normal severity: normal status: open title: Clarify copyreg.pickle() documentation versions: Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20823 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20823] Clarify copyreg.pickle() documentation
Changes by Peter Otten __pete...@web.de: -- keywords: +patch Added file: http://bugs.python.org/file34263/copyreg.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20823 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20805] Error in 3.3 Tutorial
Peter Otten added the comment: No, that's not an error. Given a class MyClass and an instance x of that class class MyClass: ... def f(self): return 42 ... x = MyClass() you usually invoke a method like so: x.f() 42 But it is also possible to break that in two steps (1) get the bound method and store it in a variable for later use: xf = x.f (2) call the bound method as often as you like: xf() 42 bound method means that the method remembers the instance it is associated with (x in the above example). Gene, while you are still learning the language please ask on the python-tutor mailing list first before resorting to the bug tracker. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20805 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20804] Sentinels identity lost when pickled (unittest.mock)
Peter Otten added the comment: From looking at the sentinel code it appears a sentinel's identity is controlled by its name alone, i. e. sentinel.foo is sentinel.foo If that's the desired behaviour it is well possible to make that indentity survive pickling. I have attached a demo script using the simplest approach -- registering the class with copyreg. If you like the general idea I'm willing to look up the alternative (a __getstate__() or __reduce__() method), too ;) -- nosy: +peter.otten Added file: http://bugs.python.org/file34256/pickle_sentinels.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20804 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20804] Sentinels identity lost when pickled (unittest.mock)
Peter Otten added the comment: I have no experience with unittest.mock, so I'm in no position to contradict... Vlastimil, could you give your use case? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20804 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20791] copy.copy(bytes) is slow
Peter Otten added the comment: Assuming that the current behaviour is by accident here's a patch that adds the bytes type to the _copy_dispatch registry. -- keywords: +patch nosy: +peter.otten Added file: http://bugs.python.org/file34244/copy_bytes.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20791 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20794] ImportError: Bad magic number in .pyc file
Peter Otten added the comment: This is expected. You cannot run/import 2.6 .pyc files in python 2.7 because the file format has changed. $ echo 'print hello' tmp.py $ python2.6 -c 'import tmp' hello $ rm tmp.py $ python2.7 -c 'import tmp' Traceback (most recent call last): File string, line 1, in module ImportError: Bad magic number in tmp.pyc Naval, if you do have the source .py make sure that you delete all occurrences of .pyc in directories preceding the directory containing .py in sys.path. Sometimes this error is the result of moving a .py file into another directory and forgetting to delete the leftover .pyc. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20794 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20791] copy.copy(bytes) is slow
Peter Otten added the comment: I did sign today (and received the confirmation email). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20791 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20714] Allow for ]] in CDATA in minidom
Peter Otten added the comment: Perhaps a look at the competition is still in order: Java silently breaks such an invalid CDATA in two, as suggested. http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.htm says No lexical check is done on the content of a CDATA section and it is therefore possible to have the character sequence ]] in the content, which is illegal in a CDATA section per section 2.7 of [XML 1.0]. The presence of this character sequence must generate a fatal error during serialization or the cdata section must be splitted before the serialization (see also the parameter split-cdata-sections in the DOMConfiguration interface). The change Artur suggested would be covered by this. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20714 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20742] 2to3 zip fixer doesn't fix for loops.
Peter Otten added the comment: Hm, I would expect that in 99 times out of 100 the extra list(...) would be removed in a manual step following the automated conversion. I'd really like to see the non-contrived example with a justified use of this evil side effect ;) -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20742 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20714] Allow for ]] in CDATA in minidom
Changes by Peter Otten __pete...@web.de: -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20714 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20729] mailbox.Mailbox does odd hasattr() check
Peter Otten added the comment: Do you expect many use cases that rely on items(), keys(), and values() being lists? Maybe it would be acceptable to make these lazy in 3.5, but keep the iterXXX() variants as aliases indefinitely. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20729 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20587] sqlite3 converter not being called
Peter Otten added the comment: Are you sure that the converter is called in Python 2.5? I've looked into the source (Modules/_sqlite/cursor.c), and if I understand the code correctly it uses the sqlite3_column_decltype() function from the sqlite3 API to determine the column type. So Python would be at the mercy of the sqlite3 implementation. -- Added file: http://bugs.python.org/file34052/demo3.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20587 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20004] csv.DictReader classic class has a property with setter
New submission from Peter Otten:
I ran into this when trying to trigger rereading the column names with
$ cat tmp.csv
alpha,beta
1,2
gamma,delta,epsilon
3,4,5
$ python
Python 2.7.2+ (default, Jul 20 2012, 22:15:08)
[GCC 4.6.1] on linux2
Type help, copyright, credits or license for more information.
import csv
with open(tmp.csv) as f:
... reader = csv.DictReader(f)
... for i in range(2):
... print next(reader)
... reader.fieldnames = None
...
{'alpha': '1', 'beta': '2'}
Traceback (most recent call last):
File stdin, line 4, in module
File /usr/lib/python2.7/csv.py, line 112, in next
d = dict(zip(self.fieldnames, row))
TypeError: zip argument #1 must support iteration
reader = csv.DictReader(...)
...
reader.fieldnames = None
I think the easiest fix would be to have it inherit from object:
class DictReader(csv.DictReader, object): pass
...
with open(tmp.csv) as f:
... reader = DictReader(f)
... for i in range(2):
... print next(reader)
... reader.fieldnames = None
...
{'alpha': '1', 'beta': '2'}
{'3': 'gamma', '5': 'epsilon', '4': 'delta'}
--
messages: 206418
nosy: peter.otten
priority: normal
severity: normal
status: open
title: csv.DictReader classic class has a property with setter
versions: Python 2.7
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[issue20004] csv.DictReader classic class has a property with setter
Peter Otten added the comment: Setting the fieldnames attribute of an existing DictReader is not documented. Eric, there is no need for an enhancement (other than for the documentation) as this already works in Python 3 where newstyle classes are the default. The heart of the bug is really the classic class with a property. I have no idea what a fix could look like that is less intrusive than promoting DictReader to a newstyle class. Maybe it would be sufficient to add a comment to the code pointing to my bug report? I've already shown one workaround (object as a mixin); another would be to set the private _fieldnames rather than fieldnames so that the getter will continue to work as designed. Looking at the current DictReader code and determining why and how it fails will be quite hard for a non-expert ;) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20004 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20004] csv.DictReader classic class has a property with setter
Peter Otten added the comment:
The proposed patch looks fine to me.
And for the record, I don't think setting fieldnames should be promoted in the
3.x documentation. Along the lines of Eric's suggestion I should have written
something like
import csv
with open(tmp.csv) as f:
... for i in range(2):
... print next(csv.DictReader(f))
...
{'alpha': '1', 'beta': '2'}
{'epsilon': '5', 'gamma': '3', 'delta': '4'}
which would have spared you the hustle ;)
Thank you for your effort!
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[issue19808] IDLE applies syntax highlighting to user input in its shell
Peter Otten added the comment: I think the prompt can easily be treated differently because it is written to stderr. I don't see a difference for user input between input() and raw_input() on Linux with Python 2.7.2+ -- syntax-highlighting is applied to both. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19808 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19808] IDLE applys syntax highlighting to user input in its shell
New submission from Peter Otten: For example when you type input(What shall I do? ) Run for your life! in its shell window IDLE shows the 'for' as if it were a keyword. The same happens if you run a script that requires user interaction. -- components: IDLE messages: 204566 nosy: peter.otten priority: normal severity: normal status: open title: IDLE applys syntax highlighting to user input in its shell ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19808 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19808] IDLE applies syntax highlighting to user input in its shell
Changes by Peter Otten __pete...@web.de: -- title: IDLE applys syntax highlighting to user input in its shell - IDLE applies syntax highlighting to user input in its shell ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19808 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19657] List comprehension conditional evaluation order seems backwards
Peter Otten added the comment: I believe you are misinterpreting what you are seeing. Empty lines read from a file do not produce an empty string, you get \n instead which is true in a boolean context. Try [line.split()[0] for line in lines if line.strip() and not line.startswith(#)] or add an extra check for all-whitespace line [... if line and not line.isspace() and not line.startswith(#)] -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19657 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19528] logger.config.fileConfig cant cope with files starting with an 'r' on windows
Peter Otten added the comment:
Simon, in your code you build the config file with
'''...
args=('{0}', 'a', 131072, 10)
...
'''.format(filename)
The logging module uses eval() to process the args tuple, and a filename
containing a bashlash will not roundtrip that way. Have a look at the .conf
file, it contains something like
args=('whatever\testlog\really_cool_logging.log', 'a', 131072, 10)
when it should be
args=('whatever\\testlog\\really_cool_logging.log', 'a', 131072, 10)
To fix this you should drop the quote chars and use the string representation
of the filename:
'''...
args=({0!r}, 'a', 131072, 10)
...
'''.format(filename)
In short: I think Eric was right with initial assumption.
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[issue19210] Unicode Objects in Tuples
Peter Otten added the comment: Be aware that for a 1-tuple the trailing comma is mandatory: print (uäöü) # this is a string despite the suggestive parens äöü print (uäöü,) # this is a tuple (u'\xe4\xf6\xfc',) -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19210 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue18892] sqlite3, valued records not persisted, default ones are
Peter Otten added the comment: David means you should replace the line conn.commit in your script which does not invoke the method with conn.commit() Side note: as long as you are a newbie it is a good idea to ask on the python mailing list first before adding a report to the bug tracker. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18892 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue18788] Proof of concept: implicit call syntax
Peter Otten added the comment: a bare expression is not call Wouldn't that silently swallow a lot of bare print statements? -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18788 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue18219] csv.DictWriter is slow when writing files with large number of columns
Peter Otten added the comment: Note that set operations on dict views work with lists, too. So the only change necessary is to replace wrong_fields = [k for k in rowdict if k not in self.fieldnames] with wrong_fields = rowdict.keys() - self.filenames (A backport to 2.7 would need to replace keys() with viewkeys()) -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18219 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17020] random.random() generating values = 1.0
Peter Otten added the comment: This could be a duplicate of issue14591. -- nosy: +peter.otten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17020 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15545] sqlite3.Connection.iterdump() does not work with row_factory = sqlite3.Row
Peter Otten added the comment: Here's a minimal fix that modifies the sql in sqlite3.dump._iterdump() to sort the tables by name. It is then no longer necessary to sort the resultset in Python for the unit tests to pass. -- keywords: +patch nosy: +peter.otten Added file: http://bugs.python.org/file26710/iterdump.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15545 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15074] Strange behaviour of python cmd module. (Ignores slash)
Peter Otten __pete...@web.de added the comment:
Not a python bug. You are ommitting an important detail of the stackoverflow
example in your code:
# we want to treat '/' as part of a word, so override the delimiters
readline.set_completer_delims(' \t\n;')
Please turn to the Python mailing list if you need more help.
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[issue14638] pydoc error on instance of a custom class
Peter Otten __pete...@web.de added the comment: Patch upload, second attempt. -- keywords: +patch nosy: +peter.otten Added file: http://bugs.python.org/file25298/render_doc.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14638 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14612] Crash after modifying f_lineno
Peter Otten __pete...@web.de added the comment: frame_setlineno() doesn't keep track of with blocks. Here's a patch. -- keywords: +patch nosy: +potten Added file: http://bugs.python.org/file25258/frame_setlineno.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14612 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: [issue14591] Value returned by random.random() out of valid range
Dave Reid wrote: New submission from Dave Reid seabass...@gmail.com: A particular combination of seed and jumpahead calls seems to force the MT generator into a state where it produces a random variate that is outside the range 0-1. Problem looks like it might be in _randommodule.c:genrand_int32, which produces a value 0x for the given state, but I don't understand the generator well enough to debug any further. The attached test case produces 1.58809998297 as the 2nd variate in Python 2.7 and 1.35540900431 as the 23rd variate in Python 2.7.3. The problem occurs on both Linux (CentOS 6) and Mac OSX (10.6.8), both 64-bit. A simple way to reproduce the problem: import random r = random.Random() a, b, c = r.getstate() r.setstate((a, (0x,)*len(b), c)) r.jumpahead(1) r.random() 1.8015423506628903 It looks like in random_jumpahead mt[i] += i+1; needs to be masked mt[i] = (mt[i] + i + 1) 0xUL; (random_setstate already does that) ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13510] Clarify that readlines() is not needed to iterate over a file
New submission from Peter Otten __pete...@web.de: I've been looking at code on the tutor mailing list for some time, and for line in file.readlines(): ... is a common idiom there. I suppose this is because the readlines() method is easily discoverable while the proper way (iterate over the file object directly) is not. A note added to the readlines() documentation might help: You don't need the readlines() method to loop over the lines of a file. for line in file: process(line) consumes less memory and is often faster. -- assignee: docs@python components: Documentation messages: 148679 nosy: docs@python, potten priority: normal severity: normal status: open title: Clarify that readlines() is not needed to iterate over a file type: feature request ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12888] html.parser.HTMLParser.unescape works only with the first 128 entities
Peter Otten __pete...@web.de added the comment: The unescape() method uses re.sub(regex, sub, re.ASCII), but the third argument is count, not flags. Fix is easy: use re.sub(regex, sub, flags=re.ASCII). -- keywords: +patch nosy: +potten Added file: http://bugs.python.org/file23092/unescape_bug.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12888 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7764] Doc for itertools recipe consume is complicated and less efficient
Peter Otten __pete...@web.de added the comment: As noted on comp.lang.python the implementation can be simplified to def consume(items, n): next(islice(items, n, n), None) When I suggested the above I wasn't aware that consume(items, None) should exhaust the entire iterator. Unfortunately I've not found an elegant way to add that functionality. -- nosy: +potten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7764 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5832] os.path.walk fails to descend into a directory whose name ends with a space
Peter Otten __pete...@web.de added the comment: Is BBDO Atlanta a symbolic link?. These are skipped by os.path.walk(). (The behaviour of os.walk() can be specified with the followsymlinks argument.) -- nosy: +potten ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5832 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2527] Pass a namespace to timeit
Peter Otten [EMAIL PROTECTED] added the comment: Alexander, I'm fine with a more specific argument name. ns was what the Timer already used internally. Antoine, from __main__ import name1, ..., nameN works fine on the command line, but inside a function you'd have to declare the names you want to pass to the Timer as globals which I find a bit clumsy. Apart from giving a syntax warning a star-import affects the generated bytecode and produces the (slower) LOAD_NAME instead of LOAD_FAST. __ Tracker [EMAIL PROTECTED] http://bugs.python.org/issue2527 __ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2527] Pass a namespace to timeit
New submission from Peter Otten [EMAIL PROTECTED]: I'd like to suggest a different approach than the one taken in rev. 54348 to improve timeit's scripting interface: allow passing it a namespace. Reasons: - It has smaller overhead for functions that take an argument: def f(a): pass ... # trunk min(ht.Timer(lambda f=f: f(42)).repeat()) 0.54068493843078613 # my patch min(mt.Timer(f(42), ns=dict(f=f)).repeat()) 0.29009604454040527 - it is more flexible. Example: # working code, requires matplotlib from timeit import Timer from time import sleep def linear(i): sleep(.05*i) def quadratic(i): sleep(.01*i**2) x = range(10) y = [] for a in x: y.append([min(Timer(f(a), ns=dict(f=f, a=a)).repeat(1, 1)) for f in linear, quadratic]) from pylab import plot, show plot(x, y) show() The above code works unaltered inside a function, unlike the hacks using from __main__ import - the implementation is simpler and should be easy to maintain. The provided patch is against 2.5.1. If it has a chance of being accepted I'm willing to jump through the necessary hoops: documentation, tests, etc. -- components: Library (Lib) files: diff_against_2_5_1.txt messages: 64805 nosy: potten severity: normal status: open title: Pass a namespace to timeit type: feature request versions: Python 2.6 Added file: http://bugs.python.org/file9916/diff_against_2_5_1.txt __ Tracker [EMAIL PROTECTED] http://bugs.python.org/issue2527 __ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
