Re: # of Months between two dates
On Sunday, August 8, 2010 at 11:46:51 PM UTC+5:30, MRAB wrote: > Greg Lindstrom wrote: > > I work for a company that processes claims for the health care industry > > (Novasys Health, recently purchased by Centene Corp). My current > > assignment has me writing a routine to compute insurance premiums. One > > of the requirements is to determine how many months a policy has been in > > effect. The datetime module will give me the number of days but, with > > months having different lengths, that does not do me much good. I've > > looked in the calendar library but didn't see anything there, either. > > > > I've written a function to return the months between date1 and date2 but > > I'd like to know if anyone is aware of anything in the standard library > > to do the same? For bonus points, does anyone know if postgres can do > > the same (we use a lot of date/time funcitons in postgres, already, but > > didn't see this problem addressed). > > > [snip] > A simple expression is: > > diff = (current_year - start_year) * 12 + (current_month - start_month) > > According to this, if a policy started on 31 July 2010, then on 1 August > 2010 it has been in effect for 1 month. Is this reasonable? It depends! > > It's probably better to write the function yourself according to what > makes sense in your use-case, and document its behaviour clearly. Thanks for that answer -- https://mail.python.org/mailman/listinfo/python-list
RegEx to match set of lines
Hello, I would like to match set of lines from the below data. this data comes from one of the network Part of data : [ If circuit type is OCHCC then I need Circuit name and service ID from that group ] Circuit ID: ad8a0165:25 *Circuit Name: T3A_100G_SD20* Circuit Version: 0 Circuit Monitor: false Circuit Size: OCH-TRAIL *Circuit Type: Circuits::OCHCC_OVER_SUPER_CHANNEL_CIRCUIT* Circuit Dir: Bidirectional Circuit SLA: 0 Circuit OchncChannel: 191.35(1566_72) [freq=19135000/dim=5000] Circuit OchncDir: 0 Circuit isGmpls: true *Circuit GmplsInfo.ServiceId: ad8a0165:25* Circuit GmplsInfo.AllowedOptOperZone: 4 Circuit GmplsInfo.IsUni: false Circuit GmplsInfo.restorationMode: 0 Circuit GmplsInfo.revertiveMode: 0 Circuit GmplsInfo.revertiveSoakTime: 60 Circuit GmplsInfo.restorationStatus: 0 Circuit GmplsInfo.operZone: 3 Circuit GmplsInfo.priority: 0 Circuit GmplsInfo.circuitLabel: T3A_100G_SD20 Circuit GmplsInfo.downstreamPwrOffset: 0 Circuit GmplsInfo.upstreamPwrOffset: 0 Circuit GmplsInfo.allowRegens: 0 Circuit GmplsInfo.isRegenerated: 0 Circuit GmplsInfo.ochncChannels [n: 1] 0] 191.35(1566_72) [1] Circuit GmplsInfo.diversity [n: 0] Circuit GmplsInfo.wsonSignalingVersion: Circuits::WSON_VER_UPGRADED Circuit Flags: 0x0 --> numb of sources[1] *Circuit Source #0: NodeId=ad8a0165* PortNum=0x5002 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE --> numb of drops[1] *Circuit Drop #0: NodeId=ad8a0169* PortNum=0x5002 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE PathProtection=Path Unprotected FULL data is below Cmd: |dumpCircuitList| () Circuit object list: End of Circuit List done 05:14:21 telnet-1@tcc102> Cmd: |dumpCircuitList| () Circuit object list: End of Circuit List done 05:14:23 telnet-1@tcc104> Cmd: |dumpCircuitList| () Circuit object list: End of Circuit List done 05:14:25 telnet-1@tcc103> Cmd: |dumpCircuitList| () Circuit object list: Circuit ID: ad8a0165:26 Circuit Name: TRAIL-T3A_100G_SD20 Circuit Version: 0 Circuit Monitor: false Circuit Size: OCHNC-NOSPEC Circuit Type: Circuits::SUPER_CHANNEL_TRAIL_CIRCUIT Circuit Dir: Bidirectional Circuit SLA: 0 Circuit OchncChannel: 191.35(1566_72) [freq=19135000/dim=5000] Circuit OchncDir: 0 Circuit isGmpls: true Circuit GmplsInfo.ServiceId: ad8a0165:26 Circuit GmplsInfo.AllowedOptOperZone: 4 Circuit GmplsInfo.IsUni: false Circuit GmplsInfo.restorationMode: 0 Circuit GmplsInfo.revertiveMode: 0 Circuit GmplsInfo.revertiveSoakTime: 60 Circuit GmplsInfo.restorationStatus: 0 Circuit GmplsInfo.operZone: 3 Circuit GmplsInfo.priority: 0 Circuit GmplsInfo.circuitLabel: T3A_100G_SD20 Circuit GmplsInfo.downstreamPwrOffset: 0 Circuit GmplsInfo.upstreamPwrOffset: 0 Circuit GmplsInfo.allowRegens: 0 Circuit GmplsInfo.isRegenerated: 0 Circuit GmplsInfo.ochncChannels [n: 1] 0] 191.35(1566_72) [1] Circuit GmplsInfo.diversity [n: 0] Circuit GmplsInfo.wsonSignalingVersion: Circuits::WSON_VER_UPGRADED Circuit Flags: 0x0 --> numb of sources[1] Circuit Source #0: NodeId=ad8a0165 PortNum=0x5003 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE --> numb of drops[1] Circuit Drop #0: NodeId=ad8a0169 PortNum=0x5003 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE PathProtection=Path Unprotected Circuit ID: ad8a0165:27 Circuit Name: TRAIL-T3A_100G_SD20 Circuit Version: 0 Circuit Monitor: false Circuit Size: OCHNC-NOSPEC Circuit Type: Circuits::CARRIER_TRAIL_CIRCUIT Circuit Dir: Bidirectional Circuit SLA: 0 Circuit OchncChannel: 191350.00-32.20 [freq=19135000/dim=3220] Circuit OchncDir: 0 Circuit isGmpls: true Circuit GmplsInfo.ServiceId: ad8a0165:26 Circuit GmplsInfo.AllowedOptOperZone: 4 Circuit GmplsInfo.IsUni: false Circuit GmplsInfo.restorationMode: 0 Circuit GmplsInfo.revertiveMode: 0 Circuit GmplsInfo.revertiveSoakTime: 60 Circuit GmplsInfo.restorationStatus: 0 Circuit GmplsInfo.operZone: 3 Circuit GmplsInfo.priority: 0 Circuit GmplsInfo.circuitLabel: T3A_100G_SD20_01 Circuit GmplsInfo.downstreamPwrOffset: 0 Circuit GmplsInfo.upstreamPwrOffset: 0 Circuit GmplsInfo.allowRegens: 0 Circuit GmplsInfo.isRegenerated: 0 Circuit GmplsInfo.ochncChannels [n: 1] 0] 191350.00-32.20 [1] Circuit GmplsInfo.diversity [n: 0] Circuit GmplsInfo.wsonSignalingVersion: Circuits::WSON_VER_UPGRADED Circuit Flags: 0x0 --> numb of sources[1] Circuit Source #0: NodeId=ad8a0165 PortNum=0x5003 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE --> numb of drops[1] Circuit Drop #0: NodeId=ad8a0169 PortNum=0x5003 StsNum=0 VtNum=0 OduNum=0 memberNumber=0 DropProtection=FALSE PathProtection=Path Unprotected Circuit ID: ad8a0165:25 *Circuit Name: T3A_100G_SD20* Circuit Version: 0 Circuit Monitor: false Circuit Size: OCH-TRAIL *Circuit Type: Circuits::OCHCC_OVER_SUPER_CHANNEL_CIRCUIT* Circuit Dir: Bidirectional Circuit SLA: 0 Circuit OchncChannel: 191.35(1566_72) [freq=19135000/dim=5000] Circu
Re: RegEx to match set of lines
On Thu, 05 Apr 2018 14:09:23 +0530, Prahallad Achar wrote: > Hello, > I would like to match set of lines from the below data. this data comes > from one of the network Good grief! You don't need to post your entire data set! We don't need or want to see hundreds of lines. Cut your data down to a SMALL representative sample. Explain how it is coming to you: it looks like you are reading the data in something similar to key:value format. Is that correct? If so, you don't need a regex. This is not Perl, we have more than one tool in our toolbox and don't have to force everything to be a regex. The way I would process it would be to write a small accumulator function to group the lines into records, then a filter function to extract the records you want, and finally a function to extract the specific values you want from the record. Far more understandable and maintainable, and less fragile, than a horribly complex regex. -- Steve -- https://mail.python.org/mailman/listinfo/python-list
want to export some of the packets from a big pacp file to another file.
Hi, I am using dpkt python package to parse .pcap file and I am able to do successfully. My requirement is to filter some of the traffic from the big .pcap file and to export the result to another file. I don't know how to do this. PFB the setup details I am using. ### OS-windows 7 32 bit python->2.7.6 32 bit Highly appreciating your effort to help me. Thanks, Supriya -- https://mail.python.org/mailman/listinfo/python-list
Re: want to export some of the packets from a big pacp file to another file.
På Thu, 5 Apr 2018 08:06:10 -0700 (PDT) supsw...@gmail.com skrev: > Hi, > > I am using dpkt python package to parse .pcap file and I am able to do > successfully. > > My requirement is to filter some of the traffic from the big .pcap file > and to export the result to another file. > > I don't know how to do this. What kind of filtering do you need? In many cases it would be faster and more convenient to use wireshark or other similar tools as a pass-through filter, rather than rolling your own. -- //Wegge -- https://mail.python.org/mailman/listinfo/python-list
Re: want to export some of the packets from a big pacp file to another file.
On 2018-04-05, supsw...@gmail.com wrote: > Hi, > > I am using dpkt python package to parse .pcap file and I am able to do > successfully. > > My requirement is to filter some of the traffic from the big .pcap > file and to export the result to another file. > > I don't know how to do this. The easiest way is to use tcpdump on the command line. Let's say you've got a huge file (huge.pcap), and all you want to see is TCP traffic to/from 10.0.0.104: tcpdump -r huge.pcap -w output.pcap tcp and host 10.0.0.104 If you insist on doing it in Python, then use can use pylibpcap to read/parse the file. https://sourceforge.net/projects/pylibpcap/files/pylibpcap/ When reading the file, you can use the normal capture filters that you use with tcpdump. Once you've read the packet, you can apply your own logic if you want. I don't recall ever trying to install it on windows. It requires the pcap library, which is available for Windows. I don't recall that it has methods to write a file, so you may have to roll that bit yourself. If you want to write something from scratch, here's the file format: https://wiki.wireshark.org/Development/LibpcapFileFormat You should be able to use ctypes to directly access the winpcap library if you want to: https://www.winpcap.org/ -- Grant Edwards grant.b.edwardsYow! ! Up ahead! It's a at DONUT HUT!! gmail.com -- https://mail.python.org/mailman/listinfo/python-list
Re: RegEx to match set of lines
On 4/5/2018 11:03 AM, Steven D'Aprano wrote: On Thu, 05 Apr 2018 14:09:23 +0530, Prahallad Achar wrote: I would like to match set of lines from the below data. this data comes from one of the network Good grief! You don't need to post your entire data set! We don't need or want to see hundreds of lines. +100 Cut your data down to a SMALL representative sample. Explain how it is coming to you: it looks like you are reading the data in something similar to key:value format. Is that correct? If so, you don't need a regex. This is not Perl, we have more than one tool in our toolbox and don't have to force everything to be a regex. +10 Your bloated post will go to at least 10 archives and some unknown 1000s of people. The way I would process it would be to write a small accumulator function to group the lines into records, then a filter function to extract the records you want, and finally a function to extract the specific values you want from the record. In Python, I would write a generator to yield records (groups of lines pertaining to one circuit. It appears that each group starts with a circuid ID and ends with a blank line. Then for record in file: if wanted(record): process(record) Far more understandable and maintainable, and less fragile, than a horribly complex regex. I have done this sort of thing in C, but mixing together the code for separating, identifying, and processing records made it less transparent than the above. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: logging.FileHandler diff Py2 v Py3
> I'll poke around a little and maybe open a bug report if I can't find any > explanation for the change in behavior. Turns out to be a known problem with a bit of history: https://bugs.python.org/issue27805 Skip -- https://mail.python.org/mailman/listinfo/python-list
try-except syntax
I'm trying to simplify a try-except construct. E.g. how come
this:
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except ImportError:
pass
except RuntimeError:
pass
return ("")
Cannot be simplified into this:
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except ImportError:
except RuntimeError:
pass
return ("")
Like a "fall-through" in a C-switch statement.
--
https://mail.python.org/mailman/listinfo/python-list
Re: try-except syntax
On 04/05/2018 02:04 PM, ElChino wrote:
I'm trying to simplify a try-except construct. E.g. how come
this:
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except ImportError:
pass
except RuntimeError:
pass
return ("")
Cannot be simplified into this:
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except ImportError:
except RuntimeError:
pass
return ("")
Like a "fall-through" in a C-switch statement.
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except (ImportError, RuntimeError):
pass
return ("")
That handles the identical case. C-style fall-throughs where you have
one switch have just a bit of code before the fall-through kicks in (the
slightly non-identical case) is often the source of disastrous code errors.
--
Rob Gaddi, Highland Technology -- www.highlandtechnology.com
Email address domain is currently out of order. See above to fix.
--
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Re: try-except syntax
On Thu, Apr 5, 2018 at 3:04 PM, ElChino wrote:
> I'm trying to simplify a try-except construct. E.g. how come
> this:
> try:
> _x, pathname, _y = imp.find_module (mod, mod_path)
> return ("%s" % pathname)
> except ImportError:
> pass
> except RuntimeError:
> pass
> return ("")
>
> Cannot be simplified into this:
> try:
> _x, pathname, _y = imp.find_module (mod, mod_path)
> return ("%s" % pathname)
> except ImportError:
> except RuntimeError:
> pass
> return ("")
>
> Like a "fall-through" in a C-switch statement.
You're looking for:
try:
_x, pathname, _y = imp.find_module (mod, mod_path)
return ("%s" % pathname)
except (ImportError, RuntimeError):
return ("")
--
https://mail.python.org/mailman/listinfo/python-list
Re: try-except syntax
ElChino writes:
> I'm trying to simplify a try-except construct. E.g. how come
> this:
> try:
> _x, pathname, _y = imp.find_module (mod, mod_path)
> return ("%s" % pathname)
> except ImportError:
> pass
> except RuntimeError:
> pass
> return ("")
>
> Cannot be simplified into this:
> try:
> _x, pathname, _y = imp.find_module (mod, mod_path)
> return ("%s" % pathname)
> except ImportError:
> except RuntimeError:
> pass
> return ("")
>
> Like a "fall-through" in a C-switch statement.
The except parts don't fall through, and each one needs a "suite".
Also, the "pass" before the return is mysterious which makes me think
there's an indent error in what you posted.
Anyway, to coalesce two or more exception handlers, you are probably
looking for
except (ImportError, RuntimeError):
which matches both.
--
Ben.
--
https://mail.python.org/mailman/listinfo/python-list
Re: try-except syntax
Ben Bacarisse wrote: Anyway, to coalesce two or more exception handlers, you are probably looking for except (ImportError, RuntimeError): To the OP: Are you sure you really want to mask RuntimeError here? Usually it means something has gone seriously wrong, and is a symptom that shouldn't be ignored. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
install MySQL-python failed ....
$ python -m pip install MySQL-python Collecting MySQL-python Downloading MySQL-python-1.2.5.zip (108kB) 100% || 112kB 260kB/s 930 [main] python2.7 12948 child_info_fork::abort: address space needed by 'datetime.dll' (0x87) is already occupied Error [Errno 11] Resource temporarily unavailable while executing command python setup.py egg_info Exception: Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 324, in run requirement_set.prepare_files(finder) File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 380, in prepare_files ignore_dependencies=self.ignore_dependencies)) File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 634, in _prepare_file abstract_dist.prep_for_dist() File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 129, in prep_for_dist self.req_to_install.run_egg_info() File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 439, in run_egg_info command_desc='python setup.py egg_info') File "/usr/lib/python2.7/site-packages/pip/utils/__init__.py", line 667, in call_subprocess cwd=cwd, env=env) File "/usr/lib/python2.7/subprocess.py", line 390, in __init__ errread, errwrite) File "/usr/lib/python2.7/subprocess.py", line 917, in _execute_child self.pid = os.fork() OSError: [Errno 11] Resource temporarily unavailable anything hit similar issue? -- https://mail.python.org/mailman/listinfo/python-list
Re: install MySQL-python failed ....
On Thu, Apr 5, 2018 at 7:12 PM, yi zhao wrote: > $ python -m pip install MySQL-python > Collecting MySQL-python > Downloading MySQL-python-1.2.5.zip (108kB) > 100% || 112kB 260kB/s > 930 [main] python2.7 12948 child_info_fork::abort: address space needed > by 'datetime.dll' (0x87) is already occupied > Error [Errno 11] Resource temporarily unavailable while executing command > python setup.py egg_info > Exception: > Traceback (most recent call last): > File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 215, in > main > status = self.run(options, args) > File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 324, > in run > requirement_set.prepare_files(finder) > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 380, in > prepare_files > ignore_dependencies=self.ignore_dependencies)) > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 634, in > _prepare_file > abstract_dist.prep_for_dist() > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 129, in > prep_for_dist > self.req_to_install.run_egg_info() > File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 439, > in run_egg_info > command_desc='python setup.py egg_info') > File "/usr/lib/python2.7/site-packages/pip/utils/__init__.py", line 667, in > call_subprocess > cwd=cwd, env=env) > File "/usr/lib/python2.7/subprocess.py", line 390, in __init__ > errread, errwrite) > File "/usr/lib/python2.7/subprocess.py", line 917, in _execute_child > self.pid = os.fork() > OSError: [Errno 11] Resource temporarily unavailable > > > anything hit similar issue? Is this happening in cygwin? Or in a native linux? -- https://mail.python.org/mailman/listinfo/python-list
Re: install MySQL-python failed ....
https://stackoverflow.com/questions/11107155/how-to-fix-address-space-is-already-occupied-error-on-fetch-commit On Fri, Apr 6, 2018 at 8:12 AM, yi zhao wrote: > $ python -m pip install MySQL-python > Collecting MySQL-python > Downloading MySQL-python-1.2.5.zip (108kB) > 100% || 112kB 260kB/s > 930 [main] python2.7 12948 child_info_fork::abort: address space needed > by 'datetime.dll' (0x87) is already occupied > Error [Errno 11] Resource temporarily unavailable while executing command > python setup.py egg_info > Exception: > Traceback (most recent call last): > File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 215, in > main > status = self.run(options, args) > File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 324, > in run > requirement_set.prepare_files(finder) > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 380, in > prepare_files > ignore_dependencies=self.ignore_dependencies)) > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 634, in > _prepare_file > abstract_dist.prep_for_dist() > File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 129, in > prep_for_dist > self.req_to_install.run_egg_info() > File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 439, > in run_egg_info > command_desc='python setup.py egg_info') > File "/usr/lib/python2.7/site-packages/pip/utils/__init__.py", line 667, in > call_subprocess > cwd=cwd, env=env) > File "/usr/lib/python2.7/subprocess.py", line 390, in __init__ > errread, errwrite) > File "/usr/lib/python2.7/subprocess.py", line 917, in _execute_child > self.pid = os.fork() > OSError: [Errno 11] Resource temporarily unavailable > > > anything hit similar issue? > -- > https://mail.python.org/mailman/listinfo/python-list -- INADA Naoki -- https://mail.python.org/mailman/listinfo/python-list
Re: try-except syntax
On Thu, 05 Apr 2018 23:04:18 +0200, ElChino wrote:
> I'm trying to simplify a try-except construct. E.g. how come this:
>try:
> _x, pathname, _y = imp.find_module (mod, mod_path)
> return ("%s" % pathname)
imp.find_module is deprecated and should not be used in new code.
Putting that aside, pathname is already a string. Why are you wasting
time interpolating it into a bare "%s" string? Just say `return pathname`.
>except ImportError:
> pass
>except RuntimeError:
> pass
> return ("")
Unnecessary parens surrounding a single value.
Possible indentation error. Surely the return "" needs to be
indented level with the try/except statements?
> Cannot be simplified into this:
>try:
> _x, pathname, _y = imp.find_module (mod, mod_path) return ("%s" %
> pathname)
>except ImportError:
>except RuntimeError:
> pass
> return ("")
>
> Like a "fall-through" in a C-switch statement.
Because fall-through C switch syntax is an abomination, and fortunately
the designer of Python has more sense than to allow that awfulness.
The syntax you are looking for is:
try:
block
except (ImportError, RuntimeError):
block
By the way, RuntimeError is almost never something you want to catch
(except to log before bailing out). It should represent a fatal coding
error, not something safe to ignore.
--
Steve
--
https://mail.python.org/mailman/listinfo/python-list
Re: # of Months between two dates
> > > > I've written a function to return the months between date1 and date2 > but > > > I'd like to know if anyone is aware of anything in the standard library > > > to do the same? For bonus points, does anyone know if postgres can do > > > the same (we use a lot of date/time funcitons in postgres, already, but > > > didn't see this problem addressed). > > > It's probably better to write the function yourself according to what > > makes sense in your use-case, and document its behaviour clearly. > I suggest using the dateutil module ( https://pypi.python.org/pypi/python-dateutil) before writing your own. -- https://mail.python.org/mailman/listinfo/python-list
Re: # of Months between two dates
On Thu, 05 Apr 2018 22:03:07 -0600, Jason Friedman wrote: >> > > I've written a function to return the months between date1 and >> > > date2 >> but >> > > I'd like to know if anyone is aware of anything in the standard >> > > library to do the same? For bonus points, does anyone know if >> > > postgres can do the same (we use a lot of date/time funcitons in >> > > postgres, already, but didn't see this problem addressed). >> >> > >> > It's probably better to write the function yourself according to what >> > makes sense in your use-case, and document its behaviour clearly. >> >> > I suggest using the dateutil module ( > https://pypi.python.org/pypi/python-dateutil) before writing your own. I'm not seeing a "months between" function in dateutil. Have I missed something? The question of how many months are between two dates is hard to answer. For example: - between Jan 1 and Feb 1 is clearly one month (31 days); - unless you think all months should be 30 days, in which case its one month and one day; - giving one month from Jan 1 as Jan 31, which seems weird; - either way, the period between Feb 1 and Mar 1 is only four weeks and so obviously less than one month; - unless you think a month is four weeks precisely; - in which case it is one month between Jan 1 and Jan 29; - one month forward from Jun 30 is clearly Jul 30; - but one month back from Jul 31 is either Jun 30 or Jul 1; - instead of counting days, with all the difficulty that causes, we could just count how many times the month changes; - in which case, Jan 31 to Feb 1 is one month. I wish the calendar designers had made the year 13 months of exactly 4 weeks each, with one intercalary day left over (two in leap years). Half a year becomes exactly 6 months and two weeks; a quarter of a year becomes three months and one week. A third is a bit more than four weeks. Date calculations would be much simpler, with only one (or two in leap years) special case, the intercalary day, instead of 36. -- Steve -- https://mail.python.org/mailman/listinfo/python-list
