🌐 Mailman 3 May 2023 - Python-list - python.org

>>> %matplotlib inline results in SyntaxError: invalid syntax
by Mike S Dec. 25, 2023

Dec. 25, 2023

I have installed Python 3.4.4 on XPSP3 and am trying to work my way through this tutorial. A Complete Tutorial on Ridge and Lasso Regression in Python http://www.analyticsvidhya.com/blog/2016/01/complete-tutorial-ridge-lasso-r… In Step 2 "Why Penalize the Magnitude of Coefficients?" we are shown this code: #Importing libraries. The same will be used throughout the article. import numpy as np import pandas as pd import random import matplotlib.pyplot as plt %matplotlib inline I get an error on the last line. I am running this code in Idle Python 3.4.4 Shell... Python 3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 19:28:18) [MSC v.1600 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> import numpy as np >>> import pandas as pd >>> import random >>> import matplotlib.pyplot as plt >>> %matplotlib inline SyntaxError: invalid syntax What am I doing wrong? Suggested reading? TIA, Mike

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Re: How to add CC and BCC while sending mails using python
by akegb3＠gmail.com June 20, 2023

June 20, 2023

On Tuesday, September 30, 2008 8:00:16 AM UTC-8, Bernhard Walle wrote: > Hi, > > * cindy jones [2008-09-30 19:57]: > > > > Can someone tel me how to add cc's and bcc's while sending mails using > > python > > Following (tested) snippet should help: > > ------------------ 8< ------------------------------ > from smtplib import SMTP > from email.mime.image import MIMEImage > from email.mime.text import MIMEText > from email.mime.multipart import MIMEMultipart > > to = 'to_address(a)example.invalid' > cc = 'cc_address(a)example.invalid' > bcc = 'bcc_address(a)example.invalid' > > msg = MIMEMultipart() > msg['To'] = to > msg['Cc'] = cc > msg['From'] = 'bernhard(a)bwalle.de' > msg['Subject'] = 'Test' > text = MIMEText('Das ist ein Test') > text.add_header("Content-Disposition", "inline") > msg.attach(text) > > s = SMTP('test.smtp.relay') > s.sendmail(msg['From'], [to, cc, bcc], msg.as_string()) > s.quit() > ------------------ >8 ------------------------------ > > > Regards, > Bernhard Hello Bernhard, I've tried the above code and the bcc address does not receive the message, on the To & CC addresses receive it. Here are snippets from my code, perhaps something will stand out to you? to = 'ed(a)domain.gov' cc = 'ed(a)gmailmail.com' bcc = 'ed(a)home.net' msg = MIMEMultipart() msg['To'] = to msg['Cc'] = cc msg['Subject'] = 'My Subject text here' msg['From'] = 'edsboss(a)domain.gov' smtp = SMTP("smtpserver") smtp.ehlo() smtp.sendmail(msg['From'], [to, cc, bcc], msg.as_string()) Thanks in advance..hope you're still out there!! ~Ed

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Addition of a .= operator
by Alex Jando June 9, 2023

June 9, 2023

I have many times had situations where I had a variable of a certain type, all I cared about it was one of it's methods. For example: ------------------------------------------------------------ import hashlib hash = hashlib.sha256(b'word') hash = hash.hexdigest() ------------------------------------------------------------ import enum class Number(enum.Enum): One: int = 1 Two: int = 2 Three: int = 3 num = Number.One num = num.value ------------------------------------------------------------ Now to be fair, in the two situations above, I could just access the method right as I declare the object, however, sometimes when passing values into functions, it's a lot messier to do that. So what I'm suggesting is something like this: ------------------------------------------------------------ import hashlib hash = hashlib.sha256(b'word') hash.=hexdigest() ------------------------------------------------------------ import enum class Number(enum.Enum): One: int = 1 Two: int = 2 Three: int = 3 num = Number.One num.=value ------------------------------------------------------------

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Re: Is there a Python module to parse a date like the 'date' command in Linux?
by Chris Green June 1, 2023

June 1, 2023

Mike Dewhirst <miked(a)dewhirst.com.au> wrote: > [-- multipart/mixed, encoding 7bit, 22 lines --] > > [-- text/plain, encoding base64, charset: UTF-8, 16 lines --] > > On 21/05/2023 5:53 am, Chris Green wrote: > > I'm converting a bash script to python as it has become rather clumsy > > in bash. > > What is the use case? > A script I use to create diary entries, so it's very handy to be able to give the date as 'yesterday' or 'friday'. -- Chris Green ·

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Best practice for database connection
by Jason Friedman June 1, 2023

June 1, 2023

I'm trying to reconcile two best practices which seem to conflict. 1) Use a _with_ clause when connecting to a database so the connection is closed in case of premature exit. class_name = 'oracle.jdbc.OracleDriver' url = f"jdbc:oracle:thin:@//{host_name}:{port_number}/{database_name}" with jdbc.connect(class_name, url, [user_name, password], jdbc_jar_file.as_posix()) as connection: logger.info(f"Connected.") 2) Use self-made functions to streamline code. For example, there are several places I need to know if the database object is a particular type, so I create a function like this: foobar_set = set() ... def is_foobar(connection: jdbc.Connection, name: str) -> bool: """ :param connection: connection object :param name: owner.object :return: True if this object is of type foobar """ global foobar_set if not foobar_set: query = f"""select stuff from stuff""" cursor = connection.cursor() cursor.execute(query) for owner, object_name in cursor.fetchall(): foobar_set.add(f"{owner}.{object_name}") cursor.close() return name.upper() in foobar_set But that requires that I call is_foobar() with a connection object. Essentially I'd like a function that leverages the one connection I create at the beginning using a with clause.

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Re: Why does IDLE use a subprocess?
by Greg Ewing June 1, 2023

June 1, 2023

On 29/05/23 8:10 am, James Schaffler wrote: > However, some minimal testing of InteractiveInterpreter leads me to believe that the Interpreter object has its own view of local/global variables and therefore shouldn't be able to affect the calling interpreter Globals you create by executing code in the REPL have their own namespace. But everything else is shared -- builtins, imported Python modules, imported C extension modules, etc. etc. There's a long-running project to make it possible to have multiple fully-isolated Python interpreters in one process, but the way CPython is structured makes that very difficult to achieve, and as far as I know it's not there yet. In the case of IDLE, there's really no reason not to use a subprocess[1]. It's easy and guarantees 100% isolation. [1] Well, mostly. There used to be a small hitch on Windows with the default firewall settings not letting you connect to a local socket (nice one, Microsoft). I don't know whether that's still an issue. -- Greg

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Log File
by ahsan iqbal May 31, 2023

May 31, 2023

Why we need a log file ? If i read a large text file than how log file help me in this regard?

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Re: Fwd: Problems Installing and getting started.
by Dennis Lee Bieber May 31, 2023

May 31, 2023

On Wed, 31 May 2023 08:34:48 +0100, Mark Bass <markbass649(a)gmail.com> declaimed the following: >---------- Forwarded message --------- >From: Mark Bass <markbass649(a)gmail.com> >Date: Wed, 31 May 2023 at 08:09 >Subject: Problems Installing and getting started. >To: <python-list(a)python.org> > > >Good morning, > >I installed python several hours ago (from python.org), I then installed >the IDE PyCharm. I'm using AI to help with a project that requires >statistical analysis. >I cannot open python, when I double clicked a "Modify Setup" window >appeared with the three options Modify, Repair and Uninstall to click. I >assumed this was part of the final installation process and clicked Modify >- it seemed to be successful. I still could not open python. I asked the AI >and it suggested to click Repair, this still made no difference. I finally >Uninstalled it, shut down my laptop, had a coffee then re-installed it but >the same problem occurred. >Can you help ? Any suggestions? >I'm really pleased with the AI so far and looking forward to using Python >to get my project started. >Best Regards.....Mark You are RERUNNING the Python installer package. Once you installed Python -- move that installer package to some safe/obscure location on your computer (you should only need it if you really need to fix an error with the installation). Python does not provide, normally, a "click me" icon to run Python. Python is a command line language INTERPRETER/COMPILER. If file associations are set up, clicking on a script (.py) file /will/ run it -- but the window it opens goes away as soon as the script completes. Instead one opens a command shell window and runs Python/scripts from that window... Microsoft Windows [Version 10.0.19045.2965] (c) Microsoft Corporation. All rights reserved. C:\Users\Owner>python Python 3.10.11 (tags/v3.10.11:7d4cc5a, Apr 5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> C:\Users\Owner>dir *.py Volume in drive C is Sys_OS Volume Serial Number is B650-6F92 Directory of C:\Users\Owner 04/15/2023 04:57 PM 50 junk.py 1 File(s) 50 bytes 0 Dir(s) 1,884,894,617,600 bytes free C:\Users\Owner>python junk.py 2 4 6 8 10 12 C:\Users\Owner>junk.py 2 4 6 8 10 12 C:\Users\Owner> Note: depending upon your environment, neither file associates nor Python may be set up on the path. You may have a "py" command that is set up to find and run Python (and allow specifying which version if you have multiple versions (in different directories). Also, you may be affected by whether Python was installed for "all users" or just the account that did the install.

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Fwd: Problems Installing and getting started.
by Mark Bass May 31, 2023

May 31, 2023

---------- Forwarded message --------- From: Mark Bass <markbass649(a)gmail.com> Date: Wed, 31 May 2023 at 08:09 Subject: Problems Installing and getting started. To: <python-list(a)python.org> Good morning, I installed python several hours ago (from python.org), I then installed the IDE PyCharm. I'm using AI to help with a project that requires statistical analysis. I cannot open python, when I double clicked a "Modify Setup" window appeared with the three options Modify, Repair and Uninstall to click. I assumed this was part of the final installation process and clicked Modify - it seemed to be successful. I still could not open python. I asked the AI and it suggested to click Repair, this still made no difference. I finally Uninstalled it, shut down my laptop, had a coffee then re-installed it but the same problem occurred. Can you help ? Any suggestions? I'm really pleased with the AI so far and looking forward to using Python to get my project started. Best Regards.....Mark

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Resolution of paths in tracebacks
by Vishal Chandratreya May 31, 2023

May 31, 2023

When an exception occurs, the full path to the file from which it originates is displayed, but redundant elements are not removed. For instance: $ ./python ./foo Traceback (most recent call last): File "/home/User/cpython/./foo", line 4, in <module> a() File "/home/User/cpython/./foo", line 3, in a def a(): raise ValueError ValueError This happens because the function _Py_abspath (in Python/fileutils.c) appends relative_path_to_file to absolute_path_to_current_working_directory. Not sure if this should be treated as a bug, because the definition of 'absolute path' is not clear. Does it mean a path starting from the root directory, or a path without redundant elements? The os module, for instance, does the following. $ ./python >>> import os.path >>> os.path.isabs('/home/..') True >>> os.path.abspath('/home/..') '/' Either way: should the traceback display the path without redundant elements? I am using CPython 3.13.0a0 (595ffddb33e95d8fa11999ddb873d08e3565d2eb).

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