Syntax question
Hi, the other day I came across the book "Classic Computer Science Problems in Python" by David Kopec. The function definitions in the examples like = def fib2(n: int) -> int: if n < 2: # base case return n return fib2(n - 2) + fib2(n - 1) # recursive case if __name__ == "__main__": print(fib2(5)) print(fib2(10)) = use a syntax that I have never seen on this list or in other publications. My questions: Is that new? Is is 'recommended' to use this is the future? I can only see a certain advantage of using this type of function definition in resp. to the documentation, as it does not provide an automatic check of the type of the argument(s) or of the result as in Java. -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
[SOLVED] Re: Installing Python 3.8.3 with tkinter
On 7/22/20 12:20 PM, Klaus Jantzen wrote: Hi, Trying to install Python 3.8.3 with tkinter I run configure with the following options ./configure --enable-optimizations --with-ssl-default-suites=openssl --with-openssl=/usr/local --enable-loadable-sqlite-extensions --with-pydebug --with-tcltk-libs='-L/opt/ActiveTcl-8.6/lib/tcl8.6' --with-tcltk-includes='-I/opt/ActiveTcl-8.6/include' Running Python gives the following information Python 3.8.3 (default, Jul 22 2020, 11:52:15) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 >>> import tkinter Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.8/tkinter/__init__.py", line 36, in import _tkinter # If this fails your Python may not be configured for Tk ModuleNotFoundError: No module named '_tkinter' >>> Obviously there is something wrong with my configure options. How do that correctly? Thanks for any help. K.D.J. In my post I forgot to mention that I am running PY under Debian Buster. As suggested by Ned Deily I switched to PY 3.8.5 After some more research in the internet I found that the tcl/tk libraries have automaticalle been installed during the Buster installation. For automatically including tkinter during the PY installation one needs also the 'tk-dev toolkit'. With that I did not need the options '--with-tcltk-libs'/'--with-tcltk-includes' After the installation of PY 3.8.5 I can import tkinter. Thank you very much for your replies. K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Re: Installing Python 3.8.3 with tkinter
On 7/22/20 11:05 PM, Ned Deily wrote: On 2020-07-22 06:20, Klaus Jantzen wrote: Trying to install Python 3.8.3 with tkinter I run configure with the following options ./configure --enable-optimizations --with-ssl-default-suites=openssl --with-openssl=/usr/local --enable-loadable-sqlite-extensions --with-pydebug --with-tcltk-libs='-L/opt/ActiveTcl-8.6/lib/tcl8.6' --with-tcltk-includes='-I/opt/ActiveTcl-8.6/include' Running Python gives the following information [...] How do that correctly? Try --with-tcltk-libs='-L/opt/ActiveTcl-8.6/lib -ltcl8.6 -ltk8.6' Thank you for your suggestion; unfortunately it did not help. -- https://mail.python.org/mailman/listinfo/python-list
Installing Python 3.8.3 with tkinter
Hi, Trying to install Python 3.8.3 with tkinter I run configure with the following options ./configure --enable-optimizations --with-ssl-default-suites=openssl --with-openssl=/usr/local --enable-loadable-sqlite-extensions --with-pydebug --with-tcltk-libs='-L/opt/ActiveTcl-8.6/lib/tcl8.6' --with-tcltk-includes='-I/opt/ActiveTcl-8.6/include' Running Python gives the following information Python 3.8.3 (default, Jul 22 2020, 11:52:15) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 >>> import tkinter Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.8/tkinter/__init__.py", line 36, in import _tkinter # If this fails your Python may not be configured for Tk ModuleNotFoundError: No module named '_tkinter' >>> Obviously there is something wrong with my configure options. How do that correctly? Thanks for any help. K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Py 3.6 tarfile
Hi,
if I understand the documentation of the tarfile module correctly writing
TarfileObject.add(".../path/to/filename", recursive=False)
means that the directory structure of the file object will not be included
in the archive.
In the following script only "testtext1.pdf" is stored outside a directory
structure. The other files are always stored in a directory structure;
using recursive=False does not have any effect.
#!/usr/bin/env python3
#
import argparse
import sys
import tarfile
import os
arch = "Archive.tgz"
os.unlink(arch)
try:
TO = tarfile.open(name=arch, mode='x:gz') # Tarfile object
TO.add("testtext1.pdf")
TO.add("./testtext2.pdf")
TO.add("./testtext3.pdf", recursive=False)
TO.add("./files/testtext4.pdf")
TO.add("./files/testtext5.pdf", recursive=False)
TO.close()
except FileExistsError as err:
pass
=
Is my understanding correct or what do have to do so that the files are
stored without any directory information?
Thanks for any hints.
--
K.D.J.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Recompilation of Python3.6.x
On 03/23/2017 12:23 AM, Jon Ribbens wrote: On 2017-03-22, Grant Edwards wrote: On 2017-03-22, Thomas Nyberg wrote: On 03/22/2017 03:22 PM, Jon Ribbens wrote: A simple table with a list of the library names, the debian package names, and the rpm names would provide the information in a way that would be useful to everyone. A _simple_ table would be useful. However, a _simple_ table is not possible. I definitely agree, but it would be kind of difficult to maintain. I mean if you supported debian and redhat (should others be considered?), And you would need table for each _version_ of each distribution (libraries sometimes get combined/renamed/split). Not really, that's why I suggested one of the fields in the table would be the standard library name - people should always be able to use that to find the appropriate package for their distribution (if there is one, otherwise they'll need to compile from source). And you would need tables showing which libraires are required for which Python features: tkinter is optional, crypto is optional (or at least used to be), etc. That's a good idea - that would make the simple table have 4 columns: name, deb, rpm, python module (or "essential"). The information must be somewhere because Python must have been compiled frequently and correctly for the various (important) OSs before making it available to the public. And I do not think that it is left up to "your luck" that the required packages and libraries are present. -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Re: Recompilation of Python3.6.x
On 03/22/2017 06:34 PM, Thomas Nyberg wrote: On 03/22/2017 12:42 PM, Klaus Jantzen wrote: Hello, in order to have the Python-SQLite support available one has to recompile Python. For the recompiliation to succeed a number of 'modules/libs' have to be present. In the internet I found the following list build-essential libz-dev libreadline-dev libncursesw5-dev libssl-dev libgdbm-dev libsqlite3-dev libbz2-dev liblzma-dev tk-dev libdb-dev libc6-dev zlib After having installed these 'modules/libs' I recompiled Python3.6.1 and although the steps 'make', 'make test', and 'make install' produced some errors the sqlite3-support is available. My question: Is this list complete or are there superfluous items? My suggestion: Couldn't such a list be provided in the README file? If you're using Ubuntu/debian, you could use `sudo apt-get build-dep python3.5` (might need another version depending upon what you have in your package manager). What that does is install the packages required to build the debian packages. Unless any new libraries are needed for 3.6, you should be good. I did not know somenthing like this exists. I can't speak for the maintainers, but I don't think that providing such a list is super reasonable considering that there are many different OSs which have sometimes have slightly different library package names (though of course one could argue that Ubuntu/debian helps a lot of people). Cheers, Thomas With the above my suggestion is superfluous. Thanks a lot for the information. -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Recompilation of Python3.6.x
Hello, in order to have the Python-SQLite support available one has to recompile Python. For the recompiliation to succeed a number of 'modules/libs' have to be present. In the internet I found the following list build-essential libz-dev libreadline-dev libncursesw5-dev libssl-dev libgdbm-dev libsqlite3-dev libbz2-dev liblzma-dev tk-dev libdb-dev libc6-dev zlib After having installed these 'modules/libs' I recompiled Python3.6.1 and although the steps 'make', 'make test', and 'make install' produced some errors the sqlite3-support is available. My question: Is this list complete or are there superfluous items? My suggestion: Couldn't such a list be provided in the README file? -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Re: SQLite
On 02/22/2016 09:32 AM, Klaus Jantzen wrote: On 02/21/2016 10:37 PM, Albert-Jan Roskam wrote: (Sorry for top posting) IIRC, you have to do sudo apt-get install build-essential python-dev ... then re-compile python > To: [[1]1]python-list@python.org > From: [[2]2]k.d.jant...@mailbox.org > Subject: SQLite > Date: Sun, 21 Feb 2016 18:11:18 +0100 > > Hello, > > I have downloaded Python3.5.1 as .targz, compiled it(configure, make,...) > and it works > (under Debian Wheezy AMD64) up to the moment I wanted to use SQLite. > > I get the following message: > === > jantzen@PC4:~$ python > Python 3.5.0 (default, Dec 2 2015, 14:16:16) > [GCC 4.7.2] on linux > Type "help", "copyright", "credits" or "license" for more information. > >>> import sqlite3 > Traceback (most recent call last): > File "", line 1, in > File "/usr/local/lib/python3.5/sqlite3/__init__.py", line 23, in > > from sqlite3.dbapi2 import * > File "/usr/local/lib/python3.5/sqlite3/dbapi2.py", line 27, in > from _sqlite3 import * > ImportError: No module named '_sqlite3' > === > > Obviously something is missing. > How do I solve the problem? Where do I find this module? > > Thanks for a hint. > -- > > K.D.J. > -- > [3][3]https://mail.python.org/mailman/listinfo/python-list Hello, thanks for your hint. That did it!!! At least on one machine!!! -- K.D.J. References Visible links 1. [4]mailto:python-list@python.org 2. [5]mailto:k.d.jant...@mailbox.org 3. [6]https://mail.python.org/mailman/listinfo/python-list On the second machine (DELL E6530) I have everything in the installation directory (the expansion of the tarball): sqlite directory with all the modules. I ran the apt-get install as suggested above. I ran './configure --enable-loadable-sqlite-extensions' and find the appropriate entry in the configure.log. I ran 'make' and find the configure option in the Makefile. But when running 'make test' the sqlite test fails with 'no _sqlite3 module' Any helpful ideas? Thanks. -- K.D.J. References Visible links 1. mailto:1]python-list@python.org 2. mailto:2]k.d.jant...@mailbox.org 3. https://mail.python.org/mailman/listinfo/python-list 4. mailto:python-list@python.org 5. mailto:k.d.jant...@mailbox.org 6. https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: SQLite
On 02/22/2016 02:44 AM, Chris Angelico wrote: On Mon, Feb 22, 2016 at 8:37 AM, Albert-Jan Roskam [1] wrote: IIRC, you have to do sudo apt-get install build-essential python-dev ... then re-compile python That may well work, but it's probably easier to work this way: sudo apt-get build-dep python3 That should grab all the compilation dependencies of the python3 package, which on Wheezy is a 3.2 IIRC. The deps haven't changed since then AFAIK. When you build, you should get a summary at the end that tells you about any modules that couldn't be built. The most common reason for that is missing deps. If you still have any after running the above, post here and we may be able to more directly advise. ChrisA That did not work because I did not install Python 3.5. with apt-get but downloaded the source and compiled myself. Thus apt-get does not have any information about the Python 3.5 installation. I got it to work following the hint by Albert-Jan Roskam. -- K.D.J. References Visible links 1. mailto:sjeik_ap...@hotmail.com -- https://mail.python.org/mailman/listinfo/python-list
Re: SQLite
On 02/21/2016 10:37 PM, Albert-Jan Roskam wrote: (Sorry for top posting) IIRC, you have to do sudo apt-get install build-essential python-dev ... then re-compile python > To: [1]python-list@python.org > From: [2]k.d.jant...@mailbox.org > Subject: SQLite > Date: Sun, 21 Feb 2016 18:11:18 +0100 > > Hello, > > I have downloaded Python3.5.1 as .targz, compiled it(configure, make,...) > and it works > (under Debian Wheezy AMD64) up to the moment I wanted to use SQLite. > > I get the following message: > === > jantzen@PC4:~$ python > Python 3.5.0 (default, Dec 2 2015, 14:16:16) > [GCC 4.7.2] on linux > Type "help", "copyright", "credits" or "license" for more information. > >>> import sqlite3 > Traceback (most recent call last): > File "", line 1, in > File "/usr/local/lib/python3.5/sqlite3/__init__.py", line 23, in > > from sqlite3.dbapi2 import * > File "/usr/local/lib/python3.5/sqlite3/dbapi2.py", line 27, in > from _sqlite3 import * > ImportError: No module named '_sqlite3' > === > > Obviously something is missing. > How do I solve the problem? Where do I find this module? > > Thanks for a hint. > -- > > K.D.J. > -- > [3]https://mail.python.org/mailman/listinfo/python-list Hello, thanks for your hint. That did it!!! -- K.D.J. References Visible links 1. mailto:python-list@python.org 2. mailto:k.d.jant...@mailbox.org 3. https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
SQLite
Hello, I have downloaded Python3.5.1 as .targz, compiled it(configure, make,...) and it works (under Debian Wheezy AMD64) up to the moment I wanted to use SQLite. I get the following message: === jantzen@PC4:~$ python Python 3.5.0 (default, Dec 2 2015, 14:16:16) [GCC 4.7.2] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.5/sqlite3/__init__.py", line 23, in from sqlite3.dbapi2 import * File "/usr/local/lib/python3.5/sqlite3/dbapi2.py", line 27, in from _sqlite3 import * ImportError: No module named '_sqlite3' === Obviously something is missing. How do I solve the problem? Where do I find this module? Thanks for a hint. -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
