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The Lounge What is on Your Mind? PI calculated by hand. If this doesn't blow your mind nothing will. Post 303014724 by wisecracker on Monday 19th of March 2018 02:09:47 PM
Old 03-19-2018
Hi...
(Apologies for any typos.)
I decided to try the Python code supplied in the wiki URL...
No alteration to the code, Python 2.7.10 - OSX default, and Python 3.5.2 on the same machine, both are old.
OSX 10.13.3, default bash terminal:
Code:
Last login: Mon Mar 19 13:26:13 on ttys000
AMIGA:amiga~> cd Desktop/Code/Python
AMIGA:amiga~/Desktop/Code/Python> python2.7 chudnovsky_pi.py
PI(maxK=70 iterations, gc().prec=1008, disp=80 digits) =
3.141592653589793238462643383279502884197169399375105820974944592307816406286208

For greater precision and more digits (takes a few extra seconds) - Try
Pi = PI(317,4501,4500)
Pi = PI(353,5022,5020)
AMIGA:amiga~/Desktop/Code/Python> python3.5 chudnovsky_pi.py
PI(maxK=70 iterations, gc().prec=1008, disp=80 digits) =
3.141592653589793238462643383279502884197169399375105820974944592307816406816734

For greater precision and more digits (takes a few extra seconds) - Try
Pi = PI(317,4501,4500)
Pi = PI(353,5022,5020)
AMIGA:amiga~/Desktop/Code/Python> _

Note the last 6 digits!
I have no idea why they should be different.
Is this a bug or just a limitation of version 2.7.x, assuming 3.5.x is correct?
Although I think Python 2.7.x is being dropped in 2020 so subtleties like this are being ignored?
 

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DH_PYTHON(1)							     Debhelper							      DH_PYTHON(1)

NAME
dh_python - calculates Python dependencies and adds postinst and prerm Python scripts (deprecated) SYNOPSIS
dh_python [debhelperoptions] [-n] [-V version] [moduledirs...] DESCRIPTION
Note: This program is deprecated. You should use dh_pysupport or dh_pycentral instead. This program will do nothing if debian/pycompat or a Python-Version control file field exists. dh_python is a debhelper program that is responsible for generating the ${python:Depends} substitutions and adding them to substvars files. It will also add a postinst and a prerm script if required. The program will look at Python scripts and modules in your package, and will use this information to generate a dependency on python, with the current major version, or on pythonX.Y if your scripts or modules need a specific python version. The dependency will be substituted into your package's control file wherever you place the token ${python:Depends}. If some modules need to be byte-compiled at install time, appropriate postinst and prerm scripts will be generated. If already byte- compiled modules are found, they are removed. If you use this program, your package should build-depend on python. OPTIONS
module dirs If your package installs Python modules in non-standard directories, you can make dh_python check those directories by passing their names on the command line. By default, it will check /usr/lib/site-python, /usr/lib/$PACKAGE, /usr/share/$PACKAGE, /usr/lib/games/$PACKAGE, /usr/share/games/$PACKAGE and /usr/lib/python?.?/site-packages. Note: only /usr/lib/site-python, /usr/lib/python?.?/site-packages and the extra names on the command line are searched for binary (.so) modules. -V version If the .py files your package ships are meant to be used by a specific pythonX.Y version, you can use this option to specify the desired version, such as 2.3. Do not use if you ship modules in /usr/lib/site-python. -n, --noscripts Do not modify postinst/prerm scripts. CONFORMS TO
Debian policy, version 3.5.7 Python policy, version 0.3.7 SEE ALSO
debhelper(7) This program is a part of debhelper. AUTHOR
Josselin Mouette <joss@debian.org> most ideas stolen from Brendan O'Dea <bod@debian.org> 8.9.0ubuntu2.1 2012-06-12 DH_PYTHON(1)
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