Re: [Tutor] Plotting with python
On 31 October 2015 at 00:00, Terry Carroll wrote:
> If you were going to get started doing some simple plotting with Python 2.7
> (in my case, I'm simply plotting temperature against time-of-day) what would
> you use?
>
> - matplotlib [1]
> - gnuplot [2]
> - something else entirely?
I'd use matplotlib.
> Assume no substantial familiarity with the underlying plotting software, let
> alone the Python bindings.
>
> The only thing I can think of that might be special is to specify the
> upper/lower bounds of the plot; for example, in my case, I know the
> temperatures vary between somewhere around 70-78 degrees F., so I'd want the
> Y-axis to go, say 60-90, not arbitrarily start at zero; but I suspect this
> is a pretty standard thing in almost any plotting package.
This is straightforward in most plotting packages. Here's a simple
example of doing it in matplotlib:
#!/usr/bin/env python3
import matplotlib.pyplot as plt
times = [0, 1, 2, 3, 4, 5] # hours
temperatures = [68, 70, 75, 73, 72, 71] # Fahrenheit
fig = plt.figure(figsize=(5, 4))
ax = fig.add_axes([0.15, 0.15, 0.70, 0.70])
ax.plot(times, temperatures)
ax.set_xlabel('Time (hours)')
ax.set_ylabel(r'Temp ($^{\circ}\mathrm{F}$)')
ax.set_title('Temperature vs time')
plt.show()
--
Oscar
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[Tutor] Missing Standard Libraries on Python 3.5 for Mac
Hi, I am new to Python, and I am trying to use a Python Standard Library, namely ‘unicodedata’, however it appears to be missing (others are also missing) from the built-in libraries that come with Python 3.5 for Mac. I have searched the following directory, but have not found the library: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5 I have tried reinstalling Python 3.5 and also tried Python 3.4.3, and neither install the ‘unicodedata’ library. Is there anyway to install it manually? The library is present in the Python 2.7 version provided by Apple, however I was hoping to learn and use Python 3. The library is present in the Linux version of Python 3.5 that I have tried. Your help is greatly appreciated. -Andrew ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] ImportError: No module named connect
I have been trying to install the MySQL Connect module for a day and a half. First I got an error saying that "No module named mysql" was installed. After a lot of trial and error I got passed that. I realized that because I have python installed in /usr/local that I needed to build and then install the library into site-packages where Python was looking. But now it appears that the submodule "connect" cannot be located. Some people have suggested online that I needed to make sure the module was added to the system path by doing this: import sys sys.path.insert(1,'//usr/local/lib/python2.4/site-packages/mysql') import mysql Some have suggested that I needed to edit the __init__.py file in /mysql/ with this: from pkgutil import extend_path path = extend_path(path, name) But after I built and then installed pointing to my site-packages directory the __init__.py file in /usr/local/lib/python2.4/site-packages/mysql/ has that code already. The __init__.py in mysql/connector/ has a lot of stuff. It uses dot notation as well which is beyond my rudimentary Python knowledge: for example: from . import version from .connection import MySQLConnection It appears this is related to the install and that I am using /usr/local/lib/python2.4/site-packages. But I am running out of ideas to try. I am not Python expert as you can tell. Any suggestions? Again the error in my script where I try to import mysql.connection to connect to mysql is: import mysql.connect ImportError: No module named connect The installation instructions are : http://dev.mysql.com/doc/connector-python/en/connector-python-introduction.html Also I have tried installing it via yum. No go there either. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] ImportError: No module named connect
As I typed this out I double checked something. I resolved my own problem. Should have stepped back before posting. It is import mysql.connector not import mysql.connection From: stpete...@hotmail.com To: tutor@python.org Subject: ImportError: No module named connect Date: Tue, 3 Nov 2015 12:59:26 -0500 I have been trying to install the MySQL Connect module for a day and a half. First I got an error saying that "No module named mysql" was installed. After a lot of trial and error I got passed that. I realized that because I have python installed in /usr/local that I needed to build and then install the library into site-packages where Python was looking. But now it appears that the submodule "connect" cannot be located. Some people have suggested online that I needed to make sure the module was added to the system path by doing this: import sys sys.path.insert(1,'//usr/local/lib/python2.4/site-packages/mysql') import mysql Some have suggested that I needed to edit the __init__.py file in /mysql/ with this: from pkgutil import extend_path path = extend_path(path, name) But after I built and then installed pointing to my site-packages directory the __init__.py file in /usr/local/lib/python2.4/site-packages/mysql/ has that code already. The __init__.py in mysql/connector/ has a lot of stuff. It uses dot notation as well which is beyond my rudimentary Python knowledge: for example: from . import version from .connection import MySQLConnection It appears this is related to the install and that I am using /usr/local/lib/python2.4/site-packages. But I am running out of ideas to try. I am not Python expert as you can tell. Any suggestions? Again the error in my script where I try to import mysql.connection to connect to mysql is: import mysql.connect ImportError: No module named connect The installation instructions are : http://dev.mysql.com/doc/connector-python/en/connector-python-introduction.html Also I have tried installing it via yum. No go there either. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Missing Standard Libraries on Python 3.5 for Mac
Hi Andrew, On Tue, Nov 3, 2015 at 11:20 AM, Andrew Machen wrote: > Hi, > > I am new to Python, and I am trying to use a Python Standard Library, namely > ‘unicodedata’, however it appears to be missing (others are also missing) > from the built-in libraries that come with Python 3.5 for Mac. > > I have searched the following directory, but have not found the library: > > /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5 Have you tried importing it? If importing it works, you can then find where it lives by checking the __file__ attribute: import unicodedata print(unicodedata.__file__) > I have tried reinstalling Python 3.5 and also tried Python 3.4.3, and neither > install the ‘unicodedata’ library. Is there anyway to install it manually? It should be included with your installation, assuming you're using the package from python.org. If you are unable to import it, please raise an issue on the bug tracker at bugs.python.org. For the record, here's where unicodedata lives on my Mac: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/lib-dynload/unicodedata.cpython-35m-darwin.so Note that unicodedata is implemented in C, so it does not have a .py extension. -- Zach ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] ImportError: No module named connect
On Tue, Nov 03, 2015 at 12:59:26PM -0500, Tommy Peterson wrote:
> I have been trying to install the MySQL Connect module for a day and a half.
I see that you believe that you have solved your problem ("from mysql
import connector" rather than "connect" or "connection") but for the
record you have other problems.
I recognise that, right now, you probably have a working system and the
last thing you want to do is mess with it, but trust me, whoever has to
maintain your system in the future is going to be *utterly confused* by
your setup. If you choose to ignore this ("hey, my system works, I'm not
going to mess with it") at least copy this post into your site wiki (if
you have one) or put it in a README file somewhere where the next guy
(or even you, in the future) can see it. Because your Python setup is
*seriously* weird.
You talk about using the site-packages in python2.4. Why are you using
Python 2.4? That's ancient. I see that you are using a Redhat based
system, as you refer to yum, but it doesn't make sense that you have
Python 2.4 in /usr/local/lib.
In old Centos/Fedora/Redhat systems, where Python 2.4 is still used, we
have the path set here:
/usr/lib/python2.4/
*not* /usr/local/lib. Perhaps you are using a more recent RH-based
system, which defaults to Python 2.6 or 2.7. So why have you installed
2.4? It's so old that the mysql package won't work. I know it won't work
because mysql __init__.py includes the dot notation
from . import version
which is a SyntaxError in Python 2.4.
So it appears that:
- you have installed Python 2.4 in a non-standard place;
- installed a package for 2.6 or higher in the 2.4 site-packages;
- and are running Python 2.6 or higher using the 2.4 site-packages.
Anyone who has to maintain or administer your system is going to be
horribly confused.
Despite the references to 2.4 site-packages, I expect you are using
Python 2.6 or higher. You ought to be able to install the Python mysql
library using yum. On my Centos system, I can do this:
[root@ando ~]# yum search mysql-python
[...]
MySQL-python.i386 : An interface to MySQL
python26-mysqldb.i386 : An interface to MySQL
so all I need to do is:
sudo yum install mysql-python
to install into the system Python 2.4, or:
sudo yum install python26-mysqldb
to install into the yum-provided Python 2.6 installation. I don't know
which precise RH-based system you are using, but I would be *astonished*
if it didn't support the mysql package appropriate for your version of
Python. Installing things by hand, as you appear to have done, is not
needed.
Some further comments about the quality of advice you appear to have
been given:
> Some people have suggested online that I needed to make sure the
> module was added to the system path by doing this:
> import sys
> sys.path.insert(1,'//usr/local/lib/python2.4/site-packages/mysql')
I don't know who "some people" are, but that's clearly wrong.
site-packages will be automatically installed in the path (unless
something has gone horribly, horribly wrong!). And, you don't need to
add the package itself (mysql in this case) to the path. Well, you can,
but it goes against the concept of a self-contained package. It's
certainly not the right way to fix the problem.
> import mysql
> Some have suggested that I needed to edit the __init__.py file in /mysql/
> with this:
> from pkgutil import extend_path
> path = extend_path(path, name)
Absolutely not. Again, there are thousands of users of mysql. If
submodules couldn't be imported, surely they would have noticed, and the
mysql package fixed.
Having to hack a buggy package in that way might be a reasonable
suggestion for some sort of minor, half-debugged and slightly dodgy
library with one maintainer and three users, but certainly not for
something as widely-used as mysql.
> But after I built and then installed pointing to my site-packages
> directory the __init__.py file in
> /usr/local/lib/python2.4/site-packages/mysql/ has that code already.
> The __init__.py in mysql/connector/ has a lot of stuff. It uses dot
> notation as well which is beyond my rudimentary Python knowledge: for
> example:
>
> from . import version
> from .connection import MySQLConnection
As I mentioned above, this dot notation is not supported by
Python 2.4. But you've installed the package into the 2.4 site-packages.
If you ever run Python 2.4, this could cause problems for you.
Good luck!
--
Steve
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