You have a list of X/Y coordinates, for example:
coords = [(6.74219, -53.57835),
(6.74952, -53.57241),
(6.75652, -53.56289),
(6.74756, -53.56598),
(6.73462, -53.57518)]For these coordinates you want to compute the minimum bounding box.
Occasionally I have to clean up some HTML code – mostly because parts of it were pasted into a CMS like WordPress from rich text editor like Word.
I’ve noticed that the formatting I want to remove is mostly based on span and div elements with a style attribute. Therefore, I’ve written a simple Python script based on BeautifulSoup4 which will replace certain tags with their contents if they have a style attribute. While in some cases some other formatting might be destroyed by such a script, it is very useful for some recurring usecases.
The LP2980–ADJ is a 50 mA LDO that be configured for an output voltage from 1.23V to 15V using a pair of resistors.
The datasheet lists a formula for the output voltage, however no easy-to-use customizable software is provided that can be used to directly compute the correct resistor in a reproducible way. Continue reading →
The following html code can be used to create an html form that allows uploading multiple files at once:
<form enctype="multipart/form-data" method="POST" action="upload.py">
<table style="width: 100%">
<tr>
<td>Choose the files to upload:</td>
<td style="text-align: right"><input type="file" multiple="" id="files" name="files"></td>
</tr>
<tr>
<td><input id="fileUploadButton" type="submit" value="Upload >>"></td>
<td></td>
</tr>
</table>
</form>In electronics engineering there is a wide variety of notations for values that need to be recognized by intuitive user interfaces. Examples include:
The wide variety of options, including thousands separators, comma-as-decimal-separator and suffix-as-decimal-separator, optional whitespace and scientific notations makes it difficult to normalize values without using specialized libraries. Continue reading →
You want to calculate the correct value for the Ilim resistor for the NCP380 current limiter IC with a custom current limit. Continue reading →
You want to find the E24/E48/E96 resistor value that is closest to a given exact value programmatically using python. Continue reading →
In electronics engineering, from time to time you have to use standard formulas to characterize your circuits. To what extent you need to calculate all parameters most often depends on the requirement.
For example, consider the formula for the -3dB cutoff frequency of a 1st order RC lowpass filter:
f_c=\frac{1}{2\pi RC}Although this equation is fairly simple and most people won’t have any problem solving it for any particular variable in a few seconds, it can serve as a basic example on how to solve an equation symbolically.
One of the easiest ways of performing this task is to use SymPy, a Python library for symbolic mathematics.
Similar to our previously published UniPruot parser, MeSH provides an ASCII format that can easily be parsed using Python.
Just like the UniProt parser, this function yields MeSH entries represented by dictionaries. Example code is included at the bottom of the file.
Your python 3.x interpreter prints the error message
ImportError: cannot import name 'urlencode'
You hard drive or SMART tool reports errors when reading specific blocks similar to this message:
[3142.686141] end_request: I/O error, dev sda, sector 31415926
No matter how often you read the block, the hard drive still returns an error and does not reallocate the block.
Torrent files are essentially containers that store information about a set of files to be downloaded via P2P.
Unfortunately it is not easily possible to simply list the files that are stored in a torrent. Using our python script torrentls.py you can easily accomplish that task.
Just like many other databases in computational biology, the downloads for the popular UniProt database are available in a custom text format which is documented on ExPASy.
While it is certainly not difficult writing a generic parser and one can use BioPython, I believe it is often easier to use a tested parser that only uses standard libraries.
Recently I started to add unit tests using setuptools to one of my packages.
In order to do this, I added a test directory containing MyUnitTest.py. setup.py was properly setup using the
test_suite="tests"
option.
However, when running
python setup.py test
I got this error message:
running test
running egg_info
writing MyPackage.egg-info/PKG-INFO
writing top-level names to MyPackage.egg-info/top_level.txt
writing dependency_links to MyPackage.egg-info/dependency_links.txt
reading manifest file 'MyPackage.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'MyPackage.egg-info/SOURCES.txt'
running build_ext
Traceback (most recent call last):
File "setup.py", line 29, in <module>
'Topic :: Scientific/Engineering :: Information Analysis'
File "/usr/lib/python3.4/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib/python3.4/distutils/dist.py", line 955, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.4/distutils/dist.py", line 974, in run_command
cmd_obj.run()
File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 135, in run
self.with_project_on_sys_path(self.run_tests)
File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 116, in with_project_on_sys_path
func()
File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 160, in run_tests
testLoader = cks
File "/usr/lib/python3.4/unittest/main.py", line 92, in __init__
self.parseArgs(argv)
File "/usr/lib/python3.4/unittest/main.py", line 139, in parseArgs
self.createTests()
File "/usr/lib/python3.4/unittest/main.py", line 146, in createTests
self.module)
File "/usr/lib/python3.4/unittest/loader.py", line 146, in loadTestsFromNames
suites = [self.loadTestsFromName(name, module) for name in names]
File "/usr/lib/python3.4/unittest/loader.py", line 146, in <listcomp>
suites = [self.loadTestsFromName(name, module) for name in names]
File "/usr/lib/python3.4/unittest/loader.py", line 117, in loadTestsFromName
return self.loadTestsFromModule(obj)
File "/usr/lib/python3/dist-packages/setuptools/command/test.py", line 26, in loadTestsFromModule
for file in resource_listdir(module.__name__, ''):
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 954, in resource_listdir
resource_name
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1378, in resource_listdir
return self._listdir(self._fn(self.module_path,resource_name))
File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1415, in _listdir
"Can't perform this operation for unregistered loader type"
NotImplementedError: Can't perform this operation for unregistered loader typeYou want to read substitution matrices in the matblas format, e.g. this BLOSUM62 from NCBI into a numpy ndarray.
You need a list of countries, ordered by continent, under a liberal license.
You need to calculate the center star approximation for a given set of sequences. Instead of calculating the sequence distances and center string by hand, you want the computer to do the hard work.