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What is the common header format of Python files?
...
I agree that makes sense if you use any Python 2. For Python3, personally I'm happy to rely on implicit when the default is sensible and universal. We don't explicitly define the meaning of "+" whenever we use it.
– Jonathan Hartley
Jun 16 ...
How to find out the number of CPUs using python
...stem:
taskset -c 0 ./main.py
with the test script:
main.py
#!/usr/bin/env python3
import multiprocessing
import os
print(multiprocessing.cpu_count())
print(os.cpu_count())
print(len(os.sched_getaffinity(0)))
then the output is:
16
16
1
nproc however does respect the affinity by default and:
tas...
what does the __file__ variable mean/do?
...y:
from pathlib import Path
print(__file__)
print(Path(__file__))
Running python3 x.py will output:
/home/aderchox/mytest/y.py
/home/aderchox/mytest/y.py ...
How do you create nested dict in Python?
...y create a new key entry in the dict and cause a lot of havoc.
Here is a Python3 example with nested_dict module:
import nested_dict as nd
nest = nd.nested_dict()
nest['outer1']['inner1'] = 'v11'
nest['outer1']['inner2'] = 'v12'
print('original nested dict: \n', nest)
try:
nest['outer1']['wro...
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App Inventor为...
Getting individual colors from a color map in matplotlib
...e where we make CSV representation for a custom colormap:
#! /usr/bin/env python3
import matplotlib
import numpy as np
vmin = 0.1
vmax = 1000
norm = matplotlib.colors.Normalize(np.log10(vmin), np.log10(vmax))
lognum = norm(np.log10([.5, 2., 10, 40, 150,1000]))
cdict = {
'red':
(
...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...
Update for those using Python3:
You can simply use conda install mysqlclient to install the libraries required to use MySQLdb as it currently exists. The following SO question was a helpful clue: Python 3 ImportError: No module named 'ConfigParser'...
Why do people say that Ruby is slow? [closed]
... get some numbers at the Computer Language Benchmarks Game:
Ruby 1.9 vs. Python3 within the same order of magnitude
Ruby 1.9 vs. PHP within the same order of magnitude
Ruby 1.9 vs. Java 6 server up to two orders of magnitude slower!
Ruby 1.9 vs. C (gcc) up to two orders of magnitude slower!
...
...
Build the full path filename in Python
...o access arguments passed to the script when executing it:
#!/usr/bin/env python3
# coding: utf-8
# import netCDF4 as nc
import numpy as np
import numpy.ma as ma
import csv as csv
import os.path
import sys
basedir = '/data/reu_data/soil_moisture/'
suffix = 'nc'
def read_fid(filename):
fid ...
Accessing dict keys like an attribute?
...ed and another one in __dict__
Causes a memory leak in Python < 2.7.4 / Python3 < 3.2.3
Pylint goes bananas with E1123(unexpected-keyword-arg) and E1103(maybe-no-member)
For the uninitiated it seems like pure magic.
A short explanation on how this works
All python objects internally store th...