description: fix docker error response from daemon: driver failed programming external connectivity on endpoint

check the port will be used in the container

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docker ps 
# or 
docker port <container_name>

check the same port used by other containers

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docker ps

option1 stop the containers used the port

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sudo docker stop <container_id>

if not fixed, the port could be occupied by other services

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netstat -tulpn | grep :<port_no>

option2 stop the services

option3 start the container with another port

description: new thread to run static method in java

Code for run static method in new thread in java

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new Thread(new Runnable() {
    public void run() {
        staticMethod();
    }
}).start();

description: Add a windows environment varibale without rebooting the computer

process to refresh environment variables without reboot windows

• open cmd commend prompt window
• input set PATH=C -> this will refresh the environment variables
• close and restart cmd window
• input echo %PATH% to test

description: use python to create a simplest server for testing website

code for python to create a web server

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python -m http.server

description: python create array with length

code for creating array with fix length

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>>> aList = [None] * 6
>>> aList
[None, None, None, None, None, None]

description: mount share folder to Linux in virtualbox

code to mount share folder to Ubuntu in virtualbox

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sudo mount -t vboxsf <sharefoldername> <linuxpath>
# e.g.
sudo mount -t vboxsf data ~/share/

description: the elements in a list subtract the same index elements in another list

code for list substraction in python

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l1 = [1,2,3]
l2 = [4,8,3]
dif = list(map(lambda x: x[0]-x[1], zip(l1,l2)))
# output: 
# [-3, -6, 0]

description:

code for wrap java debugger

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public static void e(String tag, String msg){
    if (LOG_LEVEL > ERROR)
        Log.e(tag, msg)
}
public static void w(String tsg, String msg){
    if (LOG_LEVEL > ERROR)
        Log.w(tag, msg)
}
public static void i(String tsg, String msg){
    if (LOG_LEVEL > ERROR)
        Log.i(tag, msg)
}

description: python code to plot sine wave

draw or plot sine curve code

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import numpy as np
import matplotlib.pyplot as plt

x=np.arange(0,2*np.pi,0.01)
y=np.sin(x)

plt.plot(x,y)
plt.show()

description: python remove last column

init data

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import pandas 
data = pandas.DataFrame({
    'a': [1, 2, 3], 
    'b': [0.1, 0.2, 0.3], 
    'c': ['a', 'b', 'a'], 
    'd': [1, 2, 3]
    })
# data
#    a    b  c  d
# 0  1  0.1  a  1
# 1  2  0.2  b  2
# 2  3  0.3  a  3

drop last column

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data[data.columns[:-1]]

output

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   a    b  c
0  1  0.1  a
1  2  0.2  b
2  3  0.3  a