Python : How to copy files from one location to another using shutil.copy()

Just check the example code

..

import shutil

# Copy file to another directory

newPath = shutil.copy('sample1.txt', '/home/varung/test')

print("Path of copied file : ", newPath)

#Path of copied file :  /home/varung/test/sample1.txt

#Copy a file with new name

newPath = shutil.copy('sample1.txt', '/home/varung/test/sample2.txt')

print("Path of copied file : ", newPath)

#Path of copied file :  /home/varung/test/sample2.txt

# Copy a symbolic link as a new link

newPath = shutil.copy('/home/varung/test/link.csv', '/home/varung/test/sample2.csv')

print("Path of copied file : ", newPath)

#Path of copied file :  /home/varung/test/sample2.csv

# Copy target file pointed by symbolic link

newPath = shutil.copy('/home/varung/test/link.csv', '/home/varung/test/newlink.csv', follow_symlinks=False)

print("Path of copied file : ", newPath)

#Path of copied file :  /home/varung/test/newlink.csv

..

How to delete a file or folder? (python code)

Use os or shut library

os.remove() removes a file.

os.rmdir() removes an empty directory.

shutil.rmtree() deletes a directory and all its contents.

EX)

import os

os.remove("/tmp/<file_name>.txt")

os.rmdir("/tmp/")

import shutil

shutil.rmtree("/tmp/")

ex2)

if os.path.isdir('./runs/ex'):

    shutil.rmtree('./runs/ex')

os.mkdir('./runs/ex')

WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!

Someone could be eavesdropping on you right now (man-in-the-middle attack)!

It is also possible that a host key has just been changed.

The fingerprint for the ECDSA key sent by the remote host is

...

simple solutin :

ssh-keygen -R <host>

Ex)

ssh-keygen -R 192.168.3.10
ssh-keygen -R ubuntu@ec2-30.30.30.eu-west-1.compute.amazonaws.com

use docker without sudo

1.Create the docker group.

> sudo groupadd docker

2.Add your user to the docker group.

> sudo usermod -aG docker $USER

3.Log out and log back in so that your group membership is re-evaluated.

> newgrp docker 

4.Verify that you can run docker commands without sudo.

>docker run hello-world

transfer local docker image to another machine

Transfer docker image A -> B

1. Make zip file on A 

docker save -o ./example.tar image_name

2. Transfer example.tar  A to B using scp, rsync, or in some way

3. Load image on B

docker load -i ./example.tar

install docker on ubuntu 18.04

Step 1: Update Software Repositories

sudo apt-get update

Step 2: Uninstall Old Versions of Docker

sudo apt-get remove docker docker-engine docker.io

Step 3: Install Docker

sudo apt install docker.io

Step 4: Start and Automate Docker

sudo systemctl start docker

sudo systemctl enable docker

Step 5 (Optional): Check Docker Version

docker --version

get unique value from list (python source code)

..

import numpy as np

def unique(list1):

x = np.array(list1)

x = np.unique(x)

return list(x)

list1 = [10, 20, 10, 30, 40, 40]

list1 = unique(list1)

print(list1)

..
output
[10, 20, 30, 40]
..

shuffle two related list python

method #1
..

a=['aaaaa','bbbb','cccc','dddd']

b=[1, 2, 3, 4]

from sklearn.utils import shuffle

list_1, list_2 = shuffle(a, b)

print(list_1, list_2)

#['cccc', 'aaaaa', 'dddd', 'bbbb'] [3, 1, 4, 2]

..

method #2
...

list1_shuf = []

list2_shuf = []

index_shuf = list(range(len(a)))

shuffle(index_shuf)

for i in index_shuf:

list1_shuf.append(a[i])

list2_shuf.append(b[i])

print(list1_shuf)

print(list2_shuf)

#['cccc', 'aaaaa', 'bbbb', 'dddd']

#[3, 1, 2, 4]

...

Using Virtual Environments in Jupyter Notebook and Python

activate user virtualenv
>source yourenv/bin/activate

install ipykernel
>(yourenv) pip install --user ipykernel


Add you virtualenv to jupyter
>(yourenv) python -m ipykernel install --user --name=myenv

Then you can choose myenv to create new file.



key commands:

pip install --user ipykernel

python -m ipykernel install --user --name=myenv

denied: Your Authorization Token has expired. Please run 'aws ecr get-login' to fetch a new one.

error:
denied: Your Authorization Token has expired. Please run 'aws ecr get-login' to fetch a new one.

this is worked for me
>eval $( aws ecr get-login --no-include-email --region eu-west-1 )