DEV Community: Angela

Useful Git commands

Angela — Mon, 13 Feb 2023 13:50:46 +0000

** Set up the URL to the new repo **

git remote set-url origin git@github.com:my-profile/new-repo.git

Log

git log --oneline --graph --all

Revert to Head

If you are not sure of the hash of the last commit, you can go back to the commit before the merge

git reset --hard HEAD~1

To update remote branch:

git push -f

Revert a commit

git reset --hard [commit ID]

To update remote branch:

git push -f

I've used this command to revert to a previous commit after a merging error. It did not removed files that were marked as added.

Revert a single file to a specific version

Find the commit ID of the version of the file you want to revert to.
Find the path to the file you want to revert from the working directory.
In the terminal, change directories to the working directory. -Type:

git checkout [commit ID] -- path/to/file and hit enter.

Commit the change to the reverted file.

Changes to be committed:
(use "git restore --staged ..." to unstage)
modified: app/x.py

Changes not staged for commit:
(use "git add ..." to update what will be committed)
(use "git restore ..." to discard changes in working directory)
modified: app/x.py

Commit empty

git commit --allow-empty -m "[notest]"

Add specific changes
git add --patch

Useful links:

freeCodeCamp undo merge

Bootcamp Cloud Data Engineer

Angela — Mon, 08 Nov 2021 12:46:47 +0000

Cognizant Cloud Data Engineer
Bem vindo ao seu bootcamp focado em engenharia de dados com Cloud, crie soluções Python, uma das principais linguagens de programação da atualidade, aprenda os principais conceitos de big data e dê seus primeiros passos no ambiente de nuvem.

Cognizant Cloud Data Engineer

Python custom sum to speed up summation of range objects

Angela — Sat, 06 Mar 2021 19:00:28 +0000

If you have an object of type range in python, you can use the arithmetic progression formula to perform the sum of its elements.

Sn = (n/2) [2a + (n-1)d]

Where,
n: total number of elements
a: first element
d: common difference

Create a custom sum in python to speed up summation of objects of type range.

def custom_sum(obj):
    if isinstance(obj, range):
        n = len(obj)
        a = obj.start
        d = obj.step
        return (n * (2 * a + (n - 1) * d)) / 2
    else:
        return sum(obj)

Stalin sort

Angela — Sat, 06 Mar 2021 15:35:32 +0000

# Stalin sort
# Check if the list is ordered, if it is not, remove the element.

import numpy as np


# Code
def stalin_sort(list_a):
    len_a = len(list_a)
    the_end = False
    i = 0
    j = i + 1
    while not the_end:
        if list_a[i] > list_a[j]:
            list_a.pop(j)
            len_a = len(list_a)
            if i == len_a - 1:
                the_end = True
        else:
            i += 1
            j += 1
            if j == len_a:
                the_end = True

    return list_a


# Input
n = 25  # Elements
A = np.random.randint(low=0, high=50, size=n)
A = list(A)
print(f"Input: {A}")

# Output
print(f"Output: {stalin_sort(A)}")

Generate random passwords in Python using secrets

Angela — Sat, 06 Feb 2021 23:45:15 +0000

Read the docs: https://docs.python.org/3/library/secrets.html

I copied this example from python docs and added special characters to the password.

import secrets
import string


alphabet = string.ascii_letters + string.digits + '!@#$%^&*()-+[]'
while True:
    password = ''.join(secrets.choice(alphabet) for i in range(10))
    if (any(c.islower() for c in password)
            and any(c.isupper() for c in password)
            and any(c.isalnum() for c in password)
            and any(not(c.isalnum()) for c in password)
            and any(c.isdigit() for c in password)):
        break

Bootcamp Java Developer Day #11

Angela — Sat, 03 Oct 2020 02:02:52 +0000

Day 11:

Finished one course and solved 5 challenges level easy.

8) Finished: Implementing Collections and Streams with Java

Today's topic were:

Optional
java.util.Optional
Streams
stream().count());
stream().max(Comparator.comparingInt(String::length))
stream().filter()
collect(Collectors.toList())
stream().map()
stream().limit(3).collect(Collectors.toList())
stream().peek()
collect(Collectors.joining(", "))
collect(Collectors.toSet())
collect(Collectors.groupingBy())

9) Arithmetic Fundaments in Java

This part was composed by five challenges about arithmetic operations. Level easy.

Bootcamp Java Developer Day #10

Angela — Fri, 02 Oct 2020 01:13:50 +0000

Day 10:

Resuming to bootcamp...

I only studied one topic today. There is always a small test at the end of each topic and I bombed it five times. I think I'm tired and I'm not absorbing much content today.

The Discrete Mathematics test had two tough questions for me, but I think I did well. Let's see when the Professor release the grades.

8) Ongoing: Implementing Collections and Streams with Java

Today's topic were:

Comparator java.util.Comparator; java.util.Comparable + java.util.ArrayList; java.util.Collections; java.util.List;

We used these interfaces to order lists. I didn't try to code bubble sort, insertion sort or any other sorting algorithm in Java for comparison. I've done them in python, maybe I can rewrite them in Java in the future.

Bootcamp Java Developer: Pause...

Angela — Tue, 29 Sep 2020 19:59:43 +0000

I have to pause the bootcamp because I'm going to have a test on Fundaments of Discrete Mathematics on Thursday morning.

Bootcamp Java Developer Day #9

Angela — Tue, 29 Sep 2020 01:18:52 +0000

Day 9:

Still learning about Collections in Java. Somethings I already knew from python, but I realized I need to study binary trees.

8) Ongoing: Implementing Collections and Streams with Java

Today's topics were:

Queue
java.util.LinkedList;
java.util.Queue;
Set
java.util.Set
java.util.HashSet
java.util.TreeSet
java.util.LinkedHashSet
Map
java.util.Map;
java.util.HashMap
java.util.TreeMap
java.util.HashTable
java.util.Iterator

Bootcamp Java Developer Day #8

Angela — Mon, 28 Sep 2020 01:19:47 +0000

Day 8:

Done the first challenges + Started another course. This one is focused on Java Collections and Streams.

7) Completed: Introduction to Java Programming

This part was composed by three challenges level super easy. I aced them fast.

8) Started: Implementing Collections and Streams with Java

The first topic is List and I used these modules:

java.util.ArrayList;
java.util.Collections;
java.util.Iterator;
java.util.List;

Bootcamp Java Developer Day #7

Angela — Sun, 27 Sep 2020 01:44:21 +0000

Day 7:

Yay! Finished the first course in Java (9 hours). It took me a lot of time to work with checkstyle and pmd, but they are working now. :D
I'm tired, so I'm not going into the specifics.
I think this course (from Digital Innovation One) is a good introduction. I think the Array and Exception topics were weak though.

6) Completed: Basic Development in Java

Topics:

Strings, java.lang
Conditionals, operators, loops
Arrays
Exceptions
Object Oriented with Java
SOLID
Date: DateFormat, LocalDateTime, etc

Bootcamp Java Developer Day #6

Angela — Sat, 26 Sep 2020 01:50:51 +0000

Day 6:

6) Ongoing: Basic Development in Java

Topic 4: Characteristics of Java language

Created a Java project in IntelliJ with examples to learn some characteristics of the language, such as:

Classes
Types: primitives, nonprimitives, wrappers, strong/weak type, static type
Access modifiers: public, private, protected, default
Abstract
Final
Interfaces
Enum