Strings and Loops in Python

Seenivasan A — Fri, 22 May 2026 12:58:30 +0000

String

Strings are sequence of characters written inside quotes. It can include letters, numbers, symbols and spaces. Python does not have a separate character type.
Strings are immutable, meaning their values cannot be changed after creation. Any modification to a string creates a new string instead of altering the original one.

Common String Methods

Python string methods is a collection of in-built Python functions that operates on strings.

upper()
lower()
find()
split()
strip()
format()
join()

Discussed problems

Reverse a String
Password Authentication
Parse csv "java","1","2","3".."6"
Convert uppercase to lowercase

Examples

Parse csv "java","1","2","3".."6"

data = input("Enter CSV data: ")
values = data.split(",")
total = 0
for i in values:
    i = i.strip('"')
    if i.isdigit():
        total += int(i)

print("Total =", total)

Input-"java","1","2","3","4","5","6"

Output-Total = 21

Loop

Loops are used to execute a block of code repeatedly until a condition is met or all items in a sequence are processed. The main types are For loops (iterating over sequences) and While loops (executing code based on a condition).
break is used to exit a for loop or a while loop, whereas continue is used to skip the current block, and return to the "for" or "while" statement.

While Loop Syntax

while condition:
statement

For Loop Syntax

for variable in range(start, stop, step):
statement

Discussed problems

Sum of (N) numbers
Multiplication table
Print even numbers

Examples
Sum of (N) numbers

def sum_of_numbers(n):
    i=1
    sum=0
    while i<=n:
        sum+=i
        i+=1
    print("The sum of first",n,"numbers is:",sum)

n=int(input("Enter the number of terms: "))
sum_of_numbers(n)

Input-> N=10

Output-> Sum=55

Algorithms Discussed

Merge Sort

Binary Search And Linear Search

References
https://www.geeksforgeeks.org/dsa/merge-sort/

https://tutorialhorizon.com/algorithms/linear-search-vs-binary-search/

GitLab

Seenivasan A — Fri, 15 May 2026 17:38:57 +0000

GitLab was found by Dmitriy Zaporozhets and Valery Sizov in October 2011. It was distributed under MIT license and the stable version of GitLab is 10.4 released in January 22, 2018.

Gitlab is a service that provides remote access to Git repositories.

These additional features include managing the sharing of code between different people, bug tracking, wiki space and other tools for 'social coding'.

Git: A local tool installed on your computer to track code changes.

GitHub / Bitbucket: Remote websites used to host and share your Git code.

GitLab: A complete, all-in-one platform that hosts your code and automates your entire development process.

Why GitLab?
GitLab is a github like service that organizations can use to provide internal management of git repositories. It is a self hosted Git-repository management system that keeps the user code private and can easily deploy the changes of the code.

GitLab is a user friendly web interface layer on top of Git, which increases the speed of working with Git.

GitLab - Git Commands

$ git --version
$ git status
$ git add *
$ git push origin branch-name
$ git pull origin NAME-OF-BRANCH -u
$git checkout branch-name
$ git merge master

Authentication
Id-(@username) in the profile.
Create personal access tokens. When you use 2FA, you can use these tokens to access the GitLab API.

To Be Discuss?

GitLab provides its own Continuous Integration (CI) system for managing the projects and provides user interface along with other features of GitLab.
GitLab - SSH Key Setup

References
https://www.tutorialspoint.com/gitlab/gitlab_introduction.htm
https://suresoft.dev/knowledge-hub/continuous-integration/gitlab-ci/
https://docs.gitlab.com/administration/get_started/

DEV Community: Seenivasan A

Strings and Loops in Python

GitLab