Python: Data driven testing

Posted in python, Test Driven Development by Prem Aseem Jain

I love doing TDD – Test driven development.

Sharing a small code construct to include variety of data set in a concise manner without depending on any library

def double(n):
    return n*2

test_data = [
    (2 ,4),
    (4 ,8),
]

for given, expected in test_data:
    assert expected == double(given)
    print(f"Test passed for: given {given} and expected = {expected}")

Output on console
Test passed for: given 2 and expectation = 4
Test passed for: given 4 and expectation = 8

14Feb2021

How to sort custom objects in Type Script

Posted in JavaScript by Prem Aseem Jain

Imagine you have a student class and you need to sort it reverse order of marks field to calculate ranks of students in the class.

class Student{
    name:String
    marks:Number
    constructor(name:string, marks:number) {
        this.name = name
        this.marks = marks
    }
}

Student objects as part of the array.

var students:Array<Student> = [
    new Student("aseem",47),
    new Student("prem",97),
    new Student("john",100)

]

sort students by comparing them based on marks field.

console.log(students.sort( (a,b)=> a.marks > b.marks ? -1:1 ))

here, we used the arrow function which takes a and b objects as params, then we used the ternary operator to compare marks and return the number as -1 or 1 as the result of comparison.

10Feb2021

Is semicolon needed in Java Script? horror of ;

Posted in JavaScript by Prem Aseem Jain

Short answer is NO in recent times, here is why
The semicolon is used to separate statements, but it can be omitted if the statement is followed by a line break.
The semicolon is needed, only when you have two or more statements on the same line, not other wise 🙂 

    var i = 0; i++        // <-- semicolon obligatory
                          //     (but optional before newline)
    var i = 0             // <-- semicolon optional
        i++               // <-- semicolon optional

7Feb2021

Python script to take mongodb backup

Posted in mongoDB, python by Prem Aseem Jain

"""
@Author: Aseem Jain
@profile: https://www.linkedin.com/in/premaseem/

"""
import os
import pymongo

# configure credentials / db name
db_user = os.environ["MONGO_ATLAS_USER"]
db_pass = os.environ["MONGO_ATLAS_PASSWORD"]
db_name = "sample_mflix"

connection_string = f"mongodb+srv://{db_user}:{db_pass}@sharedcluster.lv3wx.mongodb.net/{db_name}?retryWrites=true&w=majority"

client = pymongo.MongoClient(connection_string)
db = client[db_name]

# create database back directory with db_name
os.makedirs(db_name, exist_ok=True)

# list all tables in database
tables = db.list_collection_names()

# dump all tables in db
for table in tables:
    print("exporting data for table", table )
    data = list(db[table].find())
    # write data in json file
    with open(f"{db.name}/{table}.json","w") as writer:
        writer.write(str(data))

exit(0)

11Jan2021

User defined custom object sorting in python

Posted in python by Prem Aseem Jain

"""
@Author: Aseem Jain
@profile: https://www.linkedin.com/in/premaseem/

Title: Sort the class or custom object and not regular int / string using in build sort funcitons
Sort custom object can be done in 2 ways
1. Static way : class implementing < less then __lt__(self,other)
2. Dynamic way is by providing lambda func with key.
"""
class User:
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def __repr__(self):
        return self.name + str(self.age)

    def __lt__(self, other):
        return self.age < other.age

# Sorting String
ls = ["zeema", "aseemjain", "see",str(3),str(13),"$$"]
ls.sort()
print(ls)
#output: ['$$', '3', 'aseemjain', 'see', 'zeema']

# Reverse soring
ls.sort(reverse=True)
print(ls)
# output: ['zeema', 'see', 'aseemjain', '3', '$$']

# sorting Custom object
users = [User("aseem",16),User("aseemprem",56),User("premaseem",23),User("zseem",36),User("nseem",106) ]
users.sort(key = lambda x: x.name)
users.sort()
print(users)
# output : [aseem16, aseemprem56, nseem106, premaseem23, zseem36]

# create new sorted list
newlist = sorted(users, key=lambda x: x.age, reverse=True)
print(newlist)
# output: [nseem106, aseemprem56, zseem36, premaseem23, aseem16]

Github link: https://github.com/premaseem/pythonPlayground/blob/master/algorithm_and_datastructure/sorting/custom_object_sorting.py

7Jan2021

Yoga Instructor Certificate

Posted in Art of living, Certificates by Prem Aseem Jain

I am now a certified Yoga Teacher, thanks to Sri Sri Yoga, a certified school under the Ministry of AYUSH, Govt. of India & Yoga Alliance Registered Yoga School. I scored 97% marks in exams.

It was a 200 hour, 8 weeks online Yoga teachers training program. I was able to lose extra weight from my body and mind ( ie stress / Chitta Vritattis / Vikalpa) and got an entirely new way of life. All my digestion related issues are gone. I feel calmer throughout the day. Learned so much about my own body ( muscles, bone, ligaments, tendons ) and mind (modulations, stresses, obstacles).

After finishing the training, I realized why the entire world is learning and practicing yoga to maintain their mental and physical health.

If you’re interested in learning, how Yoga can help you, feel free to contact me.

My online yoga studio link: https://yogawithprem.wordpress.com/

My Facebook yoga page: https://www.facebook.com/fitnesswithprem

My youtube channel link: https://www.youtube.com/channel/UCbor429hZLmDeL7nzz8eQQw

With love,
Prem Aseem Jain