Building a hash table in python
Recently, while I was reading about the implementation of Hash in ruby (similar to a dict in python) and wrote a simple implementation of a hash table in pyt...
Posts by Category
- python 13
- go 8
- ruby 5
- theory 3
- data 2
- channels 1
- structs 1
- decorators 1
- http 1
- timeout 1
- structures 1
- tools 1
- jq 1
- json 1
- email 1
- validation 1
- tracing 1
- microservices 1
- distributed 1
- Kafka 1
- compaction 1
- java 1
- exceptions 1
- tips 1
- bitset 1
- bit-array 1
- vegeta 1
- benchmarking 1
- search 1
- index 1
- memory 1
- string 1
- logging 1
- patterns 1
- encryption 1
- javascript 1
- functional 1
- parsing 1
- pyparsing 1
- uuid 1
- solid 1
- principles 1
- memoization 1
- queues 1
- dependency-injection 1
- testing 1
- flask 1
- logzio 1
- logs 1
- cli 1
- httpie 1
- unittest 1
- mock 1
- autospec 1
- pytest 1
- parametrize 1
- migrations 1
- database 1
- sql 1
- sqlalchemy 1
- orm 1
- atexit 1
- rails 1
- activerecord 1
- llm 1
- pdf 1
- hashing 1
python
Chat with a PDF file using Ollama and Langchain
As lots of engineers nowadays, about a year ago I decided to start diving deeper into LLMs and AI.
Cleanup functions using the atexit module
Recently, I was going through the documentation and codebase of a python package (specifically kafka-python) and was curious about how cleaning up resources ...
Deleting and re-inserting a record in SQLAlchemy in the same transaction
Recently, I was puzzled with an issue while working on one of my projects. In an endpoint I was building, I had to delete an existing record of a table and c...
Quick tip: Easily identify failing parametrized test in pytest with pytest.param
Pytest is a great tool for writing and running tests in python. One of the features I find myself using a lot is parametrized tests.
Mocking in python with autospec
Mocking and mocks are really useful when writing tests, as they allow isolating the test target from its dependencies, leading to less fragile tests.
Send logs to logz.io from your Flask application
Logging is of great importance for web applications, both while in your local environment and for production applications. Logs can be analyzed and reveal is...
Property testing with hypothesis
Testing is a huge field and takes a significant amount of time to master. There are several types of tests, like unit, functional, integration, end-to-end (e...
Dependency injection in python
Dependency injection is a technique that “injects”/passes dependencies between objects in a way that leads to code that is easier to test and maintain.
Queues in python
Queues are a really useful data structure that are being frequently used both in application code and are also utilized by libraries. In this post, we’ll see...
Memoization in python
Memoization is loosely defined as an optimization technique that is usually applied on functions that are quite expensive to run.
Quick tip: Generating unique IDs in python
There are several cases where we need to generate a unique identifier in our applications. One way to do it is to roll your own implementation, usually rando...
Parsing a mini query language with python and pyparsing
Recently, I had to parse an SQL-like statement coming in as a query parameter for an python API endpoint. This mini query language had to support AND, OR and...
go
Implementing a circuit breaker in go
Recently I read about the circuit breaker pattern and I believe it is an interesting pattern with many use cases in today’s microservices-centric universe :)
Logging in go
It is common knowledge that logging is super important. It is necessary for debugging purposes on your local environment or for tracing some weird behavior i...
Load test your API with vegeta
During the last few years, when I want to load test my APIs, my go to tool is vegeta. It is an awesome load testing command line tool. It is easy to use and ...
Implementing a bit array in go
A bit array (or bit set) is an array data structure that stores bits (0 or 1 value) in a space efficient, compact way (read more about bit arrays on wikipedi...
Validating an email in go
Recently, I wanted to validate emails for a small project I work on. I didn’t want to search for libraries that might do the job, so I decided to build the v...
How to time out requests in your go API
When building an API (or other kinds of applications, to be frank), sometimes it is useful to set some constraints to the task being carried out (e.g. handli...
Embedded and promoted fields in go structs
Structs are one of the most widely used data structures in go. Combined with interfaces and methods, structs allow us model our data in a way that is somehow...
How to use nil channels in Go ?
Channels is an integral part of Go applications. They are typed conduits that allow communication between different parts of an application. Recently, I came...
ruby
New behavior when exiting activerecord transactions with return in Rails 7
Recently, I decided to upgrade one of my projects from Rails 6.0 to 7.0. After going through the changelogs of each release between 6.0 and 7.0 and through t...
Encryption the easy way with lockbox gem
There are several occasions where we need to encrypt some data, whether they are fields in a database or files. In some cases, encryption is needed in order ...
Reducing memory consumption in ruby with frozen strings
In ruby, lots of times we have to deal with several strings, whether we are working with a rails application and we are building JSON responses, or we have a...
Searching with an inverted index in Ruby
Recently, I read blog post about elasticsearch, called Elasticsearch from the Bottom Up. A data structure that is very important to performing full-text sear...
How to work with decorators in ruby
Sometimes, we find ourselves wanting to add functionality to objects of a class without affecting all objects of the class (unlike inheritance or composition...
theory
SOLID principles: Single responsibility
SOLID is a set of principles that lead to cleaner, more maintenable and extensible code. The first principle is the Single Responsibility Principle or SRP.
Functional programming with Javascript
In the past few years, functional programming’s popularity has increased and new languages (like elixir or scala) that embrace it have been created. But what...
Data structures: Bloom filter
As we all know, there is a vast number of data structures out there. One of the data structure categories is probabilistic data structures. Probabilistic dat...
data
Queues in python
Queues are a really useful data structure that are being frequently used both in application code and are also utilized by libraries. In this post, we’ll see...
Data structures: Bloom filter
As we all know, there is a vast number of data structures out there. One of the data structure categories is probabilistic data structures. Probabilistic dat...
channels
How to use nil channels in Go ?
Channels is an integral part of Go applications. They are typed conduits that allow communication between different parts of an application. Recently, I came...
structs
Embedded and promoted fields in go structs
Structs are one of the most widely used data structures in go. Combined with interfaces and methods, structs allow us model our data in a way that is somehow...
decorators
How to work with decorators in ruby
Sometimes, we find ourselves wanting to add functionality to objects of a class without affecting all objects of the class (unlike inheritance or composition...
http
How to time out requests in your go API
When building an API (or other kinds of applications, to be frank), sometimes it is useful to set some constraints to the task being carried out (e.g. handli...
timeout
How to time out requests in your go API
When building an API (or other kinds of applications, to be frank), sometimes it is useful to set some constraints to the task being carried out (e.g. handli...
structures
Data structures: Bloom filter
As we all know, there is a vast number of data structures out there. One of the data structure categories is probabilistic data structures. Probabilistic dat...
tools
Awesome cli tools: jq json processor
There are some command line tools that I use almost on a daily basis and make my life a lot easier. One of those tools is jq. Jq is a lightweight and flexibl...
jq
Awesome cli tools: jq json processor
There are some command line tools that I use almost on a daily basis and make my life a lot easier. One of those tools is jq. Jq is a lightweight and flexibl...
json
Awesome cli tools: jq json processor
There are some command line tools that I use almost on a daily basis and make my life a lot easier. One of those tools is jq. Jq is a lightweight and flexibl...
Validating an email in go
Recently, I wanted to validate emails for a small project I work on. I didn’t want to search for libraries that might do the job, so I decided to build the v...
validation
Validating an email in go
Recently, I wanted to validate emails for a small project I work on. I didn’t want to search for libraries that might do the job, so I decided to build the v...
tracing
Distributed tracing with Zipkin
Nowadays, more and more projects are built using the service-oriented architecture (SOA) and more specifically using microservices: several services that hav...
microservices
Distributed tracing with Zipkin
Nowadays, more and more projects are built using the service-oriented architecture (SOA) and more specifically using microservices: several services that hav...
distributed
Distributed tracing with Zipkin
Nowadays, more and more projects are built using the service-oriented architecture (SOA) and more specifically using microservices: several services that hav...
Kafka
Using Kafka log compaction
If you are working in a service oriented architecture (e.g. building or maintaining microservices), there is a good chance you have used, are currently using...
compaction
Using Kafka log compaction
If you are working in a service oriented architecture (e.g. building or maintaining microservices), there is a good chance you have used, are currently using...
java
Quick tip: Avoiding null pointer exceptions in Java
Admit it. It has happened (not even just once) to all of us. Building something with Java and getting null pointer exceptions because: a) we did not check fo...
exceptions
Quick tip: Avoiding null pointer exceptions in Java
Admit it. It has happened (not even just once) to all of us. Building something with Java and getting null pointer exceptions because: a) we did not check fo...
tips
Quick tip: Avoiding null pointer exceptions in Java
Admit it. It has happened (not even just once) to all of us. Building something with Java and getting null pointer exceptions because: a) we did not check fo...
bitset
Implementing a bit array in go
A bit array (or bit set) is an array data structure that stores bits (0 or 1 value) in a space efficient, compact way (read more about bit arrays on wikipedi...
bit-array
Implementing a bit array in go
A bit array (or bit set) is an array data structure that stores bits (0 or 1 value) in a space efficient, compact way (read more about bit arrays on wikipedi...
vegeta
Load test your API with vegeta
During the last few years, when I want to load test my APIs, my go to tool is vegeta. It is an awesome load testing command line tool. It is easy to use and ...
benchmarking
Load test your API with vegeta
During the last few years, when I want to load test my APIs, my go to tool is vegeta. It is an awesome load testing command line tool. It is easy to use and ...
search
Searching with an inverted index in Ruby
Recently, I read blog post about elasticsearch, called Elasticsearch from the Bottom Up. A data structure that is very important to performing full-text sear...
index
Searching with an inverted index in Ruby
Recently, I read blog post about elasticsearch, called Elasticsearch from the Bottom Up. A data structure that is very important to performing full-text sear...
memory
Reducing memory consumption in ruby with frozen strings
In ruby, lots of times we have to deal with several strings, whether we are working with a rails application and we are building JSON responses, or we have a...
string
Reducing memory consumption in ruby with frozen strings
In ruby, lots of times we have to deal with several strings, whether we are working with a rails application and we are building JSON responses, or we have a...
logging
Logging in go
It is common knowledge that logging is super important. It is necessary for debugging purposes on your local environment or for tracing some weird behavior i...
patterns
Implementing a circuit breaker in go
Recently I read about the circuit breaker pattern and I believe it is an interesting pattern with many use cases in today’s microservices-centric universe :)
encryption
Encryption the easy way with lockbox gem
There are several occasions where we need to encrypt some data, whether they are fields in a database or files. In some cases, encryption is needed in order ...
javascript
Functional programming with Javascript
In the past few years, functional programming’s popularity has increased and new languages (like elixir or scala) that embrace it have been created. But what...
functional
Functional programming with Javascript
In the past few years, functional programming’s popularity has increased and new languages (like elixir or scala) that embrace it have been created. But what...
parsing
Parsing a mini query language with python and pyparsing
Recently, I had to parse an SQL-like statement coming in as a query parameter for an python API endpoint. This mini query language had to support AND, OR and...
pyparsing
Parsing a mini query language with python and pyparsing
Recently, I had to parse an SQL-like statement coming in as a query parameter for an python API endpoint. This mini query language had to support AND, OR and...
uuid
Quick tip: Generating unique IDs in python
There are several cases where we need to generate a unique identifier in our applications. One way to do it is to roll your own implementation, usually rando...
solid
SOLID principles: Single responsibility
SOLID is a set of principles that lead to cleaner, more maintenable and extensible code. The first principle is the Single Responsibility Principle or SRP.
principles
SOLID principles: Single responsibility
SOLID is a set of principles that lead to cleaner, more maintenable and extensible code. The first principle is the Single Responsibility Principle or SRP.
memoization
Memoization in python
Memoization is loosely defined as an optimization technique that is usually applied on functions that are quite expensive to run.
queues
Queues in python
Queues are a really useful data structure that are being frequently used both in application code and are also utilized by libraries. In this post, we’ll see...
dependency-injection
Dependency injection in python
Dependency injection is a technique that “injects”/passes dependencies between objects in a way that leads to code that is easier to test and maintain.
testing
Property testing with hypothesis
Testing is a huge field and takes a significant amount of time to master. There are several types of tests, like unit, functional, integration, end-to-end (e...
flask
Send logs to logz.io from your Flask application
Logging is of great importance for web applications, both while in your local environment and for production applications. Logs can be analyzed and reveal is...
logzio
Send logs to logz.io from your Flask application
Logging is of great importance for web applications, both while in your local environment and for production applications. Logs can be analyzed and reveal is...
logs
Send logs to logz.io from your Flask application
Logging is of great importance for web applications, both while in your local environment and for production applications. Logs can be analyzed and reveal is...
cli
Awesome cli tools: HTTPie http client
We frequently find ourselves making http calls from the terminal: for testing out an external API we’re integrating into our projects, or for testing APIs we...
httpie
Awesome cli tools: HTTPie http client
We frequently find ourselves making http calls from the terminal: for testing out an external API we’re integrating into our projects, or for testing APIs we...
unittest
Mocking in python with autospec
Mocking and mocks are really useful when writing tests, as they allow isolating the test target from its dependencies, leading to less fragile tests.
mock
Mocking in python with autospec
Mocking and mocks are really useful when writing tests, as they allow isolating the test target from its dependencies, leading to less fragile tests.
autospec
Mocking in python with autospec
Mocking and mocks are really useful when writing tests, as they allow isolating the test target from its dependencies, leading to less fragile tests.
pytest
Quick tip: Easily identify failing parametrized test in pytest with pytest.param
Pytest is a great tool for writing and running tests in python. One of the features I find myself using a lot is parametrized tests.
parametrize
Quick tip: Easily identify failing parametrized test in pytest with pytest.param
Pytest is a great tool for writing and running tests in python. One of the features I find myself using a lot is parametrized tests.
migrations
Database migrations with Dbmate
There are some tools that are quite essentials for web applications. When working on the back end side of your application, you’ll most probably need to use ...
database
Database migrations with Dbmate
There are some tools that are quite essentials for web applications. When working on the back end side of your application, you’ll most probably need to use ...
sql
Database migrations with Dbmate
There are some tools that are quite essentials for web applications. When working on the back end side of your application, you’ll most probably need to use ...
sqlalchemy
Deleting and re-inserting a record in SQLAlchemy in the same transaction
Recently, I was puzzled with an issue while working on one of my projects. In an endpoint I was building, I had to delete an existing record of a table and c...
orm
Deleting and re-inserting a record in SQLAlchemy in the same transaction
Recently, I was puzzled with an issue while working on one of my projects. In an endpoint I was building, I had to delete an existing record of a table and c...
atexit
Cleanup functions using the atexit module
Recently, I was going through the documentation and codebase of a python package (specifically kafka-python) and was curious about how cleaning up resources ...
rails
New behavior when exiting activerecord transactions with return in Rails 7
Recently, I decided to upgrade one of my projects from Rails 6.0 to 7.0. After going through the changelogs of each release between 6.0 and 7.0 and through t...
activerecord
New behavior when exiting activerecord transactions with return in Rails 7
Recently, I decided to upgrade one of my projects from Rails 6.0 to 7.0. After going through the changelogs of each release between 6.0 and 7.0 and through t...
llm
Chat with a PDF file using Ollama and Langchain
As lots of engineers nowadays, about a year ago I decided to start diving deeper into LLMs and AI.
Chat with a PDF file using Ollama and Langchain
As lots of engineers nowadays, about a year ago I decided to start diving deeper into LLMs and AI.
hashing
Building a hash table in python
Recently, while I was reading about the implementation of Hash in ruby (similar to a dict in python) and wrote a simple implementation of a hash table in pyt...