Jacob Padilla
@jpjacobpadilla
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I’m an NYU Stern student, photographer, open-source developer, and blogger. Projects: Photography & Articles 👇
NYC / Boston
Joined October 2021
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🐍
#Python
tip:
Want to print out a specific month's calendar? Use Python's built-in calendar module!
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🐍
#Python
Tip:
You can use the assignment expression (walrus operator :=) in while loops to both get input and check conditions in a single line!
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The requests package is excellent, but it has no Asyncio support :(
HTTPX uses an API similar to the requests package but does have Asyncio and HTTP2 support!
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In
#Python
3.12 you can use itertools.batched() to batch iterables into smaller, more manageable chunks!
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#Python
tip: Ever wondered how to dynamically retrieve the source code of a function? Use inspect.getsource() (it returns a string)!
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Does anyone here use Selenium?
Well if you do, you can now easily use it in Google Colab Notebooks!
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By default, Pandas opts for float64 and int64 for numerical columns, which isn't always memory-efficient.
If you know your data's range, you may want to consider using the dtype argument to optimize memory usage when loading data.
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Enum classes in
#Python
make your code more readable! Define categories with the Enum Python module and use auto() for automatic numbering.
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Simplify your resource management in
#Python
with multiple context managers in a single 'with' statement. 🛠️🐍
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Don't forget about the else statement in
#Python
for-loops!
If you don't break out of the loop, the code inside of the else statement will be executed!e
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Control the number of threads accessing a shared resource concurrently with a
#Python
semaphore!
In the example, every instance of the "MyThread" class represents an individual thread. All these instances can access the shared class variable "semaphore". This variable is an
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Harnessing the * operator in Python! 🐍
a gets the first item
*b collects all middle items
c gets the last!
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🐍
#Python
Tip of the Day:
To sort a list of tuples based on the second element, use the sorted() function with a lambda key:
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Easily figure out if something is a file or a directory using the
#pathlib
module from the Python Standard Library 🐍
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Here's another urllib.parse function: it turns the query string part of a URL into a dictionary!
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🐍
#Python
tip:
Want to print your JSON data with proper indentation? Use the JSON module!
This will display your JSON beautifully indented!
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#Python
tip 🐍
You can use the zip() function to combine lists together and turn them into dictionaries!
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Go read my article on how to efficiently debug your code with Git bisect!
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The reduce function in
#Python
can be very useful for applying a function in a step-by-step manner.
Great for merging many Pandas DataFrames together!
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Did you know you can make an asynchronous list comprehensions in Python?
#Python
#pythonprogramming
#Asyncio
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Handle async timeouts gracefully in
#Python
with asyncio's wait_for function! ⏱️🐍
#AsyncProgramming
#CodeTips
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#PYTHON
QUIZ:
COMMENT what the code in the image prints!
#programming
#developer
#softwaredeveloper
#webdev
#pythonprogramming
#pythonquiz
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#Python
tip:
Use the glob module to search for files! 📂
In this example, I'm searching for all .py files in the directory that this Python code is running in:
#coding
#programming
#developer
#codeTips
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#Python
dunder methods you should know for making custom classes:
> __init__ & __new__:
For object initialization and creation.
obj = MyClass(args)
> __str__:
String representation of object.
str(obj)
> __repr__:
Official representation.
repr(obj)
> __add__:
Addition
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Using contextlib.closing with
#SQLite
ensures database connections are always properly closed, even if exceptions occur!
#pythonprogramming
#python
#SQL
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Learn how to use Argon2 for password hashing, store user data in an SQLite database, and manage sessions effectively with signed cookies!
#Python
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Go checkout my new article - a comprehensive guide to creating and organizing custom exceptions in Python!
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🐍
#Python
Tip:
Did you know you can use defaultdict with a lambda function to set custom default values?
In this example, any non-existent key returns the string 'Jacob'.
It's a powerful way to customize your dictionary's behavior!
#PythonTips
#FlexibilityInCode
💡
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@Python_Dv
But what if you intentionally want to throw an exception if “age” is not in the dictionary…
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How to make your own context managers in
#Python
I’m talking about the “with something as obj” statements.
You just need to add __enter__ and __exit__ to your classes!
Read how __enter__ & __exit__ actually work 👇
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@driscollis
Interesting! I’ve never used this before. What would the use case be for using this over a higher level package like Flask and a lower level thing like Asyncio streams?
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#Python
&
#SQLAlchemy
tip:
You can set the isolation level of a Connection from Engine.connect(). See image for example!
Possible values:
"AUTOCOMMIT"
"READ COMMITTED"
"READ UNCOMMITTED"
"REPEATABLE READ"
"SERIALIZABLE"
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Quick
#Python
Tip:
You can send values to generators!
After sending the value to the generator, Python will execute the code until the next yield statement.
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So just to be clear, port would not be None if there was a specific port after the domain.
Example: 127.0.0.1:5000 would return a port of 5000.
However, if port is None, you can infer the port via the scheme:
443 = https
80 = http
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@driscollis
My favorite pip command is probably “pip show [package]”. Has come in handy a few times!
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@saxboatsec
It’s pretty handy!
Although, I generally just use the glob method from pathlib these days.
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Which way do you run code inside a
#Python
virtual environment?
METHOD 1:
$ source venv/bin/activate
$ python
METHOD 2:
$ venv/bin/python
Method 1
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Method 2
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In
#Python
, wrapping one object over another can result in the loss of valuable metadata; that's why using functools.wraps is crucial when developing your own Python decorators!
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Learn how to scrape dynamic & static data:
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Learn how to deploy Uptime Kuma on Google Cloud's free Virtual Machines with Docker, monitor websites, and configure instant Slack alerts for site issues.
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@bill2bond
As far as I know, you can only use Headless Selenium in Google Colab since their is no GUI support on GC.
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@GunalanD95
So you know how you can use a with statement with a single context manager like such:
with Object as o:
[code]
Sometimes you may need to nest context managers like:
with ObjectA as a:
with ObjectB as b:
[code]
Well you can actually combine the first two lines!
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@akshay_pachaar
@driscollis
Nice post! I’m curious how the two tables are actually joined together? Are both columns hashed and then joined? Is it a nested loop join? Merge join?
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