Category:Python - Revision history

RobertBushman: Replaced content with "Category:Hacking"

2023-11-10T16:28:51Z

Replaced content with "Category:Hacking"

← Older revision		Revision as of 16:28, 10 November 2023
Line 1:		Line 1:
	[[Category:Hacking]]		[[Category:Hacking]]
	~~= buffering =~~
	~~Fix CLI buffering in Python with:~~
	~~<pre>~~
	~~$ python -u foo.py \| tee mylog.log~~
	~~</pre>~~

	~~"-u" means unbuffered, or something~~

	~~= Decorators =~~
	~~<syntaxhighlight lang="python" line>~~
	~~def my_decorator(func):~~
	~~def wrapper(args, *kwargs):~~
	~~print("Something is happening before the function is called.")~~
	~~func(args, *kwargs)~~
	~~print("Something is happening after the function is called.")~~
	~~return wrapper~~

	~~@my_decorator~~
	~~def say_hello():~~
	~~print("Hello!")~~

	~~say_hello()~~
	~~</syntaxhighlight>~~

	~~= Virtual Environments =~~

	~~<syntaxhighlight lang="bash">~~
	~~# Check Python version~~
	~~python3 --version~~

	~~# Check pip version~~
	~~pip3 --version~~

	~~# Install virtualenv~~
	~~pip3 install virtualenv~~

	~~# Install venv~~
	~~sudo apt install python3-venv~~

	~~# Navigate to your project directory~~
	~~cd ~/my_project/~~

	~~# Create virtual environment~~
	~~python3 -m venv myenv~~

	~~# Activate virtual environment~~
	~~source myenv/bin/activate~~

	~~# Now you can install packages~~
	~~pip install <your-package>~~

	~~# Deactivate when you're done~~
	~~deactivate~~

	~~</syntaxhighlight>~~

	~~= What Libs Have I? =~~
	~~<pre>~~
	~~$ pip freeze --local~~
	~~blinker==1.6.2~~
	~~click==8.1.7~~
	~~flask==2.3.3~~
	~~importlib-metadata==6.8.0~~
	~~itsdangerous==2.1.2~~
	~~Jinja2==3.1.2~~
	~~MarkupSafe==2.1.3~~
	~~werkzeug==2.3.7~~
	~~zipp==3.16.2~~
	~~</pre>~~

	~~= Package Info =~~
	* https://pypi.org/project/package-name/
	** eg: https://pypi.org/project/itsdangerous/
	~~= Datetime and Timestamp =~~
	~~<syntaxhighlight lang="python" line>~~
	~~from datetime import datetime, timezone~~
	~~import pytz~~

	~~print("When including time, use one of the following:")~~

	~~ts = 0~~
	~~good_dt = pytz.utc.localize(datetime.utcfromtimestamp(ts))~~
	~~print(f'pytz.utc.localize(datetime.utcfromtimestamp(ts)) = {good_dt}')~~

	~~ts = 0~~
	~~good_dt = datetime.fromtimestamp(ts, timezone.utc)~~
	~~print(f'datetime.fromtimestamp(ts, timezone.utc) = {good_dt}')~~

	~~dt_with_tz = good_dt~~
	~~good_ts = int(dt_with_tz.timestamp())~~
	~~print(f'int(dt_with_tz.timestamp()) = {good_ts}')~~

	~~now_dt = pytz.utc.localize(datetime.utcnow())~~
	~~now_ts = int(now_dt.timestamp())~~
	~~renow_dt = datetime.fromtimestamp(now_ts, timezone.utc)~~

	~~print()~~
	~~print(f'now_dt = pytz.utc.localize(datetime.utcnow()) = {now_dt}')~~
	~~print(f'now_ts = int(now_dt.timestamp()) = {now_ts}')~~
	~~print(f'now_dt = datetime.fromtimestamp(now_ts, timezone.utc) = {renow_dt}')~~

	~~now_ts = int(pytz.utc.localize(datetime.utcnow()).timestamp())~~
	~~print(f'now_ts = int(pytz.utc.localize(datetime.utcnow()).timestamp()) = {now_ts}')~~

	~~import time~~
	~~print(f'now_ts = int(time.time()) = {int(time.time())}')~~
	~~</syntaxhighlight>~~

	~~= Subclass =~~
	~~<syntaxhighlight lang="python" line>~~
	~~# Parent class~~
	~~class Vehicle:~~
	~~def __init__(self, brand, model):~~
	~~self.brand = brand~~
	~~self.model = model~~

	~~def display(self):~~
	~~print(f"This is a {self.brand} {self.model}.")~~

	~~# Child class~~
	~~class Car(Vehicle):~~
	~~def __init__(self, brand, model, doors):~~
	~~super().__init__(brand, model) # Call the __init__ of the parent class~~
	~~self.doors = doors~~

	~~# Overriding the display method of the parent class~~
	~~def display(self):~~
	~~super().display() # Call the display method of the parent class~~
	~~print(f"It has {self.doors} doors.")~~

	~~# Testing the classes~~
	~~vehicle = Vehicle("Toyota", "Camry")~~
	~~vehicle.display()~~

	~~car = Car("Honda", "Civic", 4)~~
	~~car.display()~~
	~~</syntaxhighlight>~~

RobertBushman: /* buffering */

2023-11-10T16:28:37Z

buffering

← Older revision		Revision as of 16:28, 10 November 2023
Line 7:		Line 7:

	"-u" means unbuffered, or something		"-u" means unbuffered, or something

			= Decorators =
			<syntaxhighlight lang="python" line>
			def my_decorator(func):
			def wrapper(args, *kwargs):
			print("Something is happening before the function is called.")
			func(args, *kwargs)
			print("Something is happening after the function is called.")
			return wrapper

			@my_decorator
			def say_hello():
			print("Hello!")

			say_hello()
			</syntaxhighlight>

	= Virtual Environments =		= Virtual Environments =

RobertBushman: /* Subclass */

2023-10-11T00:16:01Z

Subclass

← Older revision		Revision as of 00:16, 11 October 2023
Line 92:		Line 92:

	= Subclass =		= Subclass =
	<~~pre~~>		<syntaxhighlight lang="python" line>
	# Parent class		# Parent class
	class Vehicle:		class Vehicle:
Line 119:		Line 119:
	car = Car("Honda", "Civic", 4)		car = Car("Honda", "Civic", 4)
	car.display()		car.display()
	</~~pre~~>		</syntaxhighlight>

RobertBushman: /* Datetime and Timestamp */

2023-10-11T00:15:44Z

Datetime and Timestamp

← Older revision		Revision as of 00:15, 11 October 2023
Line 57:		Line 57:
	** eg: https://pypi.org/project/itsdangerous/		** eg: https://pypi.org/project/itsdangerous/
	= Datetime and Timestamp =		= Datetime and Timestamp =
	<syntaxhighlight lang="python" ~~lines~~>		<syntaxhighlight lang="python" line>
	from datetime import datetime, timezone		from datetime import datetime, timezone
	import pytz		import pytz
Line 90:		Line 90:
	print(f'now_ts = int(time.time()) = {int(time.time())}')		print(f'now_ts = int(time.time()) = {int(time.time())}')
	</syntaxhighlight>		</syntaxhighlight>

	= Subclass =		= Subclass =
	<pre>		<pre>

RobertBushman: /* Datetime and Timestamp */

2023-10-11T00:14:46Z

Datetime and Timestamp

@@ Line 57: / Line 57: @@
 ** eg: https://pypi.org/project/itsdangerous/
 = Datetime and Timestamp =
 <pre>
-When including time, use one of the following:
+# Parent class
-pytz.utc.localize(datetime.utcfromtimestamp(ts)) = 1970-01-01 00:00:00+00:00
+class Vehicle:
-datetime.fromtimestamp(ts, timezone.utc) = 1970-01-01 00:00:00+00:00
+    def __init__(self, brand, model):
-int(dt_with_tz.timestamp()) = 0
+        self.brand = brand
-now_dt = pytz.utc.localize(datetime.utcnow()) = 2023-09-24 00:01:12.141804+00:00
+car = Car("Honda", "Civic", 4)
-now_ts = int(now_dt.timestamp()) = 1695513672
+car.display()
 </pre>

RobertBushman: /* Virtual Environments */

2023-10-07T22:28:00Z

Virtual Environments

← Older revision		Revision as of 22:28, 7 October 2023
Line 18:		Line 18:
	# Install virtualenv		# Install virtualenv
	pip3 install virtualenv		pip3 install virtualenv

			# Install venv
			sudo apt install python3-venv

	# Navigate to your project directory		# Navigate to your project directory

RobertBushman: /* Datetime and Timestamp */

2023-09-24T00:02:01Z

Datetime and Timestamp

← Older revision		Revision as of 00:02, 24 September 2023
Line 60:		Line 60:
	int(dt_with_tz.timestamp()) = 0		int(dt_with_tz.timestamp()) = 0

	pytz.utc.localize(datetime.utcnow()) = 2023-09-~~23 17~~:33:18.~~399692~~+00:00		now_dt = pytz.utc.localize(datetime.utcnow()) = 2023-09-24 00:01:12.141804+00:00
	int(now_dt.timestamp()) = ~~1695490398~~		now_ts = int(now_dt.timestamp()) = 1695513672
	datetime.fromtimestamp(now_ts, timezone.utc) = 2023-09-~~23 17~~:33:18+00:00		now_dt = datetime.fromtimestamp(now_ts, timezone.utc) = 2023-09-24 00:01:12+00:00
			now_ts = int(pytz.utc.localize(datetime.utcnow()).timestamp()) = 1695513672
	</pre>		</pre>

RobertBushman: /* What Libs Have I? */

2023-09-23T18:15:16Z

What Libs Have I?

← Older revision		Revision as of 18:15, 23 September 2023
Line 37:		Line 37:

	= What Libs Have I? =		= What Libs Have I? =
	<~~syntaxhighlight lang="bash"~~>		<pre>
	$ pip freeze --local		$ pip freeze --local
	blinker==1.6.2		blinker==1.6.2
Line 48:		Line 48:
	werkzeug==2.3.7		werkzeug==2.3.7
	zipp==3.16.2		zipp==3.16.2
	</~~syntaxhighlight~~>		</pre>

	= Package Info =		= Package Info =

RobertBushman: /* What Libs Have I? */

2023-09-23T18:14:48Z

What Libs Have I?

← Older revision		Revision as of 18:14, 23 September 2023
Line 37:		Line 37:

	= What Libs Have I? =		= What Libs Have I? =
			<syntaxhighlight lang="bash">
			$ pip freeze --local
			blinker==1.6.2
			click==8.1.7
			flask==2.3.3
			importlib-metadata==6.8.0
			itsdangerous==2.1.2
			Jinja2==3.1.2
			MarkupSafe==2.1.3
			werkzeug==2.3.7
			zipp==3.16.2
			</syntaxhighlight>

	= Package Info =		= Package Info =

RobertBushman: /* What Libs Have I? */

2023-09-23T18:14:33Z

What Libs Have I?

← Older revision		Revision as of 18:14, 23 September 2023
Line 37:		Line 37:

	= What Libs Have I? =		= What Libs Have I? =
	~~<syntaxhighlight>~~
	~~$ pip freeze --local~~
	~~blinker==1.6.2~~
	~~click==8.1.7~~
	~~flask==2.3.3~~
	~~importlib-metadata==6.8.0~~
	~~itsdangerous==2.1.2~~
	~~Jinja2==3.1.2~~
	~~MarkupSafe==2.1.3~~
	~~werkzeug==2.3.7~~
	~~zipp==3.16.2~~
	~~</syntaxhighlight>~~

	= Package Info =		= Package Info =