Codesarray

Python singleton pattern: one decorator. 🐍 @cache on get_config() -> body runs once a is b -> True #Python #Coding

Full video, Design patterns:

Python strategy pattern: just pass a function, in 4 images. 🐍 #Python #Coding

Full video, Design patterns:

Python strategy pattern: just pass a function. 🐍 checkout(40, sale) -> 32.0 checkout(40, lambda p: p - 10) -> 30 #Python #Coding

Full video, Design patterns:

Python design patterns, in 4 images. 🐍 Strategy is a function you pass in. A factory is a dict from a name to a function. Observer is a list of functions. #Python #Coding

Full video:

Python timeit.repeat: take the min, not the average, in 4 images. 🐍 #Python #Coding

Full video, Profiling and performance:

Python timeit.repeat: take the min, not the average. 🐍 repeat(..., repeat=5) -> 133, 108, 193, 155, 141 ms min(runs) -> 108 ms #Python #Coding

Full video, Profiling and performance:

Python profiling and performance, in 4 images. 🐍 timeit compares small pieces of code. cProfile shows where a program spends time: read tottime first. #Python #Coding

Python @property is a descriptor: a class with __get__, in 4 images. 🐍 #Python #Coding

Full video:

Full video, Descriptors and metaclasses:

Python __slots__: 100,000 objects, 10 MB down to 6. 🐍 class Slim: __slots__ = ("x", "y") No dict per object. #Python #Coding

Python lazy import (3.15) loads a module on first use, in 4 images. 🐍 #Python #Coding

Python @property is a descriptor: a class with __get__ you can write yourself. 🐍 def __get__(self, obj, owner): return self.fget(obj) Runs on every read. #Python #Coding

Full video, Memory model and garbage collection:

Full video, The import system:

Full video, Descriptors and metaclasses:

Python memory management, in 4 images. 🐍 Reference counting frees most objects at once, and the garbage collector catches the cycles it misses. #Python #Coding

Python lazy import (3.15): the module loads on first use. 🐍 lazy import json "json" in sys.modules -> False json.dumps([1, 2]) "json" in sys.modules -> True #Python #Coding

Python descriptors, in 4 images. 🐍 An object on the class with __get__ and __set__ runs when you read or assign an attribute. property is built from one. #Python #Coding

Full video:

Full video, The import system:

Full video:

Python free threading: the GIL is optional in 3.14, in 4 images. 🐍 #Python #Coding

Python import system in one idea: import checks sys.modules first, so a module runs once. 🐍 → then sys.path, first match wins → circular import? import the module, use it later → lazy import is coming in 3.15 #Python #Coding

Python __slots__: 10 MB becomes 6 MB for 100,000 objects, in 4 images. 🐍 #Python #Coding

Full video, Threads, processes and free threading:

Watch it here: Next up: profiling and performance.

Full video, Memory model and garbage collection: