Python packages
Python packages
Bast Python project dir structure
project_root/
my_project/
__init__.py
main.py
config.py
utils/
__init__.py
helper.py
features/
__init__.py
feature_a/
__init__.py
module1.py
module2.py
feature_b/
__init__.py
...
Python profiler
Python profiler
性能分析和代码优化
cProfile
cProfile 是 Python 内置的性能分析器，适用于对整个程序进行性能分析。
python
import cProfile
def my_function():
# Your function code here
for i in range(10000):
pass
cProfile.run(‘my_function()’)
line_profiler
line_profiler 是一个用于逐行分析 Python 代码性能的工具。需要先安装：
sh
pip install line_profiler
使用方法：
python
from...
Comprehension
Comprehension
List Comprehension:
# Basic list comprehension
new_list = [expression for item in iterable if condition]
# Example:
numbers = [1, 2, 3, 4, 5]
squared = [x**2 for x in numbers if x % 2 == 0] # squares of even numbers
Set Comprehension:
# Basic set comprehension
new_set = {expression for item in iterable if condition}
# Examp...
Python Magic methods
Python Magic methods
Initialization and Representation
__init__(self, ...): Object constructor, initializes the object.
__del__(self): Object destructor, called when the object is about to be destroyed.
__repr__(self): Defines the "official" string representation of an object, used by repr() and in debugging.
__str__(self): Defines the "inform...
cache
cache
LRUCache (Least Recently Used Cache)
Eviction Policy: Evicts the least recently used items first when the cache reaches its maximum size.
Usage: Useful when you want to keep the most recently accessed items in the cache.
RRCache (Random Replacement Cache)
Eviction Policy: Randomly evicts cache entries when the...
Java Memory Model
Java Memory Model
Reference
Java Memory Model: A Comprehensive Guide
[Java memory model](https://en.wikipedia.org/wiki/Java_memory_model#:~:text=The%20Java%20Memory%20Model%20(JMM,consistent%20and%20reliable%20Java%20applications.)
Java Memory Model in 10 minutes
463 post articles, 58 pages.