#python

 

2023-12-15

itertools

import:: import itertools

# python

2023-09-24

functions

doc:: [内置函数](https://docs.python.org/zh-cn/3/library/functions.html)

# python
# library

2023-09-15

os

- import:: import os - doc:: [library/os](https://docs.python.org/zh-cn/3/library/os.html) ...

# python
# library

2023-09-11

tomllib

- import:: import tomlib - doc:: [tomllib](https://docs.python.org/zh-cn/3/library/tomllib....

# python
# toml

2023-09-11

with

doc:: [with 语句](https://docs.python.org/zh-cn/3.12/reference/compound_stmts.html#the-with...

# python
# 复合语句

2023-08-03

hexdigest

import:: import hashlib

# python
# library

2023-07-14

update_kuma-api

- install:: `pip install uptime-kuma-api` - import:: `from uptime_kuma_api import UptimeKum...

# python
# update

2023-05-13

miniconda

## 安装配置

# python
# package-manager

2023-04-11

circle

`cv2.circle(img, center, redius, color, thickness, lineType, shift)`

# python
# opencv

2023-04-11

imread

import::

# python
# opencv

2023-04-11

rectangle

`cv2.rectangle(img, pt1, pt2, color, thickness, lineType, shift)`

# python
# opencv

2023-04-04

calendar

- import:: import calendar - doc:: [calendar](https://docs.python.org/zh-cn/3/library/calen...

# python
# library

2023-04-04

openpyxl

install:: pip 3 install openpyxl

# python
# pip
# xlsx

2023-03-19

ctx

# python
# sanic

2023-03-19

shared_ctx

shared_ctx 类似于 [[ctx]]，可以在应用程序的整个生命周期内共享状态，不同的是 shared_ctx 可以...

# python
# sanic

2023-03-08

Image

import:: doc::

# python
# pil

2023-03-08

DataFrame

doc:: [DataFrame](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.html)

# python
# pandas

2023-03-08

pandas

import::

# python
# pandas

2023-03-07

listeners

监听器添加方式

# python
# sanic

2023-02-13

black

- install:: pip3 install black - use:: black file.py - github:: [psf/black](https://github....

# python
# CodeFormatter
# cli

2023-02-13

mypy

- install:: pip3 install mypy - use:: mypy file.py - github:: [python/mypy](https://github....

# python
# pip

2023-02-11

copy

import:: import copy

# python
# library

2023-02-07

uuid

use:: `import uuid`

# python
# library
# uuid

2023-02-05

一行流

## if

# python

2023-01-01

logging

```python import logging from logging.handlers import RotatingFileHandler

# python
# library
# log

2022-12-22

aiohttp

install:: pip3 install aiohttp

# python
# httpserver
# http

2022-12-21

datetime

import:: import datetime

# python
# library
# time

2022-12-21

时间计算

### datatime 时间计算

# python
# time

2022-12-21

时间转换

- 时间戳: - 转字符串 - 转时间元组 - 字符串 - 转时间戳 - 转时间元组 - 时间元...

# python
# time

2022-12-15

collections

- import:: import collections - doc:: [collections](https://docs.python.org/zh-cn/3/library...

# python
# library
# 容器

2022-12-15

enum

import:: import enum

# python
# library

2022-12-11

re

import:: `import re`

# python
# library
# 文本处理

2022-12-11

textwrap

import:: import textwrap

# python
# library
# 文本

2022-12-07

pynvml

- use:: import pynvml - install:: pip3 install nvidia-ml-py3 - github:: nicolargo/nvidia-ml...

# python
# pip
# NVIDIA

2022-11-29

multiprocessing

- import:: import multiprocessing - doc:: [multiprocessing](https://docs.python.org/zh-cn/3...

# python
# library
# 进程

2022-11-29

queue

- import:: `import queue` - doc:: [queue](https://docs.python.org/zh-cn/3/library/queue.htm...

# python
# library
# 并发

2022-11-26

concurrent

## futures

# python
# library
# 并发

2022-11-23

如何返回 IP

```python from flask import Flask, request, jsonify

# python
# flask
# web

2022-11-23

最小 Flask 实例

```python # 一个最小的 Flask 应用 app = Flask(__name__)

# python
# flask
# web

2022-11-23

随机密码生成

```python import sys import string import secrets

# python
# snippet
# secrets

2022-11-21

字典合并

```python x = { "a": 1, "b": 2, } y = { "z": 42 } ```

# python
# dict

2022-10-27

SQLAlchemy 查询返回字典的两种方法

### 使用 __dict__ 方法

# python
# sqlalchemy
# 数据库

2022-09-23

sorted

import::

# python
# library

2022-09-22

try...except

doc:: []()

# python
# library
# 异常

2022-08-16

difflib

import:: import difflib

# python
# library
# text

2022-06-30

蛇形转大驼峰

```python def snake_to_pascal(word): """蛇形转大驼峰"""

# python

2022-06-06

装饰器

- 使用方法（语法糖） - 带参数 - 类

# python
# 语法糖

2022-05-31

类型注解

在 [[Python]] 中类型注解不会进行额外的效验。

# python

2022-05-26

ElementTree

import:: `import xml.etree.ElementTree as ET`

# python
# library
# xml

2022-05-07

flask-socketio

install :: `pip install flask-socketio`

# python
# flask
# websocket

2022-04-28

csv

import:: `import csv`

# python
# library
# csv

2022-04-28

sqlalchemy

- install:: `pip install sqlalchemy` - import:: `import sqlalchemy` - github:: [sqlalchemy/...

# python
# pip
# MySQL

2022-04-26

selectROI

- `cv2.selectROI(windowName, img, showCrosshair=None, fromCenter=None)` - windowName: ...

# python
# opencv
# roi

2022-04-25

pickle

import:: `import pickle`

# python
# library

2022-04-24

dict

`dict1.pop('name')` 删除指定键

# python
# library
# dict

2022-04-24

pprint

import:: from pprint import pprint

# python
# library

2022-04-17

pathlib

- doc:: [library/pathlib](https://docs.python.org/zh-cn/3/library/pathlib.html) - desc:: 系...

# python
# library
# path

2022-04-16

argparse

- import:: import argparse - doc:: [argparse](https://docs.python.org/zh-cn/3/library/argpa...

# python
# library
# cli

2022-04-08

pymysql

- [pymysql: 给 sql 语句传递字典参数 | Jeremy's blog](https://isyin.cn/note/2018-10-25-2121/...

# python
# pip
# mysql

2022-04-01

OCR

- [[paddleocr]] - 支持 [[pip]]、[[Docker]]、[[Linux|命令行]] - 非 Docker 部署，需 [...

# python
# ocr

2022-03-29

math

### 数字

# python
# library

2022-03-29

str

doc:: [str](https://docs.python.org/zh-cn/3/library/stdtypes.html#str)

# python
# library
# str

2022-03-29

time

import:: import time

# python
# library
# 时间和日期

2022-03-29

concurrency

## 并发

# python

2022-03-29

filesys

## 函数

# python
# os

2022-03-27

args

import::

# python
# library
# cli

2022-03-27

click

- install:: - import:: - github:: - doc::

# python
# pip
# cli

2022-03-17

CSV 转字典

```python import csv

# python
# csv
# excel

2022-02-16

Flask SQLAlchemy

## 查询

# python
# flask
# SQLAlchemy

2022-02-01

如何合并列表

### 如何合并列表

# python
# howto
# list

2022-02-01

如何在写入数据时换行

在行尾插入==\n==

# python
# howto
# open

2022-02-01

如何在字符串中插入变量

```python # 方式一 var = 'Hello {0}'.format('World') # 方式二 var = 'Hello {name}'.format(n...

# python
# howto

2022-02-01

如何把列表转换为字符串

- `''.join(<list>)`：可指定任意间隔字符（无法转换 int 类型列表） - `''.join([sgr(_) for _ i...

# python
# howto
# join

2022-02-01

如何把字典指定字段写入到 CSV

假设有个字典 x 有 a、b、c、d 四个键值对，但我们只需要其中的 a 和 d。

# python
# howto
# csv

2022-02-01

如何清除 open 的空行

使用 `<line>.strip()`清除

# python
# howto
# strip

2022-02-01

如何直接从字典中获取键或值

```python dict = {'num': 42}

# python
# howto
# dict

2022-02-01

如何获取 Bash 命令返回值

```python import os

# python
# howto
# sh

2022-02-01

如何获取字典中的第一个键

- `list(<dict>.keys())[0]`：获取字典的键，然后使用 #list 转换为列表并取第一个值 ---

# python
# howto
# list

2022-01-01

jinja2

定界符

# python
# flask