bc 命令 交互模式 bc无参数,默认进入交互模式。 然后输入算式后回车,即计算结果。 示例: ~ % bc >>> 1+1 2 或使用管道, 单行计算 示例: echo "1+1" | bc
字符串方法"A".rjust(10) # 右侧加空格 "A".ljust(10,"-") # 右侧加横线 "A".center(10,"=") # 两端加等号 f-strings 语法右侧加字符 width = 15 padding = ' ' print(f'{"I am legend" :{padding}<{width}}') 左侧加字符
以下代码适用于 bash 和 zsh: # 此脚本文件的绝对路径 SCRIPT_FILE=$(readlink -f $0) # 此脚本文件所在文件夹的绝对路径 SCRIPT_DIR=$(dirname $SCRIPT_FILE) # 注意:这两行要分开写,不要合并成一句,否则变量内容为空
能够获悉用户ID和会话ID的两个交互场景和方法: 消息交互 等待用户主动发消息给机器人 当用户在 Mixin Messenger 中 添加机器人为联系人时,会自动的发送一条内容是
Mixin 机器人如何获得使用过本机器人的所有用户呢? 并没有直接的API方法获得。需要开发者在用户和机器人交互时获得用户信息,并进行保存和管理。 参考 Mixin
准备会话ID若需要给每个用户逐一发送消息(群发消息),就是发送消息到每个会话ID (Conversation ID)。而这份会话ID列表需要自己提前准备好,参考 Mixin 机器人
import nacl.signing import nacl.public def generate_ed25519_keypair(): "return (public_key, private_key)" signing_key = nacl.signing.SigningKey.generate() pk = signing_key.verify_key._key sk = signing_key._signing_key return (pk, sk) def generate_curve25519_keypair(): "return (public_key, private_key)" sk = nacl.public.PrivateKey.generate() pk = sk.public_key return (pk, sk)
本文章引用自: https://www.educative.io/edpresso/installing-pip3-in-ubuntu ,版权归原作者所有。 pip3 is the official package installer for Python 3. It can be used to install packages from the Python Package Index. Installation Step 1 - Update systemIt is always a good idea to update before trying to install a new package. Run the command below: sudo apt update Step 2 - Install
可以使用 t (target) 选项来指定安装的位置。 举例: pip install -r requirements.txt -t /path/to/directory 安装到当前路径: pip install -r requirements.txt -t . 参考 https://pip.pypa.io/en/stable/reference/pip_install/#cmdoption-t
如何显示? import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face