pip是特定于Python的软件包管理器，默认情况下，在许多系统上未安装该软件包管理器.

pip is a package manager specific to Python, and is not installed by default on many systems.

因此，您首先需要安装pip.假设您正在使用raspbian，则需要使用apt-get命令，该命令是基于Debian的Linux系统(例如raspbian)的通用软件包管理器:

So you first need to install pip. Assuming you are using raspbian, you need to use the apt-get command, which is the general-purpose package manager for Debian-based Linux systems such as raspbian:

sudo apt-get install python3-pip

或Python 2版本:

or the Python 2 version:

sudo apt-get install python-pip

然后，您应该能够使用pip安装Python软件包，例如twilio.

then you should be able to install Python packages such as twilio using pip.

请参阅Raspberry Pi 安装Python软件包的指南.

See the Raspberry Pi guide for installing Python packages.