dockerfile 如下

FROM rlesouef/alpine-python-3.5
RUN echo -e "https://mirrors.aliyun.com/alpine/v3.7/main" > /etc/apk/repositories && \
    apk --update add \
    bash \
    vim \
    curl \
    git \
    libxml2 \
    libxml2-dev \
    libxslt \
    libxslt-dev \
    python3 \
    python3-dev \
    postgresql-dev \
    mysql-dev \
    build-base  && \
    pip3 install -U pip && \
    rm -rf /var/cache/apk/*

意思就是，修改alpine 安装源，修改pip 安装源