dockerfile拉取python3.7镜像

docker构建python3.7镜像：https://zhuanlan.zhihu.com/p/137288195

FROM：需要什么环境

ENV：修改path，即增加/usr/local/bin这个环境变量

ADD：将本地代码放到虚拟容器中，它有两个参数，第一个是 .
，代表本地当前路径；第二个参数是/code，代表虚拟容器中的路径，即将本地项目的所有内容放到虚拟容器的/code目录下，以便在虚拟容器中运行代码

WORKDIR：指定工作目录，也就是刚才的/code，在虚拟容器中的目录

RUN：执行某些环境准备工作，docker容器中只有python3环境，还需要python的库，这里安装那些库

CMD：运行项目的命令行命令

打开python镜像地址
https://hub.docker.com/_/python
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点击红色部分出现：

#
# NOTE: THIS DOCKERFILE IS GENERATED VIA "apply-templates.sh"
#
# PLEASE DO NOT EDIT IT DIRECTLY.
#FROM buildpack-deps:bullseye# ensure local python is preferred over distribution python
ENV PATH /usr/local/bin:$PATH# http://bugs.python.org/issue19846
# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
ENV LANG C.UTF-8# runtime dependencies
RUN set -eux; \apt-get update; \apt-get install -y --no-install-recommends \libbluetooth-dev \tk-dev \uuid-dev \; \rm -rf /var/lib/apt/lists/*ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
ENV PYTHON_VERSION 3.7.13RUN set -eux; \\wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz"; \wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc"; \GNUPGHOME="$(mktemp -d)"; export GNUPGHOME; \gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys "$GPG_KEY"; \gpg --batch --verify python.tar.xz.asc python.tar.xz; \command -v gpgconf > /dev/null && gpgconf --kill all || :; \rm -rf "$GNUPGHOME" python.tar.xz.asc; \mkdir -p /usr/src/python; \tar --extract --directory /usr/src/python --strip-components=1 --file python.tar.xz; \rm python.tar.xz; \\cd /usr/src/python; \gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \./configure \--build="$gnuArch" \--enable-loadable-sqlite-extensions \--enable-optimizations \--enable-option-checking=fatal \--enable-shared \--with-system-expat \--with-system-ffi \--without-ensurepip \; \nproc="$(nproc)"; \make -j "$nproc" \
# setting PROFILE_TASK makes "--enable-optimizations" reasonable: https://bugs.python.org/issue36044 / https://github.com/docker-library/python/issues/160#issuecomment-509426916PROFILE_TASK='-m test.regrtest --pgo \test_array \test_base64 \test_binascii \test_binhex \test_binop \test_bytes \test_c_locale_coercion \test_class \test_cmath \test_codecs \test_compile \test_complex \test_csv \test_decimal \test_dict \test_float \test_fstring \test_hashlib \test_io \test_iter \test_json \test_long \test_math \test_memoryview \test_pickle \test_re \test_set \test_slice \test_struct \test_threading \test_time \test_traceback \test_unicode \' \; \make install; \\
# enable GDB to load debugging data: https://github.com/docker-library/python/pull/701bin="$(readlink -ve /usr/local/bin/python3)"; \dir="$(dirname "$bin")"; \mkdir -p "/usr/share/gdb/auto-load/$dir"; \cp -vL Tools/gdb/libpython.py "/usr/share/gdb/auto-load/$bin-gdb.py"; \\cd /; \rm -rf /usr/src/python; \\find /usr/local -depth \\( \\( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \-o \( -type f -a \( -name '*.pyc' -o -name '*.pyo' -o -name '*.a' \) \) \-o \( -type f -a -name 'wininst-*.exe' \) \\) -exec rm -rf '{}' + \; \\ldconfig; \\python3 --version# make some useful symlinks that are expected to exist ("/usr/local/bin/python" and friends)
RUN set -eux; \for src in idle3 pydoc3 python3 python3-config; do \dst="$(echo "$src" | tr -d 3)"; \[ -s "/usr/local/bin/$src" ]; \[ ! -e "/usr/local/bin/$dst" ]; \ln -svT "/usr/local/bin/$src" "/usr/local/bin/$dst"; \done# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
ENV PYTHON_PIP_VERSION 22.0.4
# https://github.com/docker-library/python/issues/365
ENV PYTHON_SETUPTOOLS_VERSION 57.5.0
# https://github.com/pypa/get-pip
ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/38e54e5de07c66e875c11a1ebbdb938854625dd8/public/get-pip.py
ENV PYTHON_GET_PIP_SHA256 e235c437e5c7d7524fbce3880ca39b917a73dc565e0c813465b7a7a329bb279aRUN set -eux; \\wget -O get-pip.py "$PYTHON_GET_PIP_URL"; \echo "$PYTHON_GET_PIP_SHA256 *get-pip.py" | sha256sum -c -; \\export PYTHONDONTWRITEBYTECODE=1; \\python get-pip.py \--disable-pip-version-check \--no-cache-dir \--no-compile \"pip==$PYTHON_PIP_VERSION" \"setuptools==$PYTHON_SETUPTOOLS_VERSION" \; \rm -f get-pip.py; \\pip --versionCMD ["python3"]