本文介绍了如何使用Sublime Text编辑器创建并运行你的第一个Python程序。通过编写打印'hello, world'的简单代码，你将在终端看到输出。如果你的系统中没有Python 3，可以使用Homebrew进行安装，并通过它安装Python和virtualenv。"
131467031,9639234,Matlab整数运算指南：加减乘除与取余,"['Matlab', '数值计算', '开发语言']
写程序得先来个编辑器吧？ Sublime Text ，提到编辑器就想到它了，很不巧我没用，你觉得顺手就行，反正就这么一提，Sublime Text；
创建个.py后缀的文件：xxx.py;然后文件内写上第一行python代码，只需要一行就够了，按照国际惯例，因该是这样写的：
print('hello, world')
好啦，终端输入命令 python xxx.py Duang ~~~~终端上输出了一行字符串hello, world 成功了
//这是机子上已经安装的各个版本Python的目录：进入这里查看/System/Library/Frameworks/Python.framework/Versions；
目前我的机子没有3.x版本的Python，需要安装一下；那么此时我想到神器homebrew了。
机子安装homebrew，用homebrew安装python，用pip安装virtualenv
brew search python3#查看python3是否存在
brew install python3#安装python3
命令行安装Python3的过程：
$ brew search python3
==> Formulae
boost-python3 python3 python@3
$ brew install python3
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> New Formulae
buildkit gitleaks llvm@7 proper s2geometry
ccls go@1.11 mdbook protobuf@3.6 solr@7.7
ffsend kcov operator-sdk pyinstaller triangle
==> Updated Formulae
openssl ✔ glibmm nqp
abcm2ps glm nspr
ack glog nss
acpica gloox ntp
activemq glui ocamlbuild
adwaita-icon-theme gmic ocrmypdf
aide gmsh octave
allegro gmt odpi
amazon-ecs-cli gmt@4 opa
ammonite-repl gnome-builder opencoarrays
amqp-cpp gnome-latex openfortivpn
angular-cli gnupg openimageio
ansible gnuradio openrct2
anycable-go gnutls openvdb
apache-arrow go orc-tools
apache-arrow-glib go-statik ori
apachetop gobject-introspection osc
arangodb gocryptfs osm2pgsql
armadillo godep osquery
atk gomplate osrm-backend
atomist-cli googler oxipng
aubio goreleaser pandoc
auditbeat gosu pandoc-citeproc
autossh gpgme parallel
aws-sdk-cpp gr-osmosdr parallelstl
awscli gradle pcl
azure-cli grafana pdal
azure-storage-cpp graph-tool pdftoedn
baobab grpc percona-server
bartycrouch grv pgloader
bash gsettings-desktop-schemas pgrouting
bazel gssh php
bedtools gtk+3 php-code-sniffer
berkeley-db gtkmm3 php@7.1
bettercap gtksourceview3 php@7.2
binaryen gtksourceview4 phplint
bind gtranslator phpunit
bit gucharmap picard-tools
bitcoin gwyddion pius
bitrise hadolint plantuml
bitwarden-cli hapi-fhir-cli platformio
bnd harfbuzz podofo
boost hebcal points2grid
boost-bcp helmfile polyml
boost-build help2man ponyc
boost-mpi hg-fast-export postgis
boost-python highlight powerman
boost-python3 hledger ppsspp
bowtie2 homeassistant-cli presto
brew-gem homebank procyon-decompiler
btfs hub proj
bundletool i2pd prometheus
bzt imagemagick protobuf
c-blosc immortal prototool
cabextract influxdb proxychains-ng
caddy instead pspg
caffe ipython ptex
cataclysm istioctl pulledpork
cdk jasper pulumi
ceres-solver jenkins pumba
cfr-decompiler jenkins-lts pushpin
chakra jetty-runner pygobject3
chapel jid pypy
checkbashisms jpeg-turbo python
chezscheme json-fortran qalculate-gtk
chronograf jsonrpc-glib qt
cimg juju qxmpp
clamav julius r
cli53 kafka rabbitmq
clojure kallisto rakudo
clojurescript khal rakudo-star
cmake kibana rancher-cli
coffeescript krakend rawtoaces
compcert ktmpl rbenv
conan kubecfg rbspy
conserver kubeprod re-flex
consul kubernetes-cli rebar3
convox kubernetes-helm redis
coreutils kustomize redis@3.2
coturn languagetool redis@4.0
cppad lastpass-cli rke
cpprestsdk ledger rst-lint
cromwell leptonica rtags
crowdin leveldb ruby
csvkit lf ruby-build
cucumber-cpp lgogdownloader ruby@2.5
curl libbitcoin s3fs
curl-openssl libbitcoin-blockchain s3ql
datamash libbitcoin-client salt
dateutils libbitcoin-database scalariform
dav1d libbitcoin-explorer sceptre
dbhash libbitcoin-network scrcpy
dep libbitcoin-node scw
derby libbitcoin-protocol sdl2
digdag libbitcoin-server securefs
dlib libbluray serveit
dnscrypt-proxy libdazzle serverless
dnsviz libdill servus
docfx libdvdread sfcgal
docker libetpan shadowsocks-libev
docker-completion libfabric shapelib
docker-compose libgaiagraphics shellshare
doctl libgeotiff ship
doitlive libgosu shmux
double-conversion libgpg-error simple-scan
dovecot libgtop simple-tiles
dpkg libgweather singular
dropbear liblcf sip
dssim liblwgeom skaffold
duply libosinfo slackcat
dynare libosmium solr
easyengine libphonenumber source-highlight
easyrpg-player libpointing sourcery
efl libpulsar spatialite-gui
eiffelstudio libqalculate spatialite-tools
ejabberd librasterlite speedtest-cli
elasticsearch librdkafka sphinx-doc
embulk librealsense spigot
emscripten libsoundio spirv-cross
epic5 libsoup sqlcipher
erlang libspatialite sqldiff
eslint libssh2 sqlite
esptool libswiften sqlite-analyzer
etsh libtermkey stellar-core
exact-image libtins step
exempi libtommath sundials
exim libtorrent-rasterbar supersonic
exomizer libuv swagger-codegen@2
exploitdb libvirt swi-prolog
fades libyaml swiftformat
fastme libzip sxiv
fastqc lldpd taskell
fb-client llnode tbb
feh llvm telegraf
ffe logstash teleport
ffmpeg lolcat template-glib
fifechan lorem termtosvg
file-roller lsd terraform
fio ltc-tools terraform-inventory
flatcc lynis terragrunt
flow mandoc thors-serializer
fltk mapnik tmux-xpanes
flume mapserver tokei
fluxctl mariadb tomcat
fn mas tomcat@7
folly maxwell tomcat@8
fontforge mdcat topgrade
fonttools menhir traefik
fortio mercurial treefrog
fossil mesa typescript
fping metaproxy ucloud
freedink metricbeat uhd
freeipmi mgba unbound
freeradius-server micropython upscaledb
freetds mingw-w64 utf8proc
freetype minio v8
frugal minio-mc vala
fselect mint valabind
fstrm mitie vert.x
fuse-emulator mkl-dnn vifm
fuse-zip mkvtoolnix vim
futhark mlkit vim@7.4
fwup mmark vte3
fx moarvm vtk
fzf monero vulkan-headers
gammu monit vultr
gdal mono watchexec
gearboy mpfr wesnoth
gearsystem mutt whois
gedit mvnvm widelands
geocode-glib mvtools wildfly-as
geogram nano winetricks
geoserver nats-streaming-server wolfssl
gerbil-scheme nave wsk
getmail ncmpcpp wtf
gexiv2 nco xapian
gif2png ncview xcodegen
gifski needle xpa
ginac neo4j xxhash
git-annex netcdf yarn
git-cola netdata yelp-tools
git-fixup netpbm ykpers
git-flow-avh nghttp2 you-get
gitbucket nginx youtube-dl
github-keygen nicovideo-dl yq
gitlab-runner nifi zabbix
gjs nnn zenity
glib node zola
glib-networking node-build zurl
==> Renamed Formulae
gloo-ctl -> glooctl
==> Deleted Formulae
at-spi2-atk go@1.8 plan9port solr@5.5 zxing-cpp
at-spi2-core libutf protobuf@2.5 solr@6.6
go@1.4 monax protobuf@2.6 tmux-cssh
==> Installing dependencies for python: gdbm, openssl, readline, sqlite and xz
==> Installing python dependency: gdbm
==> Downloading https://homebrew.bintray.com/bottles/gdbm-1.18.1.mojave.bottle.1
######################################################################## 100.0%
==> Pouring gdbm-1.18.1.mojave.bottle.1.tar.gz
? /usr/local/Cellar/gdbm/1.18.1: 20 files, 586.8KB
==> Installing python dependency: openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2r.mojave.bottl
######################################################################## 100.0%
==> Pouring openssl-1.0.2r.mojave.bottle.tar.gz
==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
/usr/local/etc/openssl/certs
and run
/usr/local/opt/openssl/bin/c_rehash
openssl is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.
If you need to have openssl first in your PATH run:
echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile
For compilers to find openssl you may need to set:
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
==> Summary
? /usr/local/Cellar/openssl/1.0.2r: 1,795 files, 12.1MB
==> Installing python dependency: readline
==> Downloading https://homebrew.bintray.com/bottles/readline-8.0.0.mojave.bottl
######################################################################## 100.0%
==> Pouring readline-8.0.0.mojave.bottle.tar.gz
==> Caveats
readline is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only.
For compilers to find readline you may need to set:
export LDFLAGS="-L/usr/local/opt/readline/lib"
export CPPFLAGS="-I/usr/local/opt/readline/include"
==> Summary
? /usr/local/Cellar/readline/8.0.0: 48 files, 1.5MB
==> Installing python dependency: sqlite
==> Downloading https://homebrew.bintray.com/bottles/sqlite-3.27.2.mojave.bottle
######################################################################## 100.0%
==> Pouring sqlite-3.27.2.mojave.bottle.tar.gz
==> Caveats
sqlite is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.
If you need to have sqlite first in your PATH run:
echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile
For compilers to find sqlite you may need to set:
export LDFLAGS="-L/usr/local/opt/sqlite/lib"
export CPPFLAGS="-I/usr/local/opt/sqlite/include"
==> Summary
? /usr/local/Cellar/sqlite/3.27.2: 11 files, 3.7MB
==> Installing python dependency: xz
==> Downloading https://homebrew.bintray.com/bottles/xz-5.2.4.mojave.bottle.tar.
######################################################################## 100.0%
==> Pouring xz-5.2.4.mojave.bottle.tar.gz
? /usr/local/Cellar/xz/5.2.4: 92 files, 1MB
==> Installing python
==> Downloading https://homebrew.bintray.com/bottles/python-3.7.3.mojave.bottle.
######################################################################## 100.0%
==> Pouring python-3.7.3.mojave.bottle.tar.gz
==> /usr/local/Cellar/python/3.7.3/bin/python3 -s setup.py --no-user-cfg install
==> /usr/local/Cellar/python/3.7.3/bin/python3 -s setup.py --no-user-cfg install
==> /usr/local/Cellar/python/3.7.3/bin/python3 -s setup.py --no-user-cfg install
==> Caveats
Python has been installed as
/usr/local/bin/python3
Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
/usr/local/opt/python/libexec/bin
If you need Homebrew's Python 2.7 run
brew install python@2
You can install Python packages with
pip3 install <package>
They will install into the site-package directory
/usr/local/lib/python3.7/site-packages
See: https://docs.brew.sh/Homebrew-and-Python
==> Summary
? /usr/local/Cellar/python/3.7.3: 3,863 files, 59.8MB
==> Caveats
==> openssl
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
/usr/local/etc/openssl/certs
and run
/usr/local/opt/openssl/bin/c_rehash
openssl is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.
If you need to have openssl first in your PATH run:
echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile
For compilers to find openssl you may need to set:
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
==> readline
readline is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only.
For compilers to find readline you may need to set:
export LDFLAGS="-L/usr/local/opt/readline/lib"
export CPPFLAGS="-I/usr/local/opt/readline/include"
==> sqlite
sqlite is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.
If you need to have sqlite first in your PATH run:
echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile
For compilers to find sqlite you may need to set:
export LDFLAGS="-L/usr/local/opt/sqlite/lib"
export CPPFLAGS="-I/usr/local/opt/sqlite/include"
==> python
Python has been installed as
/usr/local/bin/python3
Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
/usr/local/opt/python/libexec/bin
If you need Homebrew's Python 2.7 run
brew install python@2
You can install Python packages with
pip3 install <package>
They will install into the site-package directory
/usr/local/lib/python3.7/site-packages
See: https://docs.brew.sh/Homebrew-and-Python
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