使用 git status 時，會看到 「.pyc」的binary 檔案，或「.」開頭的隱藏檔，這些都不想自動加入到 git 裡。
希望 git 指令幫我們排除，只要在專案目錄裡放一個 .gitignore 檔案，並且設定想要忽略的規則就行了。如果這個檔案不存在，就手動新增它：
$ touch .gitignore
編輯這個檔案的內容：
# 檔案名稱 .gitignore
#built application files
*.apk
*.ap_
# files for the dex VM
*.dex
# Java class files
*.class
# generated files
bin/
gen/
# Local configuration file (sdk path, etc)
local.properties
# Windows thumbnail db
Thumbs.db
# OSX files
.DS_Store
# Android Studio
*.iml
.idea
#.idea/workspace.xml - remove # and delete .idea if it better suit your needs.
.gradle
build/
.navigation
captures/
output.json
#NDK
obj/
.externalNativeBuild
#Python
*.pyc
# hidden file
.*
# vi
*~
# 忽略所有附檔名是 .tmp 的檔案
*.tmp最後再透過下列的指令，套到所有的 git 專案，不用一個一個專案去設定 .gitignore 檔案。
There are certain files created by particular editors, IDEs, operating systems, etc., that do not belong in a repository. But adding system-specific files to the repo’s .gitignore is considered a poor practice. This file should only exclude files and directories that are a part of the package that should not be versioned (such as the node_modules directory) as well as files that are generated (and regenerated) as artifacts of a build process.
All other files should be in your own global gitignore file. Create a file called .gitignore in your home directory and add anything you want to ignore. You then need to tell git where your global gitignore file is.
Mac
git config --global core.excludesfile ~/.gitignore
Windows
git config --global core.excludesfile %USERPROFILE%\.gitignore
This will result in an entry in your .gitconfig that looks like this:
[core]
excludesfile = {path-to-home-dir}/.gitignore