Mac OS X doesn't have apt-get. There is a package manager called Homebrew that is used instead. This command would be: brew install python. Use Homebrew to install packages that you would otherwise use apt-get for. The page I linked to has an up-to-date way of installing homebrew, but at present, you can install Homebrew as follows. Used to re-synchronize the package index files from their sources.

How Do I List All Available Packages? To list all the available packages, type the following.

apt-get is a command-line tool which helps in handling packages in Linux. Its main task is to retrieve the information and packages from the authenticated sources for installation, upgrade and removal of packages along with their dependencies. Here APT stands for the Advanced Packaging Tool.

Syntax:

Most Used Commands: You need to provide one of the commands below, if -h option is not used.

update : This command is used to synchronize the package index files from their sources again. You need to perform an update before you upgrade or dist-upgrade.
upgrade : This command is used to install the latest versions of the packages currently installed on the user’s system from the sources enumerated in /etc/apt/sources.list. The installed packages which have new packages available are retrieved and installed. You need to perform an update before the upgrade, so that apt-get knows that new versions of packages are available.
dselect-upgrade : This is used alongwith the Debian packaging tool, dselect. It follows the changes made by dselect to the Status field of available packages, and performs any actions necessary to realize that state.
dist-upgrade : This command performs the function of upgrade, and also handles changing dependencies with new versions of packages. If necessary, the apt-get command will try to upgrade important packages at the expense of less important ones. It may also remove some packages in this process.
install : This command is used to install or upgrade packages. It is followed by one or more package names the user wishes to install. All the dependencies of the desired packages will also be retrieved and installed. The user can also select the desired version by following the package name with an ‘equals’ and the desired version number. Also, the user can select a specific distribution by following the package name with a forward slash and the version or the archive name (e.g. ‘stable’, ‘testing’ or ‘unstable’). Both of these version selection methods have the potential to downgrade the packages, so must be used with care.
remove : This is similar to install, with the difference being that it removes the packages instead of installing. It does not remove any configuration files created by the package.
purge : This command removes the packages, and also removes any configuration files related to the packages.
check : This command is used to update the package cache and checks for broken dependencies.
download : This command is used to download the given binary package in the current directory.
clean : This command is used to clear out the local repository of retrieved package files. It removes everything but not the lock file from /var/cache/apt/archives/partial/ and /var/cache/apt/archives/.
autoremove : Sometimes the packages which are automatically installed to satisfy the dependencies of other packages, are no longer needed then autoremove command is used to remove these kind of packages.

Options:

–no-install-recommends : By passing this option, the user lets apt-get know not to consider recommended packages as a dependency to install.
–install-suggests : By passing this option, the user lets apt-get know that it should consider suggested packages as dependencies to install.
-d or –download-only : By passing this option, the user specifies that apt-get should only retrieve the packages, and not unpack or install them.
-f or –fix-broken : By passing this option, the user specifies that apt-get should attempt to correct the system with broken dependencies in place.
-m or –ignore-missing or –fix-missing : By passing this option, the user specifies that apt-get should ignore the missing packages ( packages that cannot be retrieved or fail the integrity check ) and handle the result.
–no-download : By passing this command, the user disables downloading for apt-get. It means that it should only use the .debs it has already downloaded.
-q or –quiet : When this option is specified, apt-get produces output which is suitable for logging.
-s or –simulate or –just-print or –dry-run or –recon or –no-act : This option specifies that no action should be taken, and perform a simulation of events that would occur based on the current system, but do not change the system.
-y or –yes or –assume-yes : During the execution of apt-get command, it may sometimes prompt the user for a yes/no. With this option, it is specified that it should assume ‘yes’ for all prompts, and should run without any interaction.
–assume-no : With this option, apt-get assumes ‘no’ for all prompts.
–no-show-upgraded : With this option, apt-get will not show the list of all packages that are to be upgraded.
-V or –verbose-versions : With this option, apt-get will show full versions for upgraded and installed packages.
–show-progress : With this option, apt-get will show user-friendly progress in the terminal window when the packages are being installed, removed or upgraded.
-b or –compile or –build : With this option, apt-get will compile/build the source packages it downloads.
–no-upgrade : With this option, apt-get prevents the packages from being upgraded if they are already installed.
–only-upgrade : With this option, apt-get will only upgrade the packages which are already installed, and not install new packages.
–reinstall : With this option, apt-get reinstalls the packages that are already installed, at their latest versions.
–auto-remove or –autoremove : When using apt-get with install or remove command, this option acts like running the autoremove command.
-h or –help : With this option, apt-get displays a short usage summary.
Output:
-v or –version : With this option, apt-get displays it’s current version number.
Output:

Note: apt-get command will return 0 for successful executions, and decimal 100 in case of errors.

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