`
pi@raspberry:~ $ which python
/usr/bin/python
pi@raspberry:~ $ which python2
/usr/bin/python2
pi@raspberry:~ $ which python2.7
/usr/bin/python2.7
pi@raspberry:~ $ dpkg -l|grep python
ii dh-python 1.20141111-2 all Debian helper tools for packaging Python libraries and applications
ii idle-python2.7 2.7.9-2 all IDE for Python (v2.7) using Tkinter
ii idle-python3.4 3.4.2-1 all IDE for Python (v3.4) using Tkinter
ii libpython-dev:armhf 2.7.9-1 armhf header files and a static library for Python (default)
ii libpython-stdlib:armhf 2.7.9-1 armhf interactive high-level object-oriented language (default python version)
ii libpython2.7:armhf 2.7.9-2 armhf Shared Python runtime library (version 2.7)
ii libpython2.7-dev:armhf 2.7.9-2 armhf Header files and a static library for Python (v2.7)
ii libpython2.7-minimal:armhf 2.7.9-2 armhf Minimal subset of the Python language (version 2.7)
ii libpython2.7-stdlib:armhf 2.7.9-2 armhf Interactive high-level object-oriented language (standard library, version 2.7)
ii libpython3-dev:armhf 3.4.2-2 armhf header files and a static library for Python (default)
ii libpython3-stdlib:armhf 3.4.2-2 armhf interactive high-level object-oriented language (default python3 version)
ii libpython3.4:armhf 3.4.2-1 armhf Shared Python runtime library (version 3.4)
ii libpython3.4-dev:armhf 3.4.2-1 armhf Header files and a static library for Python (v3.4)
ii libpython3.4-minimal:armhf 3.4.2-1 armhf Minimal subset of the Python language (version 3.4)
ii libpython3.4-stdlib:armhf 3.4.2-1 armhf Interactive high-level object-oriented language (standard library, version 3.4)
ii python 2.7.9-1 armhf interactive high-level object-oriented language (default version)
ii python-apt 0.9.3.12 armhf Python interface to libapt-pkg
ii python-apt-common 0.9.3.12 all Python interface to libapt-pkg (locales)
ii python-chardet 2.3.0-1 all universal character encoding detector for Python2
ii python-chardet-whl 2.3.0-1 all universal character encoding detector
ii python-colorama 0.3.2-1 all Cross-platform colored terminal text in Python - Python 2.x
ii python-colorama-whl 0.3.2-1 all Cross-platform colored terminal text in Python - Wheels
ii python-dbus 1.2.0-2+b1 armhf simple interprocess messaging system (Python interface)
ii python-dbus-dev 1.2.0-2 all main loop integration development files for python-dbus
ii python-dev 2.7.9-1 armhf header files and a static library for Python (default)
ii python-distlib 0.1.9-1 all low-level components of python distutils2/packaging
ii python-distlib-whl 0.1.9-1 all low-level components of python distutils2/packaging
ii python-gi 3.14.0-1 armhf Python 2.x bindings for gobject-introspection libraries
ii python-gobject-2 2.28.6-12 armhf deprecated static Python bindings for the GObject library
ii python-gpiozero 1.1.0 all Simple API for controlling devices attached to the GPIO pins.
ii python-html5lib 0.999-3 all HTML parser/tokenizer based on the WHATWG HTML5 specification (Python 2)
ii python-html5lib-whl 0.999-3 all HTML parser/tokenizer based on the WHATWG HTML5 specification
ii python-minimal 2.7.9-1 armhf minimal subset of the Python language (default version)
ii python-pifacecommon 4.2.1-1 all The PiFace common functions module.
ii python-pifacedigitalio 3.1.0-1 all The PiFace Digital I/O module.
ii python-pip 1.5.6-5 all alternative Python package installer
ii python-pip-whl 1.5.6-5 all alternative Python package installer
ii python-pkg-resources 5.5.1-1 all Package Discovery and Resource Access using pkg_resources
ii python-pyasn1 0.1.7-1 all ASN.1 library for Python (Python 2 module)
ii python-requests 2.4.3-6 all elegant and simple HTTP library for Python2, built for human beings
ii python-requests-whl 2.4.3-6 all elegant and simple HTTP library for Python, built for human beings
ii python-rpi.gpio 0.6.1-1 armhf Python GPIO module for Raspberry Pi
ii python-serial 2.6-1.1 all pyserial - module encapsulating access for the serial port
ii python-setuptools 5.5.1-1 all Python Distutils Enhancements
ii python-setuptools-whl 5.5.1-1 all Python Distutils Enhancements (wheel package)
ii python-six 1.8.0-1 all Python 2 and 3 compatibility library (Python 2 interface)
ii python-six-whl 1.8.0-1 all Python 2 and 3 compatibility library (universal wheel)
ii python-spidev 2.0~git20150907 armhf Python bindings for Linux SPI access through spidev (Python 2)
rc python-support 1.0.15 all automated rebuilding support for Python modules
ii python-talloc 2.1.1-2 armhf hierarchical pool based memory allocator - Python bindings
ii python-tk 2.7.8-2 armhf Tkinter - Writing Tk applications with Python
ii python-urllib3 1.9.1-3 all HTTP library with thread-safe connection pooling for Python
ii python-urllib3-whl 1.9.1-3 all HTTP library with thread-safe connection pooling
ii python-virtualenv 1.11.6+ds-1 all Python virtual environment creator
ii python-wheel 0.24.0-1 all built-package format for Python
ii python2.7 2.7.9-2 armhf Interactive high-level object-oriented language (version 2.7)
ii python2.7-dev 2.7.9-2 armhf Header files and a static library for Python (v2.7)
ii python2.7-minimal 2.7.9-2 armhf Minimal subset of the Python language (version 2.7)
ii python3 3.4.2-2 armhf interactive high-level object-oriented language (default python3 version)
ii python3-apt 0.9.3.12 armhf Python 3 interface to libapt-pkg
ii python3-chardet 2.3.0-1 all universal character encoding detector for Python3
ii python3-colorama 0.3.2-1 all Cross-platform colored terminal text in Python - Python 3.x
ii python3-debian 0.1.27 all Python 3 modules to work with Debian-related data formats
ii python3-dev 3.4.2-2 armhf header files and a static library for Python (default)
ii python3-distlib 0.1.9-1 all low-level components of python distutils2/packaging
ii python3-gpiozero 1.1.0 all Simple API for controlling devices attached to the GPIO pins.
ii python3-html5lib 0.999-3 all HTML parser/tokenizer based on the WHATWG HTML5 specification (Python 3)
ii python3-minimal 3.4.2-2 armhf minimal subset of the Python language (default python3 version)
ii python3-numpy 1:1.8.2-2 armhf Fast array facility to the Python 3 language
ii python3-pgzero 1.1-1 armhf Zero-boilerplate games programming framework based on Pygame (Python 3)
ii python3-picamera 1.10-1 armhf Pure Python interface to the Raspberry Pi’s camera module.
ii python3-pifacecommon 4.2.1-1 all The PiFace common functions module.
ii python3-pifacedigital-scratch-handler 2.0.5-1 all The PiFace Digital Scratch Handler.
ii python3-pifacedigitalio 3.1.0-1 all The PiFace Digital I/O module.
ii python3-pip 1.5.6-5 all alternative Python package installer - Python 3 version of the package
ii python3-pkg-resources 5.5.1-1 all Package Discovery and Resource Access using pkg_resources
ii python3-pygame 1.9.2~pre~r3348-2~bpo8+rpi1 armhf SDL bindings for games development in Python (Python 3)
ii python3-requests 2.4.3-6 all elegant and simple HTTP library for Python3, built for human beings
ii python3-rpi.gpio 0.6.1-1 armhf Python 3 GPIO module for Raspberry Pi
ii python3-serial 2.6-1.1 all pyserial - module encapsulating access for the serial port
ii python3-setuptools 5.5.1-1 all Python3 Distutils Enhancements
ii python3-six 1.8.0-1 all Python 2 and 3 compatibility library (Python 3 interface)
ii python3-spidev 2.0~git20150907 armhf Python bindings for Linux SPI access through spidev (Python 3)
ii python3-tk 3.4.2-1 armhf Tkinter - Writing Tk applications with Python 3.x
ii python3-urllib3 1.9.1-3 all HTTP library with thread-safe connection pooling for Python3
ii python3-virtualenv 1.11.6+ds-1 all Python virtual environment creator
ii python3-wheel 0.24.0-1 all built-package format for Python
ii python3.4 3.4.2-1 armhf Interactive high-level object-oriented language (version 3.4)
ii python3.4-dev 3.4.2-1 armhf Header files and a static library for Python (v3.4)
ii python3.4-minimal 3.4.2-1 armhf Minimal subset of the Python language (version 3.4)
`