man python. You can also install python-docs, which provides HTML manuals and references in the following location:
file:///usr/share/doc/python-docs-version/html/index.html
pydoc component_name. For example, pydoc math will display the following information about the math Python module:
Help on module math: NAME math FILE /usr/lib64/python2.6/lib-dynload/mathmodule.so DESCRIPTION This module is always available. It provides access to the mathematical functions defined by the C standard. FUNCTIONS acos[...] acos(x) Return the arc cosine (measured in radians) of x. acosh[...] acosh(x) Return the hyperbolic arc cosine (measured in radians) of x. asin(...) asin(x) Return the arc sine (measured in radians) of x. asinh[...] asinh(x) Return the hyperbolic arc sine (measured in radians) of x.