How to preserve line breaks when generating python docs using sphinx

I am using Sphinx for generating docs for a python project. The output html is not preserving the line breaks which are present in the docstring. Example:

Code

def testMethod(arg1,arg2):
    """
    This is a test method

    Arguments:
    arg1: arg1 description
    arg2: arg2 description

    Returns:
    None
    """
    print "I am a test method"

Sphinx O/P:

TestModule.testMethod(arg1, arg2)

This is a test method

Arguments: arg1: arg1 description arg2: arg2 description

Returns: None

Any idea how to fix it ?