I am trying to get documentation of some objects by pressing cmd+I in spyder but it gives a one line definition of the object instead of a detailed one. I am using python 3.5 and spyder 3.1.4. For e.g. documentation for OLS object looks like

where it should have been like

Edit: It doesn't happen with all of the class objects but intermittently with some not sure which ones. I currently have the following dependencies:
jedi >=0.9.0 : 0.9.0 (OK)
matplotlib >=1.0 : 2.0.0 (OK)
nbconvert >=4.0 : 4.2.0 (OK)
numpy >=1.7 : 1.11.3 (OK)
pandas >=0.13.1 : 0.19.2 (OK)
pep8 >=0.6 : 1.7.0 (OK)
psutil >=0.3 : 5.0.1 (OK)
pyflakes >=0.6.0 : 1.5.0 (OK)
pygments >=2.0 : 2.1.3 (OK)
pylint >=0.25 : 1.6.4 (OK)
qtconsole >=4.2.0: 4.3.0 (OK)
rope >=0.9.4 : 0.9.4-1 (OK)
sphinx >=0.6.6 : 1.5.1 (OK)
sympy >=0.7.3 : 1.0 (OK)