Python Pandas

Python Pandas at a Glance

Pandas Author     :   Wes McKinney
About Pandas pandas is a software library written for the Python programming language for data manipulation and analysis.
NumPy Array      : contains values of the same/homogeneous type
Create empty array of size m x n numpy.empty ([m ,n])  
create a 1D array using arrange function of size N arr = np.arrange(N)
Default Data Type of Array float64
Creating Series with NaN Values obj = pd.Series([2 , 5, np.Nan , 4])  
Series                   : one-dimensional array-like object (containing an array of data and an associated array of data labels, called its index)
To fetch first n rows from pandas object P P.head(n)  
To  fetch last n rows from a pandas object P. P.tail(n)
To retrieve dimensions
(shape) of Series Object
P.shape()
To create M x M identity matrix np.eye(M)