COMP 499 Introduction to Data Analytics
COMP 499 Introduction to Data Analytics
Lecture 4 -- Python pandas
Greg Butler
Data Science Research Centre and
Centre for Structural and Functional Genomics and
Computer Science and Software Engineering Concordia University, Montreal, Canada gregb@cs.concordia.ca
Overview of Lecture
1. Python array 2. Python numpy ndarray 3. Python pandas DataFrame
Python Types
Python array
Module array in Python 3.3
class array.array(typecode[, initializer])
array
an object type for an array of basic values: characters, integers, floating point numbers
Arrays behave very much like lists except the type of objects is constrained
The type is specified a type code, eg 'l' C signed long (int) 'u' unicode character 'd' C double (float)
Example
array('l') array('l', [1, 2, 3, 4, 5]) array('d', [1.0, 2.0, 3.14])
Python Array Methods
Python numpy Types
Python numpy ndarray
Python numpy ndarray
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