Python Data Products
Python Data Products
Course 1: Basics
Lecture: Processing Structured Data in Python
Learning objectives
In this lecture we will... ? Demonstrate how to read JSON/CSV files into python
objects ? Introduce the "gzip" library
Python Data Products Specialization: Course 1: Basic Data Processing...
Reading data into data structures
? In a previous lecture we saw the basics of how to use the CSV/JSON libraries to read structured data
? What comes next? I.e., how to we read the data into appropriate data structures?
Python Data Products Specialization: Course 1: Basic Data Processing...
Reading data into data structures
? In a previous lecture we saw the basics of how to use the CSV/JSON libraries to read structured data
? What comes next? I.e., how to we read the data into appropriate data structures?
1. How do we read larger csv/json files without having to unzip them?
2. How do we extract relevant parts of the data for performing analysis?
3. What structures make access to the data more convenient?
Python Data Products Specialization: Course 1: Basic Data Processing...
Code: The gzip library
"rt" indicates that the file is a text file (default is to
read as bytes)
Otherwise, the file can be treated like a regular file
Even this small file is 12mb zipped and 39mb unzipped
? Often we'll want to manipulate files that are cumbersome to fit on disk if we extract them
? The gzip library allows us to read zipped files (.gz) without unzipping them
Python Data Products Specialization: Course 1: Basic Data Processing...
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