We learn how to parse strings pull sub-strings out of a string using the split() function.

Strings, Files, Lists and the Guardian Pattern.

We compare and contrast how Python lists and dictionaries are structured internally. How we use position to index lists and use keys to index dictionaries.

We look at how we can use dictionaries to count the frequencies of many things at the same time. We learn how the key and value are related in a dictionary and example the get method to retrieve values from a Python dictionary.

In this segment we bring everything together, reading a file, parsing the lines, and computing the frequencies of the words in the file. This is an important moment that pulls from everything we have learned so far.

Worked Exercise: Dictionaries

We look at the basic syntax and capabilities of Python tuples. We explore the concept of immutability, and we compare tuples to lists and strings.

We look at how we sort lists, dictionaries, and lists of tuples in Python.

Worked Example: Sorting Dictionaries

We look at the syntax of regular expressions and how to use them to search through text data.