[Python] How to extract City From Purchase Address Column using Python

I want to create a new column in df called a city

This is how the column looks like in df data frame:

**Purchase Address**
917 1st St, Dallas, TX 75001
682 Chestnut St, Boston, MA 0221


My Expected output should be a new column in df called a city where values between the comma (,) should be in place for example......

**City**
Dallas
Boston

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