Write the Python code to store ALL of the courses with the course number of exactly $200($ex: CS $200,$ STAT $200,$ etc...$)$ into the Python variable df$\_$courses.

This problem uses the UIUC Course Catalog dataset. It contains information about all of the sections of courses offered at UIUC. This dataset has already been loaded into a variable df for you and contains the following variables $($columns$)$:

Year $($number$)$: The year the course section was offered.

Term $($string$)$: The term the course section was offered $($Fall$,$ Spring, Summer, or Winter$)$

YearTerm $($string$)$: A formatted combination of the year and term

Subject $($string$)$: A $2-4$ letter subject code for the course; ex: HIST for History, CS for Computer Science, etc.

Number $($number$)$: A $1-3$ digit course number

Description $($string$)$: A short catalog description for the course

Credit Hours $($string$)$: Course credit hours, formatted as a string

Section Info $($string $|$ empty$)$: Course section specific information

Degree Attributes $($string $|$ empty$)$: Fulfillment of general education credit requirements