class Student:

def $\_\_$init$\_\_($self$,$ name, student$\_$id$)$:

# Initialize attributes

self.$\_\_$name $=$ self.$\_\_$validate$\_$name$($name$)$

self.$\_\_$id $=$ self.$\_\_$validate$\_$id$($student$\_$id$)$

self.$\_\_$courses$\_$enrolled $=$ set$()$

self.$\_\_$courses$\_$taken $=\{\}$

# Property for name attribute

@property

def name$($self$)$:

return self.$\_\_$name

# Setter for name attribute

@name.setter

def name$($self$,$ new$\_$name$)$:

self.$\_\_$name $=$ self.$\_\_$validate$\_$name$($new$\_$name$)$

# Property for id attribute

@property

def id$($self$)$:

return self.$\_\_$id

# Setter for id attribute

@id$.$setter

def id$($self$,$ new$\_$id$)$:

self.$\_\_$id $=$ self.$\_\_$validate$\_$id$($new$\_$id$)$

# Method to get a copy of enrolled courses

def get$\_$courses$\_$enrolled$($self$)$:

return self.$\_\_$courses$\_$enrolled.copy$()$

# Method to enroll in a course

def enroll$\_$in$\_$course$($self$,$ course$)$:

if not isinstance$($course$,$ Course$)$:

raise TypeError$("$Course must be an instance of Course."$)$

self.$\_\_$courses$\_$enrolled.add$($course$)$

# Method to record grade for a course

def record$\_$grade$($self$,$ course, grade$)$:

if not isinstance$($course$,$ Course$)$:

raise TypeError$("$Course must be an instance of Course."$)$

if grade not in $(\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},\text{'}$F$\text{'})$:

raise ValueError$("$Grade must be one of $\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},\text{'}$F$\text{'}.")$

self.$\_\_$courses$\_$taken$[$course$]=$ grade

# Method to calculate GPA

def get$\_$gpa$($self$)$:

total$\_$credits $=0$

total$\_$points $=0$

for course, grade in self.$\_\_$courses$\_$taken.items$()$:

total$\_$credits $+=$ course.credits

total$\_$points $+=\{\text{'}$A$\text{'}$: $4\mathrm{.}0,\text{'}$B$\text{'}$: $3\mathrm{.}0,\text{'}$C$\text{'}$: $2\mathrm{.}0,\text{'}$D$\text{'}$: $1\mathrm{.}0,\text{'}$F$\text{'}$: $0\mathrm{.}0\}[$grade$]*$ course.credits

if total$\_$credits $==0$:

return $0$

return total$\_$points $/$ total$\_$credits

# Private method to validate name

def $\_\_$validate$\_$name$($self$,$ name$)$:

if not isinstance$($name$,$ str$)$ or len$($name$.$strip$())==0$:

raise ValueError$("$Invalid name."$)$

return name.strip$()$

# Private method to validate ID

def $\_\_$validate$\_$id$($self$,$ student$\_$id$)$:

if not isinstance$($student$\_$id$,$ int$)$:

raise TypeError$("$Student ID must be an integer."$)$

if not $(1<=$ student$\_$id $<=9999999)$:

raise ValueError$("$Student ID must be in the range $[1-9999999].")$

return student$\_$id