what does append mean in python

1  list = ['larry', 'curly', 'moe']
2  list.append('shemp')         ## append elem at end
3  list.insert(0, 'xxx')        ## insert elem at index 0
4  list.extend(['yyy', 'zzz'])  ## add list of elems at end
5  print list  ## ['xxx', 'larry', 'curly', 'moe', 'shemp', 'yyy', 'zzz']
6  print list.index('curly')    ## 2
7
8  list.remove('curly')         ## search and remove that element
9  list.pop(1)                  ## removes and returns 'larry'
10  print list  ## ['xxx', 'moe', 'shemp', 'yyy', 'zzz']

1EmptyList = []
2list = [1,2,3,4]
3#for appending list elements to emptylist
4for i in list:
5  EmptyList.append('i')

1class Student:
2    def __init__(self, name, age, grade):
3        self.name = name 
4        self.age = age 
5        self.grade = grade 
6
7    def get_grade(self):
8        return self.grade 
9
10class Course:
11    def __init__(self, name, max_student):
12        self.name = name 
13        self.max = max_student
14        self.students = []
15        
16    def add_student(self, student):
17        if len(self.students) < self.max_student: 
18            self.students.append(student)
19            return True
20        return False
21
22    def get_average_grade(self):
23        value = 0
24        for students in self.students:
25            value += Student.get_grade()
26
27        return value / len(self.student)
28
29s1 = Student("Oshadha",20, 100)
30s2 = Student("Tom",20, 55)
31s3 = Student("Ann",20, 99) 
32
33course = Course("Science", 2)
34course.add_student(s1)
35course.add_student(s2)
36print(Course.get_average_grade())

1 list = [1, 2, 3]
2  print list.append(4)   ## NO, does not work, append() returns None
3  ## Correct pattern:
4  list.append(4)
5  print list  ## [1, 2, 3, 4]