如何根據類資料從串列中洗掉專案

class Student:

    def __init__(self, name, major, gpa, onProbation):
        self.name = name
        self.major = major
        self.gpa = gpa
        self.onProbation = onProbation

        Student1 = Student("Josh", "Business", 3.8, False)
        Student2 = Student("Maya", "Accountancy", 2.5, True)
        Student3 = Student("Dan", "Psychology", 1.2, True)
        Student4 = Student("Keon", "Biomedical Engineering", 4.0, False)
        Student5 = Student("Michelle", "Medicine", 3.7, False)
        Student6 = Student("Joey", "Law", 4.0, False)

Students = ["Josh", "Maya", "Dan", "Keon", "Michelle", "Joey"]

我想弄清楚如何從串列中洗掉所有處于試用期的學生，所以如果我輸入 print(Students)，它只會給我未處于試用期的學生（Josh、Keon、Michelle 和 Joey )

uj5u.com熱心網友回復：

我相信我已經找到了你問題的答案。我還想指出，最好不要在init方法中創建學生物件，將所有學生存盤在串列中很有用。它是：

class Student:

    def __init__(self, name, major, gpa, onProbation):
        self.name = name
        self.major = major
        self.gpa = gpa
        self.onProbation = onProbation

students = [
    Student("Josh", "Business", 3.8, False),
    Student("Maya", "Accountancy", 2.5, True),
    Student("Dan", "Psychology", 1.2, True),
    Student("Keon", "Biomedical Engineering", 4.0, False),
    Student("Michelle", "Medicine", 3.7, False),
    Student("Joey", "Law", 4.0, False)
]

# I created a list for new students because it will mess up the for loop if you remove objects from a list while iterating
new_students = []
for student in students:
    if student.onProbation == False:
        new_students.append(student)

# print(students) will return an unreadable list with encoded numbers and such so I did this instead
for student in new_students:
    print(student.name,  student.onProbation)

我希望這是有用的。

uj5u.com熱心網友回復：

class Student:

    def __init__(self, name, major, gpa, onProbation):
        self.name = name
        self.major = major
        self.gpa = gpa
        self.onProbation = onProbation

    @staticmethod
    def getStudentsNotOnProbation(students):
      res = []
      for student in students:
       if not student.onProbation:
         res.append(student)
      return res

Student1 = Student("Josh", "Business", 3.8, False)
Student2 = Student("Maya", "Accountancy", 2.5, True)
Student3 = Student("Dan", "Psychology", 1.2, True)
Student4 = Student("Keon", "Biomedical Engineering", 4.0, False)
Student5 = Student("Michelle", "Medicine", 3.7, False)
Student6 = Student("Joey", "Law", 4.0, False)

Students = [Student1, Student2, Student3, Student4, Student5, Student6]


print(Student.getStudentsNotOnProbation(Students))

我使用 staticmethod 的原因是邏輯應該封裝在 Student 類本身中。

uj5u.com熱心網友回復：

我就是這樣做的。當你創建類時，它甚至會記住串列中的屬性分配。cpython中有個叫pylist的

class Student:

    def __init__(self, name: str, major: str, gpa:float, onProbation: bool):
        self.name = name
        self.major = major
        self.gpa = gpa
        self.onProbation = onProbation

# in your example you placed the class instances in the class, 
#   notice how mine are placed outside. The __init__ method initializes
#   the object, having it within the object is infinitly recursive i believe

student1 = Student("Josh", "Business", 3.8, False)
student2 = Student("Maya", "Accountancy", 2.5, True)
student3 = Student("Dan", "Psychology", 1.2, True)
student4 = Student("Keon", "Biomedical Engineering", 4.0, False)
student5 = Student("Michelle", "Medicine", 3.7, False)
student6 = Student("Joey", "Law", 4.0, False)

students = [student1,student2,student3,student4,student5, student6]

mylist = students
for index, student in enumerate(students):
    if student.onProbation: # if the boolean isnt specified, defaults to true as is
        mylist.remove(students[index])

正如約翰戈登指出的那樣，你可以使用串列理解

class Student:

    def __init__(self, name: str, major: str, gpa:float, onProbation: bool):
        self.name = name
        self.major = major
        self.gpa = gpa
        self.onProbation = onProbation



student1 = Student("Josh", "Business", 3.8, False)
student2 = Student("Maya", "Accountancy", 2.5, True)
student3 = Student("Dan", "Psychology", 1.2, True)
student4 = Student("Keon", "Biomedical Engineering", 4.0, False)
student5 = Student("Michelle", "Medicine", 3.7, False)
student6 = Student("Joey", "Law", 4.0, False)

students = [student1,student2,student3,student4,student5, student6]

good_students = [x for x in students if not student.onProbation]

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