我有一個直到 3 個專案的串列，每個專案都有一個直到 5 個專案的串列。我需要替換另一個串列中的 2 個專案。我只得到要改變的字串。不回傳任何東西，例如：我有一個班級學校，有一個班級串列[ size<=3]。并且每個班級都有一個學生串列[size<=5] 我得到兩個學生的“姓名”，我需要通過在所有班級和所有學生上運行并交換它們來在學校中搜索它們。Student 類有一個“名稱”欄位。特別是如果他們不在同一個教室里
class Student:
def __init__(self, id, name):
self.name = name
self.id = id
class ClassRoom:
def __init__(self):
self.Students[]
class School:
def __init__(self):
self.classes = []
def swap(self, name1, name2):
#???
scl.classes = [c1,c3]
s2 = Student(2,"John")
s6 = Student(6, "Ben")
c1.students = [s1,s2,s3]
c3.students = [s1,s4,s6]
scl.search_replace("John", "Ben")
謝謝
uj5u.com熱心網友回復：
你需要三個班級——學校、班級和學生。一所學校有多個班級。一個班級有多個學生。
為了能夠輕松查看發生了什么，最好為每個類實作 __str__。
像這樣的東西：
class School:
def __init__(self, name):
self._name = name # name of the school
self._classes = [] # list of classes in the school
@property
def classes(self):
return self._classes
@property
def name(self):
return self._name
def add(self, clazz):
assert isinstance(clazz, Class)
self.classes.append(clazz)
def search(self, name):
for c, clazz in enumerate(self.classes):
if name in clazz.students:
return c, clazz.students.index(name)
return -1, -1
def replace(self, st1, st2):
c1, s1 = self.search(st1)
c2, s2 = self.search(st2)
if s1 >= 0 and s2 >= 0:
self.classes[c1].students[s1], self.classes[c2].students[s2] = self.classes[c2].students[s2], self.classes[c1].students[s1]
def __str__(self):
return f'{self.name}:\n' '\n'.join(map(str, self.classes))
class Class:
def __init__(self, name):
self._name = name # name of the class
self._students = [] # list of students in the class
@property
def students(self):
return self._students
@property
def name(self):
return self._name
def add(self, student):
assert isinstance(student, Student)
self.students.append(student)
def __str__(self):
return f'{self.name}: ' ', '.join(map(str, self.students))
class Student:
def __init__(self, name, ident):
self._name = name # student's name
self._ident = ident # student ID
@property
def name(self):
return self._name
@name.setter
def name(self, name):
self._name = name
@property
def ident(self):
return self._ident
def __str__(self):
return f'{self.name} ({self.ident})'
def __eq__(self, other):
if isinstance(other, str):
return other == self.name
if isinstance(other, Student):
return other.name == self.name
return False
school = School('Tel Aviv High School')
clazz = Class('Psychology')
school.add(clazz) # add the Psychology class to the school
student1 = Student('John', 1)
student2 = Student('Ben', 2)
clazz.add(student1) # add student to the class
clazz.add(student2)
clazz = Class('Chemistry') # add Chemistry class to the school
school.add(clazz)
clazz.add(Student('Haim', 3)) # add student to the class
print(school) # print the school, all of it classes and students within those classes
school.replace('Haim', 'John')
print(school) # print the school again and note that Haim and John have changed places
輸出：
Tel Aviv High School:
Psychology: John (1), Ben (2)
Chemistry: Haim (3)
Tel Aviv High School:
Psychology: Haim (3), Ben (2)
Chemistry: John (1)
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