就是remove怎么一次删除无限多个
时间: 2023-08-09 20:12:20 浏览: 41
如果您想一次删除多个指定元素,可以使用循环结构将每个元素都删除。具体操作如下:
```python
list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
remove_list = [2, 4, 6, 8] # 要删除的元素列表
for item in remove_list:
while item in list:
list.remove(item)
print(list)
```
在上述代码中,我们先定义了一个包含多个元素的列表 `list` 和一个要删除的元素列表 `remove_list`。然后使用循环结构和 `remove()` 方法将 `remove_list` 中的所有元素从 `list` 中删除。最后输出结果。
相关问题
用python编写一个固定资产登记系统
好的,下面是一个简单的固定资产登记系统的Python代码示例:
```python
class Asset:
def __init__(self, name, value, category):
self.name = name
self.value = value
self.category = category
class AssetRegister:
def __init__(self):
self.assets = []
def add_asset(self, asset):
self.assets.append(asset)
def remove_asset(self, asset):
self.assets.remove(asset)
def print_register(self):
print("Asset Register:")
for asset in self.assets:
print(f"{asset.category} - {asset.name}: {asset.value}")
register = AssetRegister()
while True:
print("1. Add asset")
print("2. Remove asset")
print("3. Print register")
print("4. Exit")
choice = input("Enter choice: ")
if choice == "1":
name = input("Enter asset name: ")
value = float(input("Enter asset value: "))
category = input("Enter asset category: ")
asset = Asset(name, value, category)
register.add_asset(asset)
print("Asset added successfully.")
elif choice == "2":
name = input("Enter asset name: ")
for asset in register.assets:
if asset.name == name:
register.remove_asset(asset)
print("Asset removed successfully.")
break
else:
print("Asset not found.")
elif choice == "3":
register.print_register()
elif choice == "4":
break
else:
print("Invalid choice. Please try again.")
```
这个系统使用了两个类,一个是 `Asset` 类,用于表示一个固定资产,包括名称、价值和类别三个属性;另一个是 `AssetRegister` 类,用于管理所有的固定资产,包括添加、删除和打印所有资产的功能。
在主程序中,首先创建了一个 `AssetRegister` 对象,然后使用一个无限循环来等待用户输入选择。用户可以选择添加资产、删除资产、打印所有资产或退出程序。根据用户的选择,程序会执行相应的操作。例如,如果用户选择添加资产,程序会要求用户输入资产的名称、价值和类别,并创建一个 `Asset` 对象,然后将其添加到注册系统中。如果用户选择打印所有资产,程序将遍历所有资产并打印它们的信息。
这只是一个简单的示例,实际的固定资产登记系统可能需要更多的功能和复杂性。但是,这个代码示例可以帮助你了解如何使用Python创建一个基本的固定资产登记系统。
生产一个学生选课管理系统代码
好的,以下是一个简单的基于C++的学生选课管理系统代码示例。
```c++
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Course {
private:
string name;
string id;
int capacity;
int enrolled;
public:
Course(string name, string id, int capacity) {
this->name = name;
this->id = id;
this->capacity = capacity;
this->enrolled = 0;
}
string get_name() {
return this->name;
}
string get_id() {
return this->id;
}
int get_capacity() {
return this->capacity;
}
int get_enrolled() {
return this->enrolled;
}
bool add_student() {
if (this->enrolled < this->capacity) {
this->enrolled++;
return true;
} else {
return false;
}
}
};
class Student {
private:
string name;
string id;
vector<Course*> courses;
public:
Student(string name, string id) {
this->name = name;
this->id = id;
}
string get_name() {
return this->name;
}
string get_id() {
return this->id;
}
void enroll(Course* course) {
if (course->add_student()) {
this->courses.push_back(course);
cout << "Enrolled " << course->get_name() << endl;
} else {
cout << "Course is full: " << course->get_name() << endl;
}
}
void drop(Course* course) {
bool found = false;
for (int i = 0; i < this->courses.size(); i++) {
if (this->courses[i]->get_id() == course->get_id()) {
this->courses.erase(this->courses.begin() + i);
course->drop_student();
cout << "Dropped " << course->get_name() << endl;
found = true;
break;
}
}
if (!found) {
cout << "Course not found: " << course->get_name() << endl;
}
}
void list_courses() {
cout << "Courses for " << this->name << ":" << endl;
for (int i = 0; i < this->courses.size(); i++) {
cout << "- " << this->courses[i]->get_name() << endl;
}
}
};
class CourseManager {
private:
vector<Course*> courses;
public:
void add_course() {
string name, id;
int capacity;
cout << "Enter course name: ";
cin >> name;
cout << "Enter course ID: ";
cin >> id;
cout << "Enter course capacity: ";
cin >> capacity;
courses.push_back(new Course(name, id, capacity));
}
void remove_course() {
string id;
cout << "Enter course ID: ";
cin >> id;
bool found = false;
for (int i = 0; i < courses.size(); i++) {
if (courses[i]->get_id() == id) {
courses.erase(courses.begin() + i);
found = true;
cout << "Course removed." << endl;
break;
}
}
if (!found) {
cout << "Course not found." << endl;
}
}
void list_courses() {
cout << "Course list:" << endl;
for (int i = 0; i < courses.size(); i++) {
Course* course = courses[i];
cout << "- " << course->get_name() << " (ID: " << course->get_id() << ") Capacity: " << course->get_capacity() << " Enrolled: " << course->get_enrolled() << endl;
}
}
Course* find_course(string id) {
for (int i = 0; i < courses.size(); i++) {
if (courses[i]->get_id() == id) {
return courses[i];
}
}
return NULL;
}
};
class StudentManager {
private:
vector<Student*> students;
public:
void add_student() {
string name, id;
cout << "Enter student name: ";
cin >> name;
cout << "Enter student ID: ";
cin >> id;
students.push_back(new Student(name, id));
}
void remove_student() {
string id;
cout << "Enter student ID: ";
cin >> id;
bool found = false;
for (int i = 0; i < students.size(); i++) {
if (students[i]->get_id() == id) {
students.erase(students.begin() + i);
found = true;
cout << "Student removed." << endl;
break;
}
}
if (!found) {
cout << "Student not found." << endl;
}
}
void list_students() {
cout << "Student list:" << endl;
for (int i = 0; i < students.size(); i++) {
Student* student = students[i];
cout << "- " << student->get_name() << " (ID: " << student->get_id() << ")" << endl;
student->list_courses();
}
}
Student* find_student(string id) {
for (int i = 0; i < students.size(); i++) {
if (students[i]->get_id() == id) {
return students[i];
}
}
return NULL;
}
};
int main() {
int choice;
CourseManager courseManager;
StudentManager studentManager;
while (true) {
cout << "Select an option:" << endl;
cout << "1. Add course" << endl;
cout << "2. Remove course" << endl;
cout << "3. List courses" << endl;
cout << "4. Add student" << endl;
cout << "5. Remove student" << endl;
cout << "6. List students" << endl;
cout << "7. Enroll student" << endl;
cout << "8. Drop student" << endl;
cout << "0. Exit" << endl;
cin >> choice;
switch (choice) {
case 1:
courseManager.add_course();
break;
case 2:
courseManager.remove_course();
break;
case 3:
courseManager.list_courses();
break;
case 4:
studentManager.add_student();
break;
case 5:
studentManager.remove_student();
break;
case 6:
studentManager.list_students();
break;
case 7: {
string studentId, courseId;
cout << "Enter student ID: ";
cin >> studentId;
Student* student = studentManager.find_student(studentId);
if (student == NULL) {
cout << "Student not found." << endl;
break;
}
cout << "Enter course ID: ";
cin >> courseId;
Course* course = courseManager.find_course(courseId);
if (course == NULL) {
cout << "Course not found." << endl;
break;
}
student->enroll(course);
break;
}
case 8: {
string studentId, courseId;
cout << "Enter student ID: ";
cin >> studentId;
Student* student = studentManager.find_student(studentId);
if (student == NULL) {
cout << "Student not found." << endl;
break;
}
cout << "Enter course ID: ";
cin >> courseId;
Course* course = courseManager.find_course(courseId);
if (course == NULL) {
cout << "Course not found." << endl;
break;
}
student->drop(course);
break;
}
case 0:
return 0;
default:
cout << "Invalid option." << endl;
break;
}
}
return 0;
}
```
该系统包括两个管理类:`CourseManager`和`StudentManager`,以及两个实体类:`Course`和`Student`。每个类都有一些方法,以实现相应的功能。
在主函数中,我们创建了`CourseManager`和`StudentManager`对象,并使用一个无限循环来等待用户输入选项。用户可以选择添加、删除、列出课程或学生,或者将学生注册到课程中,或将学生退课。系统会根据用户的选择调用相应的方法。
这只是一个简单的示例,实际的学生选课管理系统需要更多的功能和错误处理。但是,这应该可以帮助你开始编写自己的程序。