python从包含全班同学信息的.csv格式文件中读入数据，根据用户输入的分组要求进行随机分组，显示分组结果并将其写入.csv格式文件中代码

首先需要导入csv和random模块：

import csv
import random

然后读入包含全班同学信息的.csv文件，假设该文件包含两列数据，第一列为学生姓名，第二列为学生学号：

with open('students.csv', 'r') as f:
    reader = csv.reader(f)
    students = [(row[0], row[1]) for row in reader]

接下来，根据用户输入的分组要求，将学生列表随机分组，假设要求将全班分为3组：

group_size = len(students) // 3
random.shuffle(students)
groups = [students[i:i+group_size] for i in range(0, len(students), group_size)]

最后，将分组结果显示出来并将其写入.csv文件中：

with open('groups.csv', 'w', newline='') as f:
    writer = csv.writer(f)
    for i, group in enumerate(groups):
        print('Group {}:'.format(i+1))
        for student in group:
            print(student[0])
            writer.writerow([i+1, student[0], student[1]])

完整代码：

import csv
import random

with open('students.csv', 'r') as f:
    reader = csv.reader(f)
    students = [(row[0], row[1]) for row in reader]

group_size = len(students) // 3
random.shuffle(students)
groups = [students[i:i+group_size] for i in range(0, len(students), group_size)]

with open('groups.csv', 'w', newline='') as f:
    writer = csv.writer(f)
    for i, group in enumerate(groups):
        print('Group {}:'.format(i+1))
        for student in group:
            print(student[0])
            writer.writerow([i+1, student[0], student[1]])