import pandas as pd
import random
from itertools import product

names = ['Alice', 'Bob', 'Chunk', 'David', 'Eva', 'Frank']
course = ['A', 'B', 'C']
age = [random.randint(18, 20) for _ in range(len(names))]


stu = pd.DataFrame({
    'name':names,
    'sex':[random.randint(0, 1) for _ in range(len(names))],
    'age':age,
})

stu.to_csv('data.csv')

p = product(names, course)
names.clear()
course.clear()
for x, y in p:
    names.append(x)
    course.append(y)

score = pd.DataFrame({
    'name':names,
    'course':course,
    'score':[random.randint(0, 100) for _ in range(len(names))]
})

score.to_csv('score.csv')