20.python——数据读取与存储

一、一维数据

1.一维数据在python中的表示形式

2.一维数据在文件中的存储方式

3.一维数据的处理

ls = ["北京","上海","深圳","广州"]
f = open("city.csv","w")
s = ",".join(ls)
f.write(s)
f.close()

f = open("city.csv","r")#另外建一个文件
info = f.read()
f.close()
ls = info.split(",")
print(ls)

二、二维数据

·二维数据在python中的表示形式

·二维数据在文件中的存储方式

·二维数据的处理

students = [
    ["学号","姓名","性别","年龄"],
    ["1002","李四","男","16"],
    ["1003","王五","女","19"],
    ]

f = open("students.csv","w")
for row in students:
    s = ",".join(row) + "\n"
    f.write(s)
f.close()

f = open("students.csv","r")#另外创建一个文件写
students = []
for line in f:
    line = line.strip("\n")#去除换行符
    temp = line.split(",")
    students.append(temp)
f.close()
print(students)