python读取、写入csv文件

import csv,re

#打开wsx.csv文件，为了后面写入做准备
with open("wsx.csv", "w", encoding="utf-8", newline='') as w:   #newline=''，这个参数的作用是防止生成的csv隔一行空一行，如果没有这个参数，csv文件汇总就会隔一行空一行
    writer = csv.writer(w)
　　
　　#读取出来123.csv文件的内容，并把读取出来的内容写入到wsx.csv文件中
    with open("123.csv", "r", encoding="utf-8") as fp:
        t = csv.reader(fp)
        for i in t:
            print(i)  #这里读取出来的i是列表格式
            writer.writerow(i)

# import csv
# a = "text"
# b = "18"
# with open("456.csv","a",encoding="utf-8") as fp:
#     writer = csv.writer(fp)
#
#     writer.writerow([a,b])