python基础-文件的读取与写入

写入

# 写入文本内容
with open('test.txt','w',encoding='utf-8') as file:
    file.write('要写入的字符串')
 
# 新增追加文本内容
with open('test.txt','a') as file:
    file.write('新增写入内容')
 
# 二进制写入
with open('test.jpg','wb') as file:
    file.write('例二进制图片')

读取

# 读取文本内容
with open('test.txt','r') as file:
    file.read()
 
# 二进制读取
with open('test.txt','rb') as file:
    file.read()

CSV的读取与写入

import csv
 
# 写入新的CSV文件
with open('test.csv','w',newline='') as file:    # 中间不换行
    writer=csv.writer(file)    #准备写入文件
    writer.writerow(['内容1','内容2'])   # 列表写入第一行
    writer.writerow(['内容1','内容2'])   # 列表写入第二行
    ....
 
# 新增追加CSV内容
with open('test.csv','a') as file:
    writer=csv.writer(file)    # 准备写入文件
    writer.writerow(['内容1','内容2'])    # 下面增加一行
 
 
# 读取csv文件内容
with open('test.csv','r') as file:
    reader=csv.reader(file)
    for i in reader:
        print(i)