【python】读取和输出到txt

with open("test.txt", "r") as f:    #打开文件
    data = f.read()   #读取文件
    print(data)

with open("test.txt", "r") as f:
    data = f.readline()
    print(data)

with open("test.txt", "r") as f:
    data = f.readlines()
    print(data)

with open("test.txt", "r") as f:
    for line in f.readlines():
        line = line.strip('\n')  #去掉列表中每一个元素的换行符
        print(line)

with open("test.txt","w") as f:
        f.write("这是个测试！")  #这句话自带文件关闭功能，不需要再写f.close()

  data=open("D:\data.txt",'w+') 
  print('这是个测试',file=data)
  data.close()