详解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()