python-文件操作

python的课后作业

题一：

f =  open("python.txt","a")
f.write("python")

题二：

import os

f =  open("python.txt","a")
f.write("python")
f.close()
os.rename("python.txt","python_NEW.txt")

题三：

f =  open("python.txt","a")
f.write("python")
with open("python.txt") as f:
    file = f.readline()
    print(file)
    file1 = file.swapcase()
    print(file1)

或者

f =  open("python.txt","a+")
f.write("python")
f.seek(0)  #将指针归0，也就是复原到第一位，读取是从指针往后读，指针在最后，他后面就没有东西了
file = f.readline()
print(file)
file1 = file.swapcase()
print(file1)
f.close()