python基础复习（17）--文件指针

#文件指针
#tell获取当前文件指针
fobj=open("./abcde.txt","wt")
print(fobj.tell())
fobj.write("abc")
print(fobj.tell())
fobj.close()

# rt+  wt+  at+允许移动文件指针  seek(offset,whence)   offset偏移量  whence  默认0从文件开始算起  1从当前位置算起  2从文件末尾算起
def writeFile():
    fobj=open("./cc.txt","wt+")
    print(fobj.tell())
    fobj.write("123")
    print(fobj.tell())
    fobj.seek(1,0)
    print(fobj.tell())
    fobj.write("abc")
    print(fobj.tell())
    fobj.close()

def readFile():
    fobj=open("./cc.txt","rt+")
    rows=fobj.read()
    print(rows)
    fobj.close()

try:
    writeFile()
    readFile()
except BaseException as err:
    print(err)