文件和异常

 

1.常量列表元组，(item1,itme2,item3),赋值后就不能改变
 
2.try:
       code
   except:
        pass
 
3.
import os
os.chdir("F:\\book\\python\\headfirst python book&&code\\code\\chapter3")

try:
     data=open("ssketch.txt")
     for each_line in data:
             try:
                     (role,line_spoken)=each_line.split(":",1)
                     print(role,end="")
                     print(" said: ",end="")
                     print(line_spoken)
             except ValueError:
                     pass
     data.close()
except IOError:
     print("file is missing")
 
 
4.BIF :
        data.split()   //拆分字符串
        data.readline() //读出一行
        data.seek(0)   //设置位置
        data.close()   //关闭流