Python的IO流-1

文件读写

很简单的内容，必要的东西写在了注释里：

 1 import os
 2 
 3 print('当前工作目录:'+os.getcwd())  # 这个方法可以得到当前程序的工作目录
 4 try:
 5     f = open('F:/xx1/xx2/Game.txt', 'r')  # 为了安全性,要调用close方法;同时为了保证能够调用close方法，需要放在try,finally里面
 6     print(f.read())
 7 finally:
 8     f.close()
 9 
10 with open('F:/xx1/xx2/Game.txt') as file:  # 这样就不必使用try,finally调用close方法了
11     content = file.read()
12     print(content)
13     file.close()
14 
15 with open('F:/xx1/xx2/Nothing.txt') as file:
16     for line in file:  # 一行一行读取
17         print(line.rstrip())  # 去除后面的'\n'
18     file.close()
19 
20 with open('F:/xx1/xx2/Game.txt', 'w') as file:  # 表示写入，这样会覆盖原内容，如果不想覆盖，用'a'
21     file.write("Oh,that's for sure!")
22     file.close()
23 
24 with open('F:/xx1/xx2/Game.txt', 'r') as file:
25     print(file.read())
26     file.close()
27 
28 with open('F:/魔法世界.jpg', 'rb') as f:  # 读取二进制文件
29     print(f.read())  # 读取内容是用十六进制表示的字节

 

 

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 附：异常处理：

错误处理

def foo(n):
    return 10 / int(n)


def bar(s):
    return foo(s) * 2


def main():
    try:
        bar('0')
    except Exception as e:
        print('Error:', e)
    finally:
        print('Finally...')


main()