with语句一般用于文件打开,避免使用如下繁琐的格式:
fd = None try: fd = open("./hello.txt") for line in fd: print line except Exception as e: print e finally: fd.close()
使用with语句如下:
with open("./hello.txt") as f: for line in f: print line
其他更cool的用法,留到以后慢慢收集。
with语句一般用于文件打开,避免使用如下繁琐的格式:
fd = None try: fd = open("./hello.txt") for line in fd: print line except Exception as e: print e finally: fd.close()
使用with语句如下:
with open("./hello.txt") as f: for line in f: print line
其他更cool的用法,留到以后慢慢收集。