day05 异常处理 unix2dos

try:
    n = int(input("number: "))
    result = 100 / n
except (ValueError, ZeroDivisionError):
    print('invalid number')
except (KeyboardInterrupt, EOFError):
    print('\nBye-bye')
else:
    print(result)  # 异常不发生时才执行else子句
finally:
    print('Done')  # 不管异常是否发生都必须执行的语句

# 常用形式有try-except和try-finally######

###################################

import sys

def unix2dos(fname):
    dst_fname = fname + '.txt'

    with open(fname) as src_fobj:
        with open(dst_fname, 'w') as dst_fobj:
            for line in src_fobj:
                line = line.rstrip() + '\r\n'
                dst_fobj.write(line)

if __name__ == '__main__':
    unix2dos(sys.argv[1])