python-06

#!/usr/bin/env python
#coding:utf8
import os
for tmpdir in ('/tmp', r'c:\temp'):
    if os.path.isdir(tmpdir):
        break
else:
    print '没有这个目录'
    tmpdir = ''
if tmpdir:
    os.chdir(tmpdir)
    cwd = os.getcwd()
    print '当前临时目录'
    print cwd
    print '创建目录'
    os.mkdir('example')
    os.chdir('example')
    cwd = os.getcwd()
    print '新目录'
    print cwd
    print '列出目录'
    print os.listdir(cwd)
    fobj = open('test', 'w')
    fobj.write('test1\n')
    fobj.write('test2\n')
    fobj.close()
    print '更新目录列表'
    print os.listdir(cwd)
    print '重新改名'
    os.rename('test', 'filetest.txt')
    print '重新列出目录'
    print os.listdir(cwd)
    path = os.path.join(cwd, os.listdir(cwd)[0])
    print '完整路径'
    print path
    print 'pathname, basename'
    print os.path.split(path)
    print '文件名, 扩展名'
    os.path.splitext(os.path.basename(path))
    print '显示文件内容'
    fobj = open(path)
    for eachline in fobj:
        print eachline,
    fobj.close()
    print '删除test文件'
    os.remove(path)
    print '更新目录'
    print os.listdir(cwd)
    os.chdir(os.pardir)
    print '删除test目录'
    os.rmdir('example')
    print 'END!'

 异常

处理方法一：

#!/usr/bin/env python
import time
for i in range(10):
    print i
    try:
        time.sleep(1)
    except KeyboardInterrupt:
        break

处理方法二：

#!/usr/bin/env python
try:
    s = 100 / int(raw_input('enter a number: '))
except (ValueError, ZeroDivisionError):
    print 'Invalid input'
else:
    print s

处理方法三：

#!/usr/bin/env python
try:
    s = 100 / int(raw_input('enter a number: '))
except ValueError:
    print 'Invalid input: Please input a number.'
except ZeroDivisionError:
    print 'input a non-zero number.'
else:
    print s

处理方法四：

#!/usr/bin/env python
try:
    s = 100 / int(raw_input('enter a number: '))
except ValueError:
    print 'Invalid input: Please input a number.'
except ZeroDivisionError, e:
    print 'Error: ', e
else:
    print s

处理方法五；     不推荐这种方法

#!/usr/bin/env python
try:
    s = 100 / int(raw_input('enter a number: '))
except:
    print 'Error'

处理方法六：

#!/usr/bin/env python
try:
    s = 100 / int(raw_input('enter a number: '))
except (ValueError, ZeroDivisionError), e:
    print 'Error:', e
else:
    print s
finally:
    print 'Done.'

处理方法七：

#!/usr/bin/env python
i = 0
while True:
    print i
    i += 1
    if i > 10:
        try:
            raise ValueError
        except ValueError:
            print 'Error'
            break

处理方法八：

#!/usr/bin/env python
i = 0
while True:
    print i
    i += 1
    try:
        assert i < 5
    except AssertionError:
        break

来自为知笔记(Wiz)