Python入门的36个例子 之 33
源代码下载:下载地址在这里
# 037
fileName = ''
while 1:
fileName = raw_input("Input a file name:")
if fileName == 'q':
break
try:
f = file(fileName, 'r')
print 'Opened a file.'
except:
print 'There is no file named', fileName
# end of try and except
f.close()
# end of while
output:
Input a file name:haha
There is no file named haha
Input a file name:txt
There is no file named txt
Input a file name:1
There is no file named 1
Input a file name:037_Exception.py
Opened a file.
Input a file name:q
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StringIO的行为与file对象非常像,但它不是磁盘上文件,而是一个内存里的“文件”,我们可以将操作磁盘文件那样来操作StringIO。一个简单的例子,让你对StringIO有一个感性的认识: 1 #coding=gbk 2 3 import StringIO, cStringIO, sys 4 5 s ......
源代码下载:下载地址在这里
# 024
dict1 = {
'5064001':'Mememe',
'5064002':'tutu',
'5064003':'thrthr',
'5064004':'fofo'
}
print dict1['5064003']
# 也可以使用整型作为唯一的编号
dict2 = {
5064001:'Mememe',
506400 ......
# 027
toolName = 'Google'
if toolName.startswith('Go'):
print 'The tool\'s name starts with \"Go\".'
if 'oo' in toolName:
print 'The tool\'s name contains the stirng "oo".'
print toolName.find('gl') # 返回首次出现“gl”字符串的索引
if toolName.find('Baidu ......
源代码下载:下载地址在这里
# 033
class Person:
age = 22
def sayHello(self): # 方法与函数的区别在于需要一个self参数
print 'Hello!'
# end of def
# end of class # 这是我良好的编程风格
p = Person()
print p.age
p.sayHello()
output:
22
Hello! ......