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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源代码下载：下载地址在这里
# 025
# 序列的神奇之处在于你可以使用相同的方式tuple、list和string
se = ['a', 'b', 'c', 'd']
li = ['a', 'b', 'c', 'd']
tu = ('a', 'b', 'c', 'd')
string = 'abcd'
print se[1]
print li[1]
print tu[1]
print string[1]
# 序列的另外一个神奇之处在于，你可以使用负数进行索 ......
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! ......
源代码下载：下载地址在这里
# 034
class Person:
def __init__(self, name):
self.name = name # 这一句中第一个name是类中包含的域，第二个name是传进来的参数
# end of def
def sayHello(self):
print 'Hello!'
# end of def
# end of class
p = Person('Ning')
print p.nam ......
源代码下载：下载地址在这里
A Byte Of Python
中关于继承有这样的文字：
Suppose you want to write a program which has to keep track of the
teachers and students in a college. They have some common
characteristics such as name, age and address. They also have specific
characteristics such as sala ......
