python 练习

继承

#-*- coding:UTF-8-*-
class SchoolMember:
	def __init__(self, name, age):
		self.name = name
		self.age = age
		print '初始化%s' % self.name
	#end of def
	def tell(self):
		print '名字: %s 年龄: %s' % (self.name, self.age)
	#end of def
#end of class

class Teacher(SchoolMember):
	def __init__(self, name, age, salary):
		SchoolMember.__init__(self, name, age)
		self.salary = salary
		print '初始化教师: %s' % self.name
	#end of def
	def tell(self):
		SchoolMember.tell(self)
		print '薪水: %s' % self.salary
	#end of def
#end of class

class Student(SchoolMember):
	def __init__(self, name, age, marks):
		SchoolMember.__init__(self, name, age)
		self.marks = marks
		print '初始化学生: %s' % self.name
	#end of def
	def tell(self):
		SchoolMember.tell(self)
		print '分数: %s' % self.marks
	#end of def
#end of class

t1 = Teacher('张华', '60', '30000')
s1 = Student('李磊', '21', '99')
print
members = [t1, s1]
for ele in members:
	ele.tell()
#end of for

异常

#-*- coding:UTF-8-*-
fileName = ''
while 1:
	fileName = raw_input('Input a file name :')
	if fileName == 'q':
		break
	#end of if
	try:
		f = file(fileName, 'r')
		print 'Opened a file'
		f.close()
	except:
		print 'There is no file named ', fileName
	#end of try and except
#end of while	

#-*- coding:UTF-8-*-
#raise有两个参数，第一个是由我们自己定义的异常类型，第二个是关于此异常的少量说明信息
def getAge():
	age = input('Input your age: ')
	if(age < 0 or age > 160):
		raise 'BadAgeError', 'It is impossable!!!!'
	#end of if
	return age
#end of def
print getAge()

#-*- coding:UTF-8-*-
while True:
	try:
		x = int(raw_input('Input a number: '))
		y = int(raw_input('Input a number: '))
		z = x / y
	except ValueError, ev:
		print 'That is not a valid number.', ev
	except ZeroDivisionError, ez:
		print 'Divisor is zero. ', ez
	except:
		print 'Unexpected error.'
	else:
		print 'There is no error.'
		break
	# end of try
#end of while
print x, '/', y, '=', x/y

#-*- coding:UTF-8-*-
import time
f = file('G:\\PyWk\\finally.py') #这个很受不了，很多书和资料照搬国外 有错误都不改变
try:
	#f = file('G:\\PyWk\\finally.py') 原来在这个位置
	while True:
		line = f.readline()
		if len(line) == 0:
			break
		time.sleep(0.33)
		print line,
	#end of while
finally:
	f.close()
	print 'Closed the file.'
#end of try