第一種：
首先定義類，然后在同一個(gè)文件中調(diào)用這個(gè)類，代碼如下：
classtest.py文件中代碼如下：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
class Employee: ? ?#定義類
emCount = 0
def __init__(self,name,salary):
self.name = name
self.salary = salary
Employee.emCount +=1
def displayCount(self):
print "Total Employee %d" % Emplpoyee.emCount
def displayEmploee(self):
print "Name : ",self.name,",salary : ",self.salary
emp1 = Employee("ZARA",2000) ? ? #無主函數(shù)，直接創(chuàng)建對象
emp2 = Employee("MANNY",5000)
emp1.displayEmploee()
emp2.displayEmploee()
print "Total Employee %d " % Employee.emCount
第二種：
首先定義類，然后在同一個(gè)文件中通過主函數(shù)調(diào)用這個(gè)類，代碼如下：
classtest2.py文件中代碼如下：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
class Employee:
emCount = 0
def __init__(self,name,salary):
self.name = name
self.salary = salary
Employee.emCount +=1
def displayCount(self):
print "Total Employee %d" % Emplpoyee.emCount
def displayEmploee(self):
print "Name : ",self.name,",salary : ",self.salary
if __name__ == '__main__':? ? #主函數(shù)，下劃線為兩道
emp1 = Employee("ZARA",2000)
emp2 = Employee("MANNY",5000)
emp1.displayEmploee()
emp2.displayEmploee()
print "Total Employee %d " % Employee.emCount
第三種：
首先定義類，然后將定義部分在一個(gè)文件中
主函數(shù)調(diào)用這個(gè)類放在另一個(gè)文件中，這樣的好處是，代碼易讀且后期更易修改維護(hù)，格式更規(guī)范，盡量使用這種方式，代碼如下：
classtest3.py文件定義類中代碼如下：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
class Employee:
emCount = 0
def __init__(self,name,salary):
self.name = name
self.salary = salary
Employee.emCount +=1
def displayCount(self):
print "Total Employee %d" % Emplpoyee.emCount
def displayEmploee(self):
print "Name : ",self.name,",salary : ",self.salary
main.py文件為主程序，創(chuàng)建對象，調(diào)用函數(shù)代碼如下：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
from classtest3 import Employee #這句很重要，一定要加上這句，才能訪問到這個(gè)類，創(chuàng)建對象?
if __name__ == '__main__': ? ? #主函數(shù)
emp1 = Employee("ZARA",2000)
emp2 = Employee("MANNY",5000)
emp1.displayEmploee()
emp2.displayEmploee()
print "Total Employee %d " % Employee.emCount
