python静态方法实例

yipeiwu_com6年前Python基础

本文实例讲述了python静态方法。分享给大家供大家参考。

具体实现方法如下:

复制代码 代码如下:
staticmethod Found at: __builtin__
staticmethod(function) -> method
    
    Convert a function to be a static method.
    
    A static method does not receive an implicit first argument.
    To declare a static method, use this idiom:
    
    class C:
    def f(arg1, arg2, ...): ...
    f = staticmethod(f)
    
    It can be called either on the class (e.g. C.f()) or on an
     instance
    (e.g. C().f()).  The instance is ignored except for its class.
    
    Static methods in Python are similar to those found in
     Java or C++.
    For a more advanced concept, see the classmethod builtin.
  
class Employee:
   """Employee class with static method isCrowded"""
 
   numberOfEmployees = 0  # number of Employees created
   maxEmployees = 10  # maximum number of comfortable employees
 
   def isCrowded():
      """Static method returns true if the employees are crowded"""
 
      return Employee.numberOfEmployees > Employee.maxEmployees
 
   # create static method
   isCrowded = staticmethod(isCrowded)
 
   def __init__(self, firstName, lastName):
      """Employee constructor, takes first name and last name"""
 
      self.first = firstName
      self.last = lastName
      Employee.numberOfEmployees += 1
 
   def __del__(self):
      """Employee destructor"""
 
      Employee.numberOfEmployees -= 1    
 
   def __str__(self):
      """String representation of Employee"""
 
      return "%s %s" % (self.first, self.last)
 
# main program
def main():
   answers = [ "No", "Yes" ]  # responses to isCrowded
   
   employeeList = []  # list of objects of class Employee
 
   # call static method using class
   print "Employees are crowded?",
   print answers[ Employee.isCrowded() ]
 
   print "\nCreating 11 objects of class Employee..."
 
   # create 11 objects of class Employee
   for i in range(11):
      employeeList.append(Employee("John", "Doe" + str(i)))
 
      # call static method using object
      print "Employees are crowded?",
      print answers[ employeeList[ i ].isCrowded() ]
 
   print "\nRemoving one employee..."
   del employeeList[ 0 ]
 
   print "Employees are crowded?", answers[ Employee.isCrowded() ]
 
if __name__ == "__main__":
   main()

希望本文所述对大家的Python程序设计有所帮助。

相关文章

Redis使用watch完成秒杀抢购功能的代码

redis使用watch完成秒杀抢购功能: 使用redis中两个key完成秒杀抢购功能,mywatchkey用于存储抢购数量和mywatchlist用户存储抢购列表。 它的优点如下: 1...

python format 格式化输出方法

0、前言 在python2.7及以上的版本,str.format()的方式为格式化提供了非常大的便利。与之前的%型格式化字符串相比,他显得更为方便与优越。下面我们就来看看format的具...

pandas dataframe的合并实现(append, merge, concat)

创建2个DataFrame: >>> df1 = pd.DataFrame(np.ones((4, 4))*1, columns=list('DCBA'), ind...

Python装饰器限制函数运行时间超时则退出执行

实际项目中会涉及到需要对有些函数的响应时间做一些限制,如果超时就退出函数的执行,停止等待。 可以利用python中的装饰器实现对函数执行时间的控制。 python装饰器简单来说可以在不改...

Python read函数按字节(字符)读取文件的实现

文件对象提供了 read() 方法来按字节或字符读取文件内容,到底是读取宇节还是字符,则取决于是否使用了 b 模式,如果使用了 b 模式,则每次读取一个字节;如果没有使用 b 模式,则每...