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Python3.6简单反射操作示例

yipeiwu_com5年前 (2020-03-06)Python基础

本文实例讲述了Python3.6简单反射操作。分享给大家供大家参考，具体如下：

# -*- coding:utf-8 -*-
#!python3
# -----------------------
# __Author : tyran
# __Date : 17-11-13
# -----------------------
class Base:
  def __init__(self):
    self.name = 'aaa'
    self.age = 18
  def show(self):
    print(self.age)
# 通过getattr（）找到对象的成员
base = Base()
v = getattr(base, 'name')
print(v) # aaa
func1 = getattr(base, 'show')
func1() # 18
# 通过hasattr（）查找成员是否存在
print(hasattr(base, 'name')) # True
print(hasattr(base, 'name1')) # False
# 通过setattr（）给对象添加成员
setattr(base, 'k1', 'v1')
print(base.k1)
delattr(base, 'k1') # v1
# print(base.k1) 报错AttributeError: 'Base' object has no attribute 'k1'
# -------------------------------------------------------------------------
# Class也是一个对象
class ClassBase:
  sex = 'male'
  def __init__(self):
    self.name = 'aaa'
    self.age = 11
  @staticmethod
  def show():
    print('I am static')
  @classmethod
  def c_method(cls):
    print(cls.sex)
sex_value = getattr(ClassBase, 'sex')
print(sex_value)
s_func = getattr(ClassBase, 'show')
s_func()
c_func = getattr(ClassBase, 'c_method')
c_func()
# 这些都没问题
setattr(ClassBase, 'has_girlfriend', True) # 添加静态成员
print(ClassBase.has_girlfriend) # True
# ---------------同理，模块也是对象-------------
# 我新建了一个模块s1.py，我把内容复制下来
# class S1:
#   def __init__(self):
#     self.name = 'aaa'
#     self.age = 22
#
#   def show(self):
#     print(self.name)
#     print(self.age)
#
#
# def func1():
#   print('page1')
#
#
# def func2():
#   print('page2')
# 一个类，两函数
import s1
s1_class = getattr(s1, 'S1', None)
if s1_class is not None:
  c1 = s1_class()
  c1.show()
  # aaa
  # 22
getattr(s1, 'func1')() # page1
f2 = 'func2'
if hasattr(s1, f2):
  getattr(s1, 'func2')() # page2

注释中说明的s1.py如下：

# -*- coding:utf-8 -*-
#!python3
class S1:
  def __init__(self):
    self.name = 'aaa'
    self.age = 22
  def show(self):
    print(self.name)
    print(self.age)
def func1():
  print('page1')
def func2():
  print('page2')
# 一个类，两函数

程序运行结果：