Like Java's reflection mechanism, python can also obtain objects/functions and object attributes through reflection.
The method of use is also simpler than Java, and it is OK to directly obtain it through a fixed python built-in function.
Before starting, you first need to look at these four built-in functions in python, through which you can complete object processing.
getattr函数：获取对象属性/对象方法
hasattr函数：判断对象是否有存在对应的属性及方法
delattr函数：删除指定的属性
setattr函数：为对象设置内容
Then, create a python class object TestCode, use reflection to get the object and process it.
# It's importing the time module.
import time
class TestCode():
def __init__(self):
"""
A constructor. It is called when an object is created from a class and it allows the class to initialize the
attributes of a class.
"""
self.source_code = 'Python 集中营'
self.source_tag = '公众号'
def show_now_time(self):
"""
It shows the current time.
"""
print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
Finally, use the main function of the python module to process the TestCode object we have created above through reflection.
if __name__ == '__main__':
test_ = TestCode()
# Checking if the object `test_` has the attribute `source_code`.
if hasattr(test_, 'source_code'):
# Printing the string `TestCode对象存在{}属性。` and replacing the `{}` with the string `source_code`.
print('TestCode对象存在{}属性。'.format('source_code'))
# Getting the attribute `source_code` from the object `test_`.
source_code = getattr(test_, 'source_code')
# Printing the string `TestCode对象source_code属性的值是：{}` and replacing the `{}` with the string `source_code`.
print('TestCode对象source_code属性的值是：{}'.format(str(source_code)))
# Setting the attribute `source_tag` of the object `test_` to the string `GONGZHONGHAO`.
setattr(test_, 'source_tag', 'GONGZHONGHAO')
# Deleting the attribute `source_code` from the object `test_`.
delattr(test_, 'source_code')
if hasattr(test_, 'source_code'):
print('TestCode对象存在{}属性。'.format('source_code'))
else:
print('TestCode对象不存在{}属性。'.format('source_code'))
After finishing the work, execute the main function call and find that all reflection executions have taken effect. The following is the data result printed after execution.
TestCode对象存在source_code属性。
TestCode对象source_code属性的值是：Python 集中营
TestCode对象不存在source_code属性。
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