Python - 변수 존재 유무 확인

 

방법1. Try Exception

  try :  
     thevariable 
  exception NameError : 
     print('was not defined')
  else : 
     print('it is defined')

 

방법2. 전체 목록에서 찾기

if('var1' in locals()):
	print('it is defined1')
if('var2' in globals()):
    print('it is defined2')
if('var2' in vars()):
    print('it is defined3')

 

방법3. 멤버변수 확인

if('attr_name' in dir(classobj)):
    print('it is defined')
if(hasattr(classobj,'attr_name')):
    print('it is defined')