class Worker:
name = "Fox"
age = 52
profession = "Programmer"
o = Worker()
print(o.name)
print(o.age)
print(o.profession)
delattr(Worker, 'age')
print(o.name)
print(o.profession)
# print(o.age) # 'Worker' object has no attribute 'age'
'''
run:
Fox
52
Programmer
Fox
Programmer
'''