python模块中dir()函数的使用

import Titan
 
print(dir(Titan))
 
# 输出结果:
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'age', 'name', 'sayBad', 'sayGood', 'sayNice']
 
 
print(dir())
# 输出结果:
['Titan', '__annotations__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']
 
 
# 这里定义一个新的变量
sum = 30
print(dir())
# 输出结果:
['Titan', '__annotations__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'sum']
 
 
# 把定义的变量删除后
del sum
print(dir())
# 输出结果:
['Titan', '__annotations__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']