如何检查Python变量是否存在？
我们使用以下代码检查python中是否存在变量。
示例
x =10
class foo:
g = 'rt'
def bar(self):
m=6
print (locals())
if 'm' in locals():
print ('m is local variable')
else:
print ('m is not a local variable')
f = foo()f.bar()
print (globals())
if hasattr(f, 'g'):
print ('g is an attribute')
else:
print ("g is not an attribute")
if 'x' in globals():
print ('x is a global variable')输出结果
我们得到以下输出
{'self': <__main__.foo instance at 0x0000000002E24EC8>, 'm': 6}
m is local variable
{'f': <__main__.foo instance at 0x0000000002E24EC8>, '__builtins__': <module '__builtin__' (built-in)>, '__file__': 'C:/Users/nhooo1/~.py', '__package__': None, 'x': 10, '__name__': '__main__', 'foo': <class __main__.foo at 0x0000000002D29828>, '__doc__': None}
g is an attribute
x is a global variable
Process finished with exit code 0热门推荐
1 如何训练狗狗不叫
2 训练狗狗不叫
3 训练狗狗随行
4 怎么训练狗狗不叫
7 训练比熊狗狗教程
10 上海狗狗训练
11 怎么训练狗狗上厕所
12 训练狗狗趴下
13 狗狗服从训练
14 训练狗狗拒食
15 训练狗狗笑
16 训练狗狗大便
17 训练狗狗立
18 训练狗狗捡东西