How can I tell if I am inside a context manager?

[Gerald Britton]

I'd like to know how (perhaps with the inspect module) I can tell if I
am running in a context manager.

e.g.

class f():
def __init__(s): pass
def __enter__(s): return s
def __exit__(s,a,b,c): return None

def g():
x = f()
# insert code here to return False, since I am not in a context
manager on f:
with h as f():
# insert code here to return True, since I am in a context manager on f:

 

[alex23]

I'd like to know how (perhaps with the inspect module) I can tell if I
am running in a context manager.

Actually, it occurs to me the simplest way is to use the context
manager itself to keep track:

class F(object):
def __init__(self):
self.in_context = False

def __enter__(self):
self.in_context = True
return self

def __exit__(self, exc_type, exc_val, exc_tb):
self.in_context = False

False

.... print f.in_context
....
TrueFalse

Hope this helps.