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class CtxMgr:
def __init__(self, id):
self.id = id
def __enter__(self):
print("__enter__", self.id)
return self
def __exit__(self, a, b, c):
print("__exit__", self.id, repr(a), repr(b))
# simple case
def foo():
with CtxMgr(1):
return 4
print(foo())
# for loop within with (iterator needs removing upon return)
def f():
with CtxMgr(1):
for i in [1, 2]:
return i
print(f())
# multiple for loops within with
def f():
with CtxMgr(1):
for i in [1, 2]:
for j in [3, 4]:
return (i, j)
print(f())
# multiple for loops within nested with's
def f():
with CtxMgr(1):
for i in [1, 2]:
for j in [3, 4]:
with CtxMgr(2):
for k in [5, 6]:
for l in [7, 8]:
return (i, j, k, l)
print(f())
# multiple for loops that are optimised, and nested with's
def f():
with CtxMgr(1):
for i in range(1, 3):
for j in range(3, 5):
with CtxMgr(2):
for k in range(5, 7):
for l in range(7, 9):
return (i, j, k, l)
print(f())
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