using with to open and close an object
Objects - Intermediate example from a Well House Consultants training course
More on Objects - Intermediate [link]
Source code: dayzend Module: Y112
self.values = range(1,top+1)
self.values = 
# Big list in "trax" while it's used
with trackorder(7) as trax:
for t in trax.values:
print("Length within block: " + str(len(trax.values)))
# gone away outside the "with" area
print("Length outside block: " + str(len(trax.values)))
""" Sample output
WomanWithCat:q3 grahamellis$ python3 dayzend
<__main__.trackorder object at 0x10073a320>
Length within block: 7
Length outside block: 0
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