Python Context Managers

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Problem

python里的with怎么实现的

Asked in the coding round 1 stage. Same interviewer, Python internals.

Task

Implement context_manager_trace(should_raise, suppress_exception) using a custom context manager. It must record the order of __enter__, the with-body, and __exit__. If the body raises ValueError, __exit__ decides whether the exception is suppressed. The function must return the trace, including propagated when the exception escapes the with statement.

Contract

Input: two booleans. Output: a list of strings.

Constraints

should_raise and suppress_exception are booleans
The with-body raises either no exception or one ValueError
The returned trace contains at most four strings

Function Signature

def context_manager_trace(should_raise, suppress_exception):

Your solutionPython 3

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