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Code reviewHardcr-p026
Subject ConcurrencyLevel Senior~18 minCommon in Concurrency interviewsIndustries Software development

Question

Review this lazily-initialized singleton used from multiple threads.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.

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Code to reviewpython
_instance = None def get_instance():    global _instance    if _instance is None:        _instance = ExpensiveClient()    return _instance
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