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This will help ensure that no extra children (zombies) stick around to hog resources and create problems when looking for refleaks. waitpidWNOHANGNTrrz%reap_children() reaped child process )rrr"rrrrenvironment_altered)r<statuss r[r:r:s} B "wr9'= #  **R4KC !8 =cUCD"    s'A)) A54A5c#2Kt||r,t||}t||| |t|||yt||| dt||r t||yy#t|||wxYw#t||r t||wwxYww)aTemporary swap out an attribute with a new object. Usage: with swap_attr(obj, "attr", 5): ... This will set obj.attr to 5 for the duration of the with: block, restoring the old value at the end of the block. If `attr` doesn't exist on `obj`, it will be created and then deleted at the end of the block. The old value (or None if it doesn't exist) will be assigned to the target of the "as" clause, if there is one. N)rrrdelattr)rattrnew_valreal_vals r[r?r?s sD3%T7# )N Cx (T7# # sD!T"" Cx ( sD!T""s3&BA'B A9 B'A66B9BBc#K||vr||}|||< ||||<y|||< d||vr||=yy#|||<wxYw#||vr||=wwxYww)aTemporary swap out an item with a new object. 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Example: for _ in support.busy_retry(support.SHORT_TIMEOUT): if check(): break Example of error=False usage: for _ in support.busy_retry(support.SHORT_TIMEOUT, error=False): if check(): break else: raise RuntimeError('my custom error') rz!timeout must be greater than zeroNz timeout (rz seconds)r)rrrr)rerr_msgrrdeadlinerrbs r[ busy_retryr, s,!|<==!JG#H  >> x '    ^^  *"S+ EG9%CS!!  sA=A?g{Gz?g?) init_delay max_delayrc#K|}t|||D]*}dtj|t|dz|},yw)a Wait strategy that applies exponential backoff. Run the loop body until "break" stops the loop. Sleep at each loop iteration, but not at the first iteration. The sleep delay is doubled at each iteration (up to *max_delay* seconds). See busy_retry() documentation for the parameters usage. 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