timeit.repeat

timeit.repeat默认会执行3轮，每轮执行1000000次。返回每轮的总执行时间列表

字典获取性能

大家都知道字典获取分为

中括号获取，获取不到会抛出KeyError

get获取，获取不到会返回默认值

下面比较两种获取方式的性能

数据准备

一条简单一条复杂

# logging标准库的level字典
level_mapping = {\'CRITICAL\': 50, \'FATAL\': 50, \'ERROR\': 40, \'WARN\': 30, \'WARNING\': 30, \'INFO\': 20, \'DEBUG\': 10, \'NOTSET\': 0}
# elasticsearch日志
record = {\'_index\': \'logstash-project.test-env.release-user.root-2021\', \'_type\': \'doc\', \'_id\': \'2f60jn0BaH-cdSPUSkiF\', \'_version\': 1, \'_score\': None, \'_source\': {\'method\': \'GET\', \'index_name\': \'project.test-env.release-user.root\', \'@version\': \'flask\', \'path\': \'D:\\\\alpha\\\\flask\\\\logstash\\\\core\\\\flask.py\', \'logger_name\': \'flask.exception\', \'stack_info\': None, \'user\': \'root\', \'@timestamp\': \'2021-12-06T07:45:20.056Z\', \'level\': \'ERROR\', \'thread_name\': \'Thread-5\', \'type\': \'exception\', \'env\': \'release\', \'process\': 8716, \'funcName\': \'exceptions\', \'port\': 55792, \'project\': \'test\', \'tags\': [], \'lineno\': 89, \'request\': {\'headers\': {\'Accept-Encoding\': \'gzip, deflate, br\', \'Connection\': \'keep-alive\', \'Postman-Token\': \'359faa6e-9527-4de7-82ff-eecb92656875\', \'User-Agent\': \'PostmanRuntime/7.28.4\', \'Cookie\': \'csrftoken=bf58fmaG5wBVabJwBeD8srVsfw7EjKe0VN7xD8mu817UzVm\', \'Accept\': \'*/*\', \'Host\': \'127.0.0.1:5000\'}, \'args\': {\'a\': \'11\', \'b\': \'22\'}}, \'message\': \'division by zero\', \'host\': \'DESKTOP-JCQ9527\', \'status_code\': 500, \'stack_trace\': \'Traceback (most recent call last):\\n File \"D:\\\\Envs\\\\logstash\\\\lib\\\\site-packages\\\\flask\\\\app.py\", line 1950, in full_dispatch_request\\n rv = self.dispatch_request()\\n File \"D:\\\\Envs\\\\logstash\\\\lib\\\\site-packages\\\\flask\\\\app.py\", line 1936, in dispatch_request\\n return self.view_functions[rule.endpoint](**req.view_args)\\n File \"D:\\\\flask\\\\logstash\\\\app.py\", line 112, in get_raise\\n a/0\\nZeroDivisionError: division by zero\\n\', \'remote_addr\': \'127.0.0.1\', \'url\': \'http://127.0.0.1:5000/raise?a=11&b=22\'}, \'fields\': {\'@timestamp\': [\'2021-12-06T07:45:20.056Z\']}, \'sort\': [1638776720056]}

来源：https://www.cnblogs.com/viete/p/15667036.html
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