轻量级分析工具，用于检测python代码中的性能瓶颈。
bn的Python项目详细描述
因此得名：bn-瓶颈。 你知道B键和N键连续快速打字很舒服。
用法：
bn('loop')
for item in generator:
bn('rabbit')
# code of rabbit
bn('turtle')
# code of turtle
bn('loop')
if bn.total > 1.0:
logging.info(bn)
结果：
TOTAL=22.2632, turtle=20.6403, rabbit=1.6209, loop=0.0020
#
# This config is default in bn>=0.1.5:
# Bn(total_key='TOTAL', format='{key}={seconds:.4f}', sep=', ')
# OR:
22.2632 TOTAL
20.6403 turtle
1.6209 rabbit
0.0020 loop
#
# This config is default in bn<=0.1.4:
# Bn(total_key='TOTAL', format='{seconds:>10.4f} {key}', sep='\n')
安装：
pip install bn
范围：
# Global "bn" is useful to profile cross-module without passing "bn" explicitly.
from bn import bn
bn.format = custom_format
# Scoped "Bn" is useful to have multiple independent profilers.
from bn import Bn
def action():
bn = Bn(format=custom_format)
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