[backtrader source code analysis 4] use Python to rewrite the first function of backtrader: time2num, which improves the efficiency by 2.2 times

The first time is always difficult , After stepping through many pits , Finally rewrite the first function time2num 了 , Efficiency has probably improved 2.2 times .

run 100000 Time , The cycle time is :0.0006515979766845703,cython Time consuming :0.012257814407348633,python The time spent is :0.027143001556396484, Calculate the multiple of partial promotion :2.214342675976893
run 1000000 Time , The cycle time is :0.006658792495727539,cython Time consuming :0.1207892894744873,python The time spent is :0.2682640552520752, Calculate the multiple of partial promotion :2.2209258488000048
run 10000000 Time , The cycle time is :0.06927633285522461,cython Time consuming :1.201690673828125,python The time spent is :2.6850152015686035, Calculate the multiple of partial promotion :2.2343646830637174

It is not a particularly high efficiency improvement , But on the whole, it is acceptable .

Implementation process

1. stay backtrader/utils Under the folder , To build a cython_func.pyx Used to save the files that need to be compiled cython Code
2. stay backtrader/utils Under the folder , Write a setup.py, Use python setup.py build_ext --inplace Compile
3. After compilation , Use python test_time2num.py

cython_func.pyx Code

from cpython.datetime c