Python API及相关问题

Python API及相关问题

## jupyter
jupyter nbconvert --to python my_file.ipynb
## 取整
# 向下取整
>>> a = 14.38
>>> int(a)
14
# 向上取整
>>> import math
>>> math.ceil(3.33)
4
>>> math.ceil(3.88)
4
# 四舍五入
>>> round(4.4)
4
>>> round(4.6)
5
## python3调用c函数接口的错误
# python2的源码直接在python3.7运行（出错）：
net = dn.load_net("cfg/yolov3.cfg", "weights/yolov3.weights", 0)
ctypes.ArgumentError: argument 1: <class 'TypeError'>: wrong type
## python3默认编码与python不一样, utf8转换：
net = dn.load_net("cfg/yolov3.cfg".encode("utf-8"), "weights/yolov3.weights".encode("utf-8"), 0)
import os.path as ops
os.path.abspath(path)        # 返回绝对路径
os.path.expanduser(path)     # 把path中包含的"~"和"~user"转换成用户目录
os.path.basename(path)       # 返回文件名