Python报错：(unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXX

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于 2019-09-17 11:12:21 发布 · 1.3k 阅读

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在VScode中使用Python3.6时，遇到调试错误：(unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated UXXXXX。该错误源于文件路径读取，解决方案是在文件路径前添加前缀'r'，以避免Unicode转义。

IDE： VScode
环境：python3.6
启动调试报错：

(unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

在这里插入图片描述
调试代码发现是读取文件路径问题，只要在文件路径前加一个 r 即可。
原代码

#coding=utf-8
import cv2
import numpy as np

def CannyThreshold(lowThreshold):
    detected_edges = cv2.GaussianBlur(gray, (3, 3), 0)
    detected_edges = cv2.Canny(
        detected_edges, lowThreshold, lowThreshold*ratio, apertureSize=kernel_size)
    # just add some colours to edges from original image.
    dst = cv2.bitwise_and(img, img, mask=detected_edges)
    cv2.imshow('canny demo', dst)


lowThreshold = 0
max_lowThreshold = 100
ratio = 3
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