我正在尝试 python qreader 模块，但每次我尝试运行它时，我都会收到 SyntaxError: (unicode error) 'unicodeescape' codec can't Decode bytes inposition 2-3: truncated \UXXXXXXXX escape error.
from qreader import QReader
from cv2 import QRCodeDetector, imread
from pyzbar.pyzbar import decode
# Initialize the three tested readers (QRReader, OpenCV and pyzbar)
qreader_reader, cv2_reader, pyzbar_reader = QReader(), QRCodeDetector(), decode
for img_path in ('C:\Users\Blabla\Desktop\code\python_shit\out.png'):
# Read the image
img = imread(img_path)
# Try to decode the QR code with the three readers
qreader_out = qreader_reader.detect_and_decode(image=img)
cv2_out = cv2_reader.detectAndDecode(img=img)[0]
pyzbar_out = pyzbar_reader(image=img)
# Read the content of the pyzbar output (double decoding will save you from a lot of wrongly decoded characters)
pyzbar_out = tuple(out.data.data.decode('utf-8').encode('shift-jis').decode('utf-8') for out in pyzbar_out)
# Print the results
print(f"Image: {img_path} -> QReader: {qreader_out}. OpenCV: {cv2_out}. pyzbar: {pyzbar_out}.")
how can我解决这个问题了吗？
我有点迷失了，我不知道该怎么办
The error message "SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape" usually occurs when you have a raw string literal containing a backslash followed by a 'U' character in your file path.
The problem lies in how Windows represents file paths and how Python interprets backslashes. Here's the breakdown:
-
Windows File Paths:
Windows uses backslashes (
\) as path separators. -
Python String Literals:
Python interprets a backslash (
\) as an escape character. So, when it encounters\Uin your file path, it tries to interpret it as a Unicode escape sequence. However,\Urequires eight hexadecimal digits to be a valid Unicode escape sequence, leading to the "truncated \UXXXXXXXX escape" error.
Here are a few ways to fix this issue:
1. Use Raw Strings:
Prefix your file path string with an
r
to make it a raw string. Raw strings treat backslashes literally.
python
img_path = r'C:\Users\Blabla\Desktop\code\python_shit\out.png'
img = imread(img_path)
2. Use Forward Slashes:
Python accepts forward slashes (
/
) as path separators on all operating systems, including Windows.
python
img_path = 'C:/Users/Blabla/Desktop/code/python_shit/out.png'
img = imread(img_path)
3. Escape the Backslashes:
Use double backslashes (
\\
) to represent a single backslash in your file path.
python
img_path = 'C:\\Users\\Blabla\\Desktop\\code\\python_shit\\out.png'
img = imread(img_path)
Choose one of these methods to modify your
img_path
variable, and the error should be resolved.
Remember to use the chosen method consistently throughout your code when handling file paths.