如何从pyzbar的decode结果中提取二维码的Rect坐标？

Hey there! Let's work through your two issues with pyzbar and Spyder step by step:

1. Extracting the rect Part from Decoded QR Code Data #

First, let's break down what your test variable contains:

[Decoded(data=b'Part4', type='QRCODE', rect=Rect(left=172, top=332, width=75, height=76))]

This is a list holding one Decoded object. To get the rect data, you just need to access the object's rect attribute after grabbing it from the list. Here's how to do it in code:

from pyzbar.pyzbar import decode

# Your existing code
test = decode(img)

# Make sure we have a decoded result first to avoid errors
if test:
    # Get the first (and only, in your case) Decoded object
    decoded_item = test[0]
    # Extract the Rect object
    qr_rect = decoded_item.rect
    
    # Print the full Rect info
    print(qr_rect)  # Output: Rect(left=172, top=332, width=75, height=76)
    
    # If you need individual values (left, top, width, height), access them directly:
    qr_left = qr_rect.left
    qr_top = qr_rect.top
    qr_width = qr_rect.width
    qr_height = qr_rect.height
    
    print(f"QR Code Position: Left={qr_left}, Top={qr_top}, Size={qr_width}x{qr_height}")

The Rect object from pyzbar is a simple class with public attributes, so you can access each coordinate/size value using dot notation.

2. Fixing Spyder Variable Viewer Error #

The error you're seeing in Spyder's variable viewer is likely because pyzbar's Decoded and Rect objects are C extension types (not pure Python objects). Spyder's viewer sometimes struggles to parse these non-native types.

Here are a few quick fixes:

• Convert to a Python dictionary: Turn the Rect data into a standard dict that Spyder can display easily:

  rect_dict = {
      "left": qr_rect.left,
      "top": qr_rect.top,
      "width": qr_rect.width,
      "height": qr_rect.height
  }
  

  Now you can inspect rect_dict in the variable viewer without issues.
• Update Spyder: Older versions of Spyder have better support for non-Python types in newer releases. Updating to the latest version might resolve the parsing error.
• Use print statements for debugging: If you just need to check values quickly, printing the individual attributes (like we did above) is a reliable workaround.

内容的提问来源于stack exchange，提问作者Sam