我写了这个,它不断给我错误:
import usb.util
from time import sleep
TOYPAD_INIT = [0x55, 0x0f, 0xb0, 0x01, 0x28, 0x63, 0x29, 0x20, 0x4c, 0x45, 0x47, 0x4f, 0x20, 0x32, 0x30, 0x31, 0x34, 0xf7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
OFF = [0,0,0]
RED = [255,0,0]
GREEN = [0,255,0]
BLUE = [0,0,255]
ALL_PADS = 0
CENTER_PAD = 1
LEFT_PAD = 2
RIGHT_PAD = 3
# Actions
TAG_INSERTED = 0
TAG_REMOVED = 1
# UIDs can be retrieved with Android App (most probably in hexadecimal)
uidDarthVader = (4, 161, 158, 210, 227, 64 , 128) # Darth Vader from Disney Infinity 3.0
def init_usb():
global dev
dev = usb.core.find(idVendor=0x0e6f, idProduct=0x0241)
if dev is None:
print('Device not found')
else:
if dev.is_kernel_driver_active(0):
dev.detach_kernel_driver(0)
print(usb.util.get_string(dev, dev.iProduct))
dev.set_configuration()
dev.write(1,TOYPAD_INIT)
return dev
def send_command(dev,command):
# calculate checksum
checksum = 0
for word in command:
checksum = checksum + word
if checksum >= 256:
checksum -= 256
message = command+[checksum]
# pad message
while(len(message) < 32):
message.append(0x00)
# send message
dev.write(1, message)
return
def switch_pad(pad, colour):
send_command(dev,[0x55, 0x06, 0xc0, 0x02, pad, colour[0], colour[1], colour[2],])
return
def uid_compare(uid1, uid2):
match = True
for i in range(0,7):
if (uid1[i] != uid2[i]) :
match = False
return match
def main():
init_usb()
if dev != None :
while True:
try:
in_packet = dev.read(0x81, 32, timeout = 10)
bytelist = list(in_packet)
if not bytelist:
pass
elif bytelist[0] != 0x56: # NFC packets start with 0x56
pass
else:
pad_num = bytelist[2]
uid_bytes = bytelist[6:13]
match = uid_compare(uid_bytes, uidDarthVader)
action = bytelist[5]
if action == TAG_INSERTED :
if match:
# Darth Vader
switch_pad(pad_num, RED)
else:
# some other tag
switch_pad(pad_num, GREEN)
else:
# some tag removed
switch_pad(pad_num, OFF)
except(usb.USBError, err):
pass
switch_pad(ALL_PADS,OFF)
return
if __name__ == '__main__':
main()
并获得以下两个错误之一:
NameError:未定义名称“ err”
或
except usb.USBError, err:
^
SyntaxError: invalid syntax
那是为什么?我的目标是将其用于我正在开发的一项技术。我曾尝试在网上查找任何内容,然后尝试重新格式化代码仍然无法正常工作,最后我尝试使用代码格式化助手,但仍然无济于事。
答案 0 :(得分:0)
您的错误是由于变量err
未定义而导致的。
在这里我可以复制错误:
In [7]: try:
...: raise SyntaxError
...: except(SyntaxError, err):
...: print("Error message")
...:
---------------------------------------------------------------------------
SyntaxError Traceback (most recent call last)
<ipython-input-7-7c18a68f8815> in <module>
1 try:
----> 2 raise SyntaxError
3 except(SyntaxError, err):
SyntaxError: None
During handling of the above exception, another exception occurred:
NameError Traceback (most recent call last)
<ipython-input-7-7c18a68f8815> in <module>
1 try:
2 raise SyntaxError
----> 3 except(SyntaxError, err):
4 print("Error message")
5
NameError: name 'err' is not defined
相反,尝试删除err,您的except行应显示为
except(SyntaxError):
您还应该知道,复制粘贴的代码所在的github存储库位于python 2中,因此这很可能就是您看到此错误的原因。
这里是link to the source,我已自由地修复语法突出显示。