Python crawler: urllib.error.HTTPError : HTTP Error 404: Not Found

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Python crawler: urllib.error.httperror: HTTP error 404: Not Found

See a 404 error, I am also very depressed, and read the code and again, there is no problem, as the small white, the most afraid of this kind of error, but after the attack, full of a sense of accomplishment, nonsense not much said, so is the Internet search the cause of the error, the answer is multifarious, but still find the feeling, that is to see if the address was wrong.
the truth is there’s something wrong with the address. You want to cry.

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