python - urllib爬虫下载图片，很简单的程序，但是输出结果却不定，很奇怪

Answer 1

1. I measured it three times and it was 131 130

2. The output may be random (one time 121 120, another time 131 130), or it was 121 120 several times before, and then it became 131 130

3. I wonder if it’s because new pictures have been added

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Questions I answered: Python-QA