PHP4->PHP5 was a big breaking change as well. It took several years for all projects nad hosting companies to upgrade and switch to v5 by default.
But there was a strong push from developers. I don't see that happening when Python developers' attitude is "Meh, Python 2 is all right, I don't need to upgrade anything ever".
Python 2 is nowhere near as lacking as PHP4. Which is probably a big part. But even then it took a big campaign and large software like Wordpress declaring that they would go PHP5 only.
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PHP4->PHP5 was a big breaking change as well. It took several years for all projects nad hosting companies to upgrade and switch to v5 by default.
But there was a strong push from developers. I don't see that happening when Python developers' attitude is "Meh, Python 2 is all right, I don't need to upgrade anything ever".
Python 2 is nowhere near as lacking as PHP4. Which is probably a big part. But even then it took a big campaign and large software like Wordpress declaring that they would go PHP5 only.