Although I'm a proficient JavaScript programmer now, the idea of curly brackets were genuinely intimidating. Just something about that made the program seem more complex than necessary, and Python seemed really clean.
I also think the book `How to Think Like a Computer Scientist` is a large part of Python's success for beginners. In the early days, it was literally the only programming learning book that clicked for me, and it was in Python. Up until then, programming still felt esoteric.