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that's also strange to me.

you are seeing this error because python is strong typing language.

but this is weird that java is also strong typing language[0]

0: https://en.m.wikipedia.org/wiki/Java_(programming_language)

Strong v weak typing isn't an absolute categorisation, it's a spectrum. There aren't many places Java will automatically coerce types, and the ones that do exist are narrow (numeric promotion, string concatenation, and I can't think of any others).

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