'How does "-float" works?
I have just seen a code in my homework. It says result=-float("inf"). I don't really understand what -float means.
Solution 1:[1]
It's not -float, it's -float(...).
float(x) makes a floating-point number from x. Here, float("inf") represents positive infinity, so the - negates it and you get negative infinity.
Another way to get negative infinity is float("-inf").
For reference, see operator precedence in the docs. A call is more tightly binding than unary negation.
Solution 2:[2]
float is a built-in function in Python that returns a floating point number constructed from a number or string.
float("inf") returns the floating-point representation of positive infinity, so -float("inf") is how you can get negative infinity.
There are a number of Built-in Functions in Python that it pays to be familiar with.
Sources
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Source: Stack Overflow
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