Round a floating-point number down to the nearest integer?

by 
int(x)

Conversion to integer will truncate (towards 0.0), like math.trunc.
For non-negative numbers, this is downward.

If your number can be negative, this will round the magnitude downward, unlike math.floor which rounds towards -Infinity, making a lower value. (Less positive or more negative).

Python integers are arbitrary precision, so even very large floats can be represented as integers. (Unlike in other languages where this idiom could fail for floats larger than the largest value for an integer type.)

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