# Python math library | isfinite() and remainder() method

Python has math library and has many functions regarding to it. `math.remainder()` method returns an exact (floating) value as a remainder.

Syntax:

`math.remainder(x, y)`

For finite x and finite nonzero y, this is the difference x – n*y, where n is the closest integer to the exact value of the quotient x / y. If x / y is exactly halfway between two consecutive integers, the nearest even integer is used for n. The remainder `r = remainder(x, y)` thus always satisfies abs(r) <= 0.5 * abs(y).

 `# Importing Math module ` `import` `math ` ` `  `# printing remainder of two values ` `print``(math.remainder(``5``, ``2``)) ` `print``(math.remainder(``10``, ``5``)) ` `print``(math.remainder(``12``, ``7``)) ` `print``(math.remainder(``6``, ``2``)) `

Output:

```1.0
0.0
-2.0
0.0
```

### math.isfinite() function –

Syntax:

`math.isfinite(x)`

`math.isfinite()` method returns True if x is neither an infinity nor a NaN, and False otherwise. (Note that 0.0 is considered finite.)

 `# Importing Math module ` `import` `math ` ` `  `# printing remainder of two values ` `print``(math.isfinite(``5``)) ` `print``(math.isfinite(``float``(``'nan'``))) ` `print``(math.isfinite(``-``2.5``)) ` `print``(math.isfinite(``0.0``)) `

Output:

```True
False
True
True
```

Reference: Python Math Library

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