# 74. Мутация: Проверка на „Equation“

Мутация за проверка на кода на Уравнението. Двигателят за Уравнения е изграден върху `python` език с поддръжка на общи математически операции. 

Списък на поддържаните операции:

1. Основен модул на Python: abs, all, any, bin, bool, bytearray, bytes, chr, complex, dict, dir, divmod, enumerate, filter, float, format, frozenset, hash, hex, id, int, isinstance, len, list, map, max, min, oct, ord, pow, range, repr, reversed, round, set, slice, sorted, str, sum, tuple, type, zip.
2. Модул math на Python: acos, acosh, asin, asinh, atan, atan2, atanh, ceil, copysign, cos, cosh, degrees, e, exp, fabs, factorial, floor, fmod, frexp, fsum, hypot, isinf, isnan, ldexp, log, log10, log1p, modf, pi, pow, radians, sin, sinh, sqrt, tan, tanh, trunc.
3. Условия в Python: if, elif, else.
4. Цикли в Python: for, while.

{% hint style="danger" %}
`equationAsText` трябва да бъде обградено в """\<equation>""" и кодът трябва да е в стил на базиран на Python.&#x20;

Запазете само необходимата табулация и разстояния.
{% endhint %}

{% code overflow="wrap" lineNumbers="true" %}

```graphql
mutation VerifyEquation {
  verifyEquation(input: {
    dataVariables: [{
      variable: "yield_vol"
      sampleValue: 1.1 
    }, {
      variable: "prod"
      sampleValue: 2.2
    }]
    equationAsText: """calculated = yield_vol/prod + 3.5 
if calculated >= 30:
    result = 35
elif calculated >= 20 and calculated < 30:
    result = 25
else:
    result = 15
    """
    equationResultVariable: "result"
  }) {
    executed
    result
    errorMessage
  }
}
```

{% endcode %}


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