# 74. Mutation : vérifier « Equation »

Mutation pour vérifier le code de l'Équation. Le moteur Equation est construit sur `python` langage avec le support des opérations mathématiques courantes. 

La liste des opérations prises en charge :

1. module de base 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. module math de 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. conditions Python : if, elif, else.
4. boucles Python : for, while.

{% hint style="danger" %}
`equationAsText` doit être entouré par """\<equation>""" et le code doit être stylé en python.&#x20;

Conserver uniquement la tabulation et les espaces nécessaires.
{% 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:
    resultat = 35
elif calculated >= 20 and calculated < 30:
    resultat = 25
sinon :
    resultat = 15
    """
    equationResultVariable: "result"
  }) {
    exécuté
    résultat
    message d'erreur
  }
}
```

{% endcode %}


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