I call the curve_fit function like this.

```
popt, pcov = curve_fit(asymmetricLogistic, xData, yDataFixed, predictions)
```

In the documentation it says that the number function calls is returned, but I can’t seem to get hold of it.

*infodict dict (returned only if full_output is True)*

*a dictionary of optional outputs with the keys:*

`nfev`

*The number of function calls. Methods ‘trf’ and ‘dogbox’ do not count function calls for numerical Jacobian approximation, as opposed to ‘lm’ method.*

How do I catch **nfev** from a curve_fit call?

Thanks