This error occurs when the function expects a single value and not an array of values to convert.

For example if we want to convert the following vector below.

```
import numpy as np
x = np.array([2, 3, 5, 7, 11, 13, 17, 19, 23])
print (np.int(x))
# --> TypeError: only size-1 arrays can be converted to Python scalars.
```

In order to get around this we can use the astype() function instead.

```
import numpy as np
x = np.array([2, 3, 5, 7, 11, 13, 17, 19, 23])
#convert array of values to integer values.
x.astype(int)
print (x)
```

Note however that the x.astype(int) converts to integer values. If we want to keep any floating values in our array we should use the x.astype(float) instead.

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