Somewhere else in your code you have something that looks like this:
```python
range = 5
```
or maybe
```python
str = 10
```
that is interpreted as meaning a function call on the object bound to `range` or `str`, which is an `int`. And that fails.
Somewhere else in your code you have something that looks like this:
round = 42
Then when you write
round((a/b)*0.9*c)
that is interpreted as meaning a function call on the object bound to `round`, which is an `int`. And that fails.
The problem is whatever code binds an `int` to the name `round`. Find that and remove it.