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I am working on a function to find the slope of a line if given x1, y1 and x2, y2. Not too hard. But I need the results to be floating point not integers even though the x and y inputs are integers. I have :

```
def slope(x1, y1, x2, y2):
"""
>>> slope(5, 3, 4, 2)
1.0
>>> slope(1, 2, 3, 2)
0.0
>>> slope(1, 2, 3, 3)
0.5
>>> slope(2, 4, 1, 2)
2.0
"""
y = y2 - y1
x = x2 - x1
m = y / x
return m
```

The comment inside the definition is what I am really working on (testing functions), but not my problem right now. It fails the test because it expects 1.0 as the first answer and as an integer gets 1. I tried making m into float(m), but get an error that I can't call a function right there. How do I turn a variable into a floating decimal number?