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    Lab 9: Aside: range, arange
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# Lab 9: Aside: range, arange

Early on in this semester, we learned that the built-in Python function `range` can be used to generate a list of integers:

```py
range(4) # [0,1,2,3]
```

The module `numpy` has a similar function called `arange`, which is just like range except it has the ability to create floating point numbers in addition to whole numbers.

```py
# Don't forget to add this import at the top of your file!
import numpy as np

np.arange(4) # [0,1,2,3]

# Force floating point numbers
np.arange(4.0) # [ 0., 1., 2., 3.]

# Use + .5 to add .5 to each number in the list; useful for positioning bar charts!
np.arange(4) + .5 # [ 0.5,  1.5,  2.5,  3.5]
```

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