It’s very easy to add thousands separators to numbers:
```python import collections c = collections.Counter(‘helloworld’)
You can use the environment markers to achieve this in requirements.txt since pip 6.0:
In many applications += and append are interchangeable, but for Python lists they are not.
Assignment statements in Python do not copy objects, they create bindings between a target and an object. For collections that are mutable or contain muta...