Assignment_18.py

1. Create a `zoo.py` file and define the `hours()` function that prints the string `'Open 9-5 daily'`. Then, use the interactive interpreter to import the `zoo` module and call its `hours()` function.

```python
# zoo.py
def hours():
    print('Open 9-5 daily')
```

In the interactive interpreter:

```python
>>> import zoo
>>> zoo.hours()
Open 9-5 daily
```

2. In the interactive interpreter, import the `zoo` module as `menagerie` and call its `hours()` function.

```python
>>> import zoo as menagerie
>>> menagerie.hours()
Open 9-5 daily
```

3. Using the interpreter, explicitly import and call the `hours()` function from `zoo`.

```python
>>> from zoo import hours
>>> hours()
Open 9-5 daily
```

4. Import the `hours()` function as `info` and call it.

```python
>>> from zoo import hours as info
>>> info()
Open 9-5 daily
```

5. Create a plain dictionary with the key-value pairs `'a': 1, 'b': 2, and 'c': 3`, and print it out.

```python
>>> plain_dict = {'a': 1, 'b': 2, 'c': 3}
>>> print(plain_dict)
{'a': 1, 'b': 2, 'c': 3}
```

6. Make an `OrderedDict` called `fancy` from the same pairs listed in 5 and print it. Did it print in the same order as `plain`?

```python
>>> from collections import OrderedDict
>>> fancy = OrderedDict([('a', 1), ('b', 2), ('c', 3)])
>>> print(fancy)
OrderedDict([('a', 1), ('b', 2), ('c', 3)])
```

The `OrderedDict` prints the key-value pairs in the order they were added, which is different from the order in the plain dictionary.

7. Make a `defaultdict` called `dict_of_lists` and pass it the argument `list`. Make the list `dict_of_lists['a']` and append the value `'something for a'` to it in one assignment. Print `dict_of_lists['a']`.

```python
>>> from collections import defaultdict
>>> dict_of_lists = defaultdict(list)
>>> dict_of_lists['a'].append('something for a')
>>> print(dict_of_lists['a'])
['something for a']
```

The `defaultdict` automatically creates a new list for the key `'a'` when it is accessed for the first time, and we can then append a value to it.