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‎working-with-the-python-operator-module/README.md‎

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# Working With the Python operator Module
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This folder contains supplementary code for the Real Python tutorial on [Working With the Python operator Module](https://realpython.com/python-operator-module/). You can copy the code examples, or continue your learning by experimenting more with them.
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## Setup
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Create and activate a virtual environment.
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```bash
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$ python -m venv venv
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$ source venv/bin/activate
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```
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For most of the examples, you'll use the `operator`, `pickle`, 'dataclasses' and `timeit` modules. All of these come built in to Python. No additional installation is necessary.
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## Usage
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After creating and activating your virtual environment, you should be able to run each individual file normally:
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```bash
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(venv) $ python filename.py
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```
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You can find more information and context on the code blocks in [Working With the Python operator Module](https://realpython.com/python-operator-module/).

‎working-with-the-python-operator-module/attrgetter_min_max.py‎

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from dataclasses import dataclass
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@dataclass
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class Musician:
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id: int
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fname: str
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lname: str
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group: str
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musicians_list = [
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[1, "Brian", "Wilson", "Beach Boys"],
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[2, "Carl", "Wilson", "Beach Boys"],
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[3, "Dennis", "Wilson", "Beach Boys"],
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[4, "Bruce", "Johnston", "Beach Boys"],
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[5, "Hank", "Marvin", "Shadows"],
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[6, "Bruce", "Welch", "Shadows"],
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[7, "Brian", "Bennett", "Shadows"],
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]
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group_members = []
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for musician in musicians_list:
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group_members.append(Musician(*musician))
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import operator
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from dataclasses import dataclass
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@dataclass
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class Musician:
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id: int
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fname: str
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lname: str
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group: str
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musicians_list = [
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[1, "Brian", "Wilson", "Beach Boys"],
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[2, "Carl", "Wilson", "Beach Boys"],
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[3, "Dennis", "Wilson", "Beach Boys"],
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[4, "Bruce", "Johnston", "Beach Boys"],
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[5, "Hank", "Marvin", "Shadows"],
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[6, "Bruce", "Welch", "Shadows"],
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[7, "Brian", "Bennett", "Shadows"],
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]
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group_members = []
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for musician in musicians_list:
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group_members.append(Musician(*musician))
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import operator
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get_id = operator.attrgetter("id")
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print(min(group_members, key=get_id))
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print(max(group_members, key=get_id))

‎working-with-the-python-operator-module/attrgetter_selecting.py‎

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from dataclasses import dataclass
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@dataclass
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class Musician:
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id: int
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fname: str
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lname: str
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group: str
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musicians_list = [
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[1, "Brian", "Wilson", "Beach Boys"],
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[2, "Carl", "Wilson", "Beach Boys"],
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[3, "Dennis", "Wilson", "Beach Boys"],
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[4, "Bruce", "Johnston", "Beach Boys"],
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[5, "Hank", "Marvin", "Shadows"],
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[6, "Bruce", "Welch", "Shadows"],
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[7, "Brian", "Bennett", "Shadows"],
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]
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group_members = []
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for musician in musicians_list:
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group_members.append(Musician(*musician))
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import operator
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# Returning a single attribute.
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get_fname = operator.attrgetter("fname")
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for person in group_members:
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print(get_fname(person))
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# Returning multiple attributes.
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get_id_lname = operator.attrgetter("id", "lname")
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for person in group_members:
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print(get_id_lname(person))

‎working-with-the-python-operator-module/attrgetter_sorting.py‎

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from dataclasses import dataclass
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@dataclass
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class Musician:
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id: int
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fname: str
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lname: str
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group: str
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musicians_list = [
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[1, "Brian", "Wilson", "Beach Boys"],
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[2, "Carl", "Wilson", "Beach Boys"],
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[3, "Dennis", "Wilson", "Beach Boys"],
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[4, "Bruce", "Johnston", "Beach Boys"],
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[5, "Hank", "Marvin", "Shadows"],
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[6, "Bruce", "Welch", "Shadows"],
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[7, "Brian", "Bennett", "Shadows"],
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]
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group_members = []
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for musician in musicians_list:
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group_members.append(Musician(*musician))
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import operator
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# Sorting on a single attribute.
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get_id = operator.attrgetter("id")
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for musician in sorted(group_members, key=get_id, reverse=True):
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print(musician)

‎working-with-the-python-operator-module/calculate_modulus_deserialize_failed.py‎

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# De-serialize the function unsuccessfully.
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import pickle
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with open("calculate_modulus.pkl", "rb") as f:
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unpickled_modulus = pickle.load(f)
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print(unpickled_modulus(7, 4))

‎working-with-the-python-operator-module/calculate_modulus_deserialize_fixed.py‎

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# De-serialize the function successfully.
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import pickle
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def calculate_modulus(operand1, operand2):
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return operand1 % operand2
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with open("calculate_modulus.pkl", "rb") as f:
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unpickled_modulus = pickle.load(f)
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print(unpickled_modulus(7, 4))

‎working-with-the-python-operator-module/calculate_modulus_serialize_deserialize.py‎

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import pickle
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def calculate_modulus(operand1, operand2):
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return operand1 % operand2
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print(calculate_modulus(7, 4))
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with open("calculate_modulus.pkl", "wb") as f:
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pickle.dump(calculate_modulus, f)
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# De-serialize the function.
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with open("calculate_modulus.pkl", "rb") as f:
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unpickled_modulus = pickle.load(f)
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print(unpickled_modulus(7, 4))

‎working-with-the-python-operator-module/itemgetter_from_dictionary.py‎

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musicians = [
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{"id": 1, "fname": "Brian", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 2, "fname": "Carl", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 3, "fname": "Dennis", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 4, "fname": "Bruce", "lname": "Johnston", "group": "Beach Boys"},
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{"id": 5, "fname": "Hank", "lname": "Marvin", "group": "Shadows"},
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{"id": 6, "fname": "Bruce", "lname": "Welch", "group": "Shadows"},
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{"id": 7, "fname": "Brian", "lname": "Bennett", "group": "Shadows"},
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]
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import operator
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# Get a single element
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get_element_four = operator.itemgetter(4)
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print(get_element_four(musicians))
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# Get multiple elements
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get_elements_one_three_five = operator.itemgetter(1, 3, 5)
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print(get_elements_one_three_five(musicians))
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# Get values within elements
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get_names = operator.itemgetter("fname", "lname")
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for musician in get_elements_one_three_five(musicians):
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print(get_names(musician))

‎working-with-the-python-operator-module/itemgetter_in_min_max.py‎

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musicians_list = [
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[1, "Brian", "Wilson", "Beach Boys"],
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[2, "Carl", "Wilson", "Beach Boys"],
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[3, "Dennis", "Wilson", "Beach Boys"],
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[4, "Bruce", "Johnston", "Beach Boys"],
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[5, "Hank", "Marvin", "Shadows"],
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[6, "Bruce", "Welch", "Shadows"],
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[7, "Brian", "Bennett", "Shadows"],
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]
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get_id = operator.itemgetter(0)
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print(max(musicians_list, key=get_id))
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print(min(musicians_list, key=get_id))

‎working-with-the-python-operator-module/itemgetter_min_dictionary_value.py‎

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musicians = [
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{"id": 1, "fname": "Brian", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 2, "fname": "Carl", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 3, "fname": "Dennis", "lname": "Wilson", "group": "Beach Boys"},
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{"id": 4, "fname": "Bruce", "lname": "Johnston", "group": "Beach Boys"},
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{"id": 5, "fname": "Hank", "lname": "Marvin", "group": "Shadows"},
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{"id": 6, "fname": "Bruce", "lname": "Welch", "group": "Shadows"},
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{"id": 7, "fname": "Brian", "lname": "Bennett", "group": "Shadows"},
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]
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get_lname = operator.itemgetter("lname")
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min(musicians, key=get_lname)

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