Glasgow | 25-SDC-NOV | Katarzyna Kazimierczuk | Sprint 5 | prep

.gitignore

@@ -1 +1,2 @@
 node_modules
+.DS_Store

individual-shell-tools/ls/script-02.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command which lists all of the files in the directory named child-directory.
 # The output should be a list of names: helper-1.txt, helper-2.txt, helper-3.txt.
+ls child-directory

jq/.gitignore

@@ -0,0 +1 @@
+.DS_Store

prep/1_double("22").py

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+# ✍️exercise
+# Predict what double("22") will do. Then run the code and check. Did it do what you expected? 
+# Why did it return the value it did?
+
+def double(value):
+    return value * 2 
+
+#2222
+
+print(double("22"))

prep/1_double_bug.py

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+# ✍️exercise
+# Read the above code and write down what the bug is. 
+# How would you fix it?
+
+def double(number):
+    return number * 3
+
+print(double(10))
+
+#Either call it tripple or * 2

prep/2_type_bugs.py

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+# ✍️exercise
+# Do not run the following code.
+
+# This code contains bugs related to types. They are bugs mypy can catch.
+
+# Read this code to understand what it’s trying to do. 
+# Add type annotations to the method parameters and return types of this code. 
+# Run the code through mypy, and fix all of the bugs that show up. 
+# When you’re confident all of the type annotations are correct, and the bugs are fixed, 
+# run the code and check it works.
+
+def open_account(balances, name, amount):
+    balances[name] = amount
+
+def sum_balances(accounts):
+    total = 0
+    for name, pence in accounts.items():
+        print(f"{name} had balance {pence}")
+        total += pence
+    return total
+
+def format_pence_as_string(total_pence):
+    if total_pence < 100:
+        return f"{total_pence}p"
+    pounds = int(total_pence / 100)
+    pence = total_pence % 100
+    return f"£{pounds}.{pence:02d}"
+# File "C:\Users\kkazi\Desktop\cyf\Module-Tools\prep\3.py", line 27, in format_pence_as_string
+   # return f"£{pounds}.{pence:02d}"
+                       #^^^^^^^^^^^
+#ValueError: Unknown format code 'd' for object of type 'float'
+balances = {
+    "Sima": 700,
+    "Linn": 545,
+    "Georg": 831,
+}
+
+open_account(balances, "Tobi", 913) # to solve the float int issue value passed in in pence3.py:35: error: Missing positional argument "amount" in call to "open_account"  [call-arg]
+open_account(balances, "Olya", 713) #3.py:36: error: Missing positional argument "amount" in call to "open_account"  [call-arg]
+
+total_pence = sum_balances(balances)
+total_string = format_pence_as_string(total_pence) # 3.py:39: error: Name "format_pence_as_str" is not defined  [name-defined]
+print(f"The bank accounts total {total_string}")

prep/3_mypy_error_and_is_adult.py

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+# Exercise
+# Add the is_adult code to the file you saved earlier.
+
+# Run it through mypy - notice that no errors are reported - mypy understands that Person has a property named age so is happy with the function.
+
+# Write a new function in the file that accepts a Person as a parameter and tries to access a property that doesn’t exist. 
+# Run it through mypy and check that it does report an error.
+
+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.age = age
+        self.preferred_operating_system = preferred_operating_system
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.name)
+print(imran.address)
+
+eliza = Person("Eliza", 34, "Arch Linux")
+print(eliza.name)
+print(eliza.address)
+
+def is_adult(person: Person) -> bool:
+    return person.age >= 18
+
+print(is_adult(imran))
+#error means prop does not exist
+
+def get_eye_colour(person: Person):
+    return person.eye_colour
+
+print(get_eye_colour(imran))
+#error in mypy no attribute

prep/4_Person_class_exercise.py

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+# exercise
+# Change the Person class to take a date of birth 
+# (using the standard library’s datetime.date class) and store it in a 
+# field instead of age.
+
+# Update the is_adult method to act the same as before.
+
+from datetime import date
+
+class Person:
+    def __init__(self, name: str, dob: date, preferred_operating_system: str):
+        self.name = name
+        self.dob = dob
+        self.preferred_operating_system = preferred_operating_system
+
+
+    def is_adult(self):
+        today = date.today()
+        age = date.today().year - self.dob.year
+        if (today.month, today.day) < (self.dob.month, self.dob.day):
+            age -= 1
+        return age >= 18
+
+imran = Person("Imran", date(1988, 10, 10), "Ubuntu")
+print(imran.is_adult())
+imran = Person("Jay", date(2015, 10, 10), "Ubuntu")
+print(imran.is_adult())

prep/4_advantages_of_methods.py

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+# exercise
+# Think of the advantages of using methods instead of free functions. Write them down in your notebook.
+1 makes data and logic more organised
+2 makes it easier to find and reuse code
+3 makes the code more specific and it is easier to understand what it is doing for 
+ a junior/learner like me :)
+4 reduces errors

prep/5_Person_dataclass_exercise.py

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+# ✍️exercise
+# Write a Person class using @datatype which uses a datetime.date 
+# for date of birth, rather than an int for age.
+
+# Re-add the is_adult method to it.
+
+from dataclasses import dataclass
+from datetime import date
+
+@dataclass
+class Person:
+    # def __init__(self, name: str, dob: date, preferred_operating_system: str):
+    #     self.name = name
+    #     self.dob = dob
+    #     self.preferred_operating_system = preferred_operating_system
+    name: str
+    dob: date
+    preferred_operating_system: str    
+
+    def is_adult(self):
+        today = date.today()
+        age = date.today().year - self.dob.year
+        if (today.month, today.day) < (self.dob.month, self.dob.day):
+            age -= 1
+        return age >= 18
+
+imran = Person("Imran", date(1988, 10, 10), "Ubuntu")
+print(imran.is_adult())
+imran = Person("Jay", date(2015, 10, 10), "Ubuntu")
+print(imran.is_adult())

prep/6_fix_code.py

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+# ✍️exercise
+# Fix the above code so that it works. You must not change the print 
+# on line 17 - we do want to print the children’s ages. 
+# (Feel free to invent the ages of Imran’s children.)
+
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    children: List["Person"]
+
+fatma = Person(name="Fatma", age=12, children=[])
+aisha = Person(name="Aisha", age=25, children=[])
+
+imran = Person(name="Imran", age=67, children=[fatma, aisha])
+
+def print_family_tree(person: Person) -> None:
+    print(person.name)
+    for child in person.children:
+        print(f"- {child.name} ({child.age})")
+
+print_family_tree(imran)

prep/7_type_values_fix.py

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+# ✍️exercise
+# Try changing the type annotation of Person.preferred_operating_system 
+# from str to List[str].
+
+# Run mypy on the code.
+
+# It tells us different places that our code is now wrong, because we’re 
+# passing values of the wrong 
+# type.
+
+# We probably also want to rename our field - lists are plural. Rename 
+# the field to preferred_operating_systems.
+
+# Run mypy again.
+
+# Fix all of the places that mypy tells you need changing. Make sure the 
+# program works as you’d expect.
+
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_systems: List[str]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: str
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+        if laptop.operating_system in person.preferred_operating_systems:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["Arch Linux"]),
+]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system="Arch Linux"),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="Ubuntu"),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="ubuntu"),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system="macOS"),
+]
+
+for person in people:
+    possible_laptops = find_possible_laptops(laptops, person)
+    print(f"Possible laptops for {person.name}: {possible_laptops}")
+

prep/8_laptop_program.py

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+# exercise
+# Write a program which:
+
+# Already has a list of Laptops that a library has to lend out.
+# Accepts user input to create a new Person - it should use the input 
+# function to read a person’s name, age, and preferred operating system.
+# Tells the user how many laptops the library has that have that 
+# operating system.
+# If there is an operating system that has more laptops available, 
+# tells the user that if they’re willing to accept that operating 
+# system they’re more likely to get a laptop.
+# You should convert the age and preferred operating system input from 
+# the user into more constrained types as quickly as possible, and 
+# should output errors to stderr and terminate 
+# the program with a non-zero exit code if the user input bad values.
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import List
+from collections import Counter
+import sys
+from typing import Tuple
+
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    ARCH = "Arch Linux"
+    UBUNTU = "Ubuntu"
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: OperatingSystem
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+def create_a_new_person() -> Person:
+    add_name = input("What is your name? \n")
+    if not add_name or add_name == "" or len(add_name) > 50:
+        print("Enter a valid name.", file=sys.stderr)
+        sys.exit(1)
+
+    str_add_age = input("What is your age? \n")
+    if not str_add_age.isdigit():
+        print("Enter a number.", file=sys.stderr)
+        sys.exit(1)
+    add_age = int(str_add_age)
+
+    if add_age <= 0 or add_age > 100:
+        print("Enter a valid age.", file=sys.stderr)
+        sys.exit(1)
+
+    add_os = input("What is your preferred operating system? \n")
+
+    if add_os not in [os.value for os in OperatingSystem]:
+        print("Enter a valid operating system.", file=sys.stderr)
+        sys.exit(1)
+
+    return Person(name=add_name, age=add_age, preferred_operating_system=OperatingSystem(add_os))
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> Tuple[List[Laptop], List[Laptop]]:
+    possible_laptops = []
+    other_laptops = []
+    for laptop in laptops:
+        if laptop.operating_system == person.preferred_operating_system:
+            possible_laptops.append(laptop)
+        else:
+            other_laptops.append(laptop)
+    return possible_laptops, other_laptops
+
+def compare_counts_of_poss_and_others(possible_laptops: List[Laptop], other_laptops: List[Laptop], person: Person) -> None:
+    if len(other_laptops) == 0:
+        print("The os you chose has the biggest availability.")
+        return
+    # counter to get obj
+    other_laptops_counted_as_obj = Counter(laptop.operating_system for laptop in other_laptops)
+    # and here turn to tuple os+count
+    most_common_laptop = other_laptops_counted_as_obj.most_common(1)[0]
+
+    if len(possible_laptops) < most_common_laptop[1]:
+        print(f"There are more laptops available with {most_common_laptop[0].value} than your preferred OS {person.preferred_operating_system.value}. Consider accepting that OS to increase your chances of getting a laptop.")
+    else:
+        print("Your chosen os has the biggest availability.")
+
+people = [
+    ]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system=OperatingSystem.MACOS),
+]
+
+for person in people:
+    possible_laptops, other_laptops = find_possible_laptops(laptops, person)
+    print(f"Possible laptops for {person.name}: {possible_laptops}")
+
+
+def execute():
+    new_person = create_a_new_person()
+    possible_laptops, other_laptops = find_possible_laptops(laptops, new_person)
+    print(f"Number of laptops matching your preferred OS: {len(possible_laptops)}")
+    compare_counts_of_poss_and_others(possible_laptops, other_laptops, new_person)
+
+
+execute()