Wprowadzenie do manipulowania danymi

Czym jest manipulowanie danymi?

Sortowanie list

# Creates a list of numbers
numbers = [4, 2, 9, 1, 5]

# Sorts the list in ascending order
numbers.sort()

# Prints the sorted list
print(numbers)  # Output: [1, 2, 4, 5, 9]

Wycinanie fragmentów list i krotek

# Creates a list of fruits
fruits = ["apple", "banana", "cherry", "date", "elderberry"]

# Slices the list from index 1 to 3 (excluding 4)
subset = fruits[1:4]

# Prints the sliced list
print(subset)  # Output: ['banana', 'cherry', 'date']

Iterowanie po strukturach danych

# Creates a list of colors
colors = ["red", "green", "blue"]

# Iterates through the list and prints each color
for color in colors:
    print(color)

Składanie list

# Creates a list of squares from 1 to 5 using list comprehension
squares = [x**2 for x in range(1, 6)]

# Prints the list of squares
print(squares)  # Output: [1, 4, 9, 16, 25]

Sortowanie z użyciem kluczy

# Creates a list of tuples with names and ages
people = [("Alice", 30), ("Bob", 25), ("Charlie", 35)]

# Sorts the list by age using a key
people.sort(key=lambda person: person[1])

# Prints the sorted list
print(people)  # Output: [('Bob', 25), ('Alice', 30), ('Charlie', 35)]

Przykładowy program: oceny uczniów

# Creates a list of student grades as tuples
student_grades = [
    ("Alice", 88),
    ("Bob", 92),
    ("Charlie", 78),
    ("Diana", 85),
    ("Ethan", 95)
]

# Sorts the list by grade in descending order
student_grades.sort(key=lambda student: student[1], reverse=True)

# Slices the top 3 students
top_students = student_grades[:3]

# Prints the top students
print("Top Students:")
for student in top_students:
    print(student[0] + " scored " + str(student[1]))
    
# Output:
# Top Students:
# Ethan scored 95
# Bob scored 92
# Alice scored 88

# Creates a list of numbers
numbers = [10, 5, 8, 3, 7]

# Sorts the list in ascending order
numbers.sort()

# Slices the first three numbers
top_three = numbers[:3]

# Prints the sliced list
print(top_three)

Świetna robota!