Does any pair sum to 10?

Write a Python function that checks whether any two numbers in a list add up to 10.

[2, 5, 6, 4, 7, 3, 8, 9, 1]

True False

Approach

1. Keep a set of numbers seen; for each number check whether 10 - n was seen.

Solution

def has_pair(numbers, target=10):    seen = set()    for n in numbers:        if target - n in seen:            return True        seen.add(n)    return False print(has_pair([2, 5, 6, 4, 7, 3, 8, 9, 1]), has_pair([1, 2, 3]))

True False

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Fibonacci terms up to n terms

Write a Python function that returns the first n Fibonacci numbers starting 1, 1.

9

1 1 2 3 5 8 13 21 34

Approach

1. Build a list in a loop.

Solution

def fibonacci(n):    series = []    a, b = 1, 1    for _ in range(n):        series.append(a)        a, b = b, a + b    return series print(*fibonacci(9))

1 1 2 3 5 8 13 21 34

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Factorial function (recursive)

Write a Python function to get the factorial of a number.

5

120

Approach

1. n! = n × (n − 1)!, with 0! = 1.

Solution

def factorial(n):    if n <= 1:        return 1    return n * factorial(n - 1) print(factorial(5))

120

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Function with *args

Write a Python function that accepts any number of numbers with *args and prints their cubes.

5, 6, 8, 7

tuple (5, 6, 8, 7)
125 216 512 343

Approach

1. *args collects the values into a tuple.

Solution

def cubes(*args):    print(type(args).__name__, args)    print(*(n ** 3 for n in args)) cubes(5, 6, 8, 7)

tuple (5, 6, 8, 7)
125 216 512 343

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HCF function

Write a Python function to find the HCF of two numbers.

24, 54

6

Approach

1. Euclid’s algorithm.

Solution

def hcf(a, b):    while b:        a, b = b, a % b    return a print(hcf(24, 54))

6

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Sum from 0 to n

Write a Python function to calculate the sum of numbers from 0 to 10.

55

Approach

1. sum(range(n + 1)).

Solution

def sum_to(n=10):    return sum(range(n + 1)) print(sum_to())

55

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LCM function

Write a Python function to find the LCM of two numbers.

12, 20

60

Approach

1. LCM = a × b // HCF.

Solution

def hcf(a, b):    while b:        a, b = b, a % b    return a def lcm(a, b):    return a * b // hcf(a, b) print(lcm(12, 20))

60

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Function inside a function

Write a Python program that defines and uses a function inside another function.

Hello, Asha!

Approach

1. The inner function is only visible inside the outer one; it can read the outer variables.

Solution

def greet(name):    def make_message():        return f"Hello, {name}!"    return make_message() print(greet("Asha"))

Hello, Asha!

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Run Python code stored in a string

Write a Python function that executes Python code stored in a string.

inside exec: 81
81

Approach

1. exec() runs code; give it a separate namespace dictionary so it cannot touch your variables.

Solution

def run_code(source):    namespace = {}    exec(source, namespace)    return {k: v for k, v in namespace.items() if not k.startswith("__")} code = """def square(x):    return x * xresult = square(9)print("inside exec:", result)"""print(run_code(code)["result"])

inside exec: 81
81

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Squares of 1 to 10

Write a Python function that creates and prints a list of the squares of 1 to 10.

[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

Approach

1. Build the list, print it and return it.

Solution

def squares(n=10):    result = [i * i for i in range(1, n + 1)]    print(result)    return result squares()

[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

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