Python Classroom notes 10/Mar/2026

Generator

• A generator in python is a function with yield statement
• Refer Here for docs on generator

Range function

• Refer Here for range function

for – loop

• for in python is for each in other languages Refer Here

list comprehensions

• Refer Here
• syntax

[ expression for item in list if condition == True]

Program to find even numbers between 100 and 1000

• Program – style

start = 100
end = 1000
even_numbers = []
for number in range(start, end+1):
    if number % 2 == 0:
        even_numbers.append(number)
print(even_numbers)

• list comprehension

[ number for number in range(start, end+1) if number%2 == 0]

Program to find prime numbers between a range

• We already have a function

def is_prime(number:int) -> bool:
    """Checks if the number is prime or not

    Args:
        number (int): number to be checked

    Returns:
        bool: Returns True if prime False otherwise
    """
    is_prime_result = True
    if number < 2:
        is_prime_result = False
    else:
        index = 2
        while index < number:
            if number % index == 0:
                is_prime_result = False
                break
            index += 1
    return is_prime_result

• Find prime numbers between a range

start = 100
end = 1000
prime_numbers = []
for number in range(start, end+1):
    if is_prime(number):
        prime_numbers.append(number)
print(prime_numbers)

• list comprehensions

[ number for number in range(start, end+1) if is_prime(number) ]

Iterables and its functions

| Function | Purpose | Example |
| ————- | ————————— | —————————— |
| iter() | Convert iterable → iterator | iter([1,2,3]) |
| next() | Get next item from iterator | next(it) |
| len() | Number of elements | len([1,2,3]) |
| sum() | Sum elements | sum([1,2,3]) |
| min() | Smallest element | min([3,1,2]) |
| max() | Largest element | max([3,1,2]) |
| sorted() | Returns sorted list | sorted([3,1,2]) |
| reversed() | Reverse iterable | reversed([1,2,3]) |
| enumerate() | Add index while iterating | enumerate(['a','b']) |
| zip() | Combine multiple iterables | zip(a,b) |
| map() | Apply function to iterable | map(str,[1,2]) |
| filter() | Filter elements | filter(lambda x:x>2,[1,3,5]) |
| any() | True if any element is True | any([0,1,0]) |
| all() | True if all elements True | all([1,2,3]) |