import time

def my_generator():
    yield 3
    yield 2
    yield 1 
    
for value in my_generator():
    print(value)    
    

# Using next() to manually iterate through the generator  
g = my_generator()
print(next(g))  # Output: 1
print(next(g))  # Output: 2
print(next(g))  # Output: 3 

print(sum(my_generator()))  # Output: 6
print(sorted(my_generator()))  # Output: [1, 2, 3]

def countdown(n):
    while n > 0:
        yield n
        n -= 1      
        
for number in countdown(4):
    print(number) 
    time.sleep(1)  # Pause for 1 second between numbers

# Example of a generator function to yield first n numbers    
def firstn(n):
    num = 0
    while num < n:
        yield num
        num += 1
 
# calling firstn():       
for number in firstn(10):
    print(number)   


print(sum(firstn(100)))  # Output: 4950

    
# Example of a generator expression
squared = (x * x for x in range(10))    
for num in squared:
    print(num)

# Fibonacci sequence generator
def fibonacci(n):
    a, b = 0, 1
    for _ in range(n):
        yield a
        a, b = b, a + b

for num in fibonacci(30):
    print(num)
    
print(list(fibonacci(30)))  # Output: [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]