Python Generator生成器函数基本概念及高级用途技巧示例

def fibonacci_generator(n):
    a, b = 0, 1
    count = 0
    while count < n:
        yield a
        a, b = b, a + b
        count += 1

def lazy_evaluation():
    for i in range(10):
        yield i * 2
# 只有在迭代时才会计算值
for value in lazy_evaluation():
    print(value)

def infinite_sequence():
    i = 1
    while True:
        yield i
        i += 1

def read_data(filename):
    with open(filename, 'r') as file:
        for line in file:
            yield line
def filter_lines(lines, keyword):
    for line in lines:
        if keyword in line:
            yield line
def count_lines(lines):
    count = 0
    for line in lines:
        count += 1
    yield count
# 创建一个数据处理管道
lines = read_data('data.txt')
filtered = filter_lines(lines, 'keyword')
line_count = count_lines(filtered)
# 获取结果
for count in line_count:
    print(f"Total lines: {count}")

def interactive_generator():
    while True:
        received = yield
        if received == "exit":
            break
        yield f"Received: {received}"
gen = interactive_generator()
next(gen)  # 启动生成器
gen.send("Hello")
response = next(gen)
print(response)
gen.send("How are you?")
response = next(gen)
print(response)
gen.send("exit")

numbers = [1, 2, 3, 4, 5]
gen = (x * 2 for x in numbers)
for value in gen:
    print(value)

def generator_a():
    yield 1
    yield 2
def generator_b():
    yield 'a'
    yield 'b'
def combined_generator():
    gen_a = generator_a()
    for value in gen_a:
        yield value
    gen_b = generator_b()
    for value in gen_b:
        yield value
gen = combined_generator()
for value in gen:
    print(value)