生成器表达式简介

Python 工具箱

Hugo Bowne-Anderson

Data Scientist at DataCamp

生成器表达式

[2 * num for num in range(10)]

[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

(2 * num for num in range(10))

<generator object <genexpr> at 0x1046bf888>

result = (num for num in range(6))

for num in result:
    print(num)

result = (num for num in range(6))

print(list(result))

[0, 1, 2, 3, 4, 5]

result = (num for num in range(6))

print(next(result))

print(next(result))

print(next(result))

print(next(result))

print(next(result))

even_nums = (num for num in range(10) if num % 2 == 0)

print(list(even_nums))

[0, 2, 4, 6, 8]

def num_sequence(n):
    """Generate values from 0 to n."""
    i = 0
    while i < n:
        yield i
        i += 1

result = num_sequence(5)

print(type(result))

<class 'generator'>

for item in result:
    print(item)

Python 工具箱