python-基礎語法-解析式

列表解析

[i for i in range(1, 11) ]
[i for i in range(1, 100) if i%2==0 if i!=50]
a = list()
for i in range(1, 100):
	if i % 2 == 0:
		if i != 50:
			a.append(i)
[expr for i in iterable1 for j in iterable2 ]
ret = list()
for i in range(1, 101):
	for j in range(2, 5):
		ret.append([i, j])
[(i,j) for i in range(7) if i>4 for j in range(20,25) if j>23]
[(i,j) for i in range(7) for j in range(20,25) if i>4 if j>23]
[(i,j) for i in range(7) for j in range(20,25) if i>4 and j>23]

生成器表達式
(返回值 for 元素 in 可迭代對象 if 條件)

g = ("{:04}".format(i) for i in range(1, 101))

集合解析式
{返回值 for 元素 in 可迭代對象 if 條件}

{[i] for i in range(1, 11)}
{(i, i+1) for i in range(1, 11)}

字典解析式
{返回值 for 元素 in 可迭代對象 if 條件}

{x:(x,x+1) for x in range(10)}
{x:[x,x+1] for x in range(10)}
{(x,):[x,x+1] for x in range(10)}
{[x]:[x,x+1] for x in range(10)} #
{chr(0x41+x):x**2 for x in range(10)}
{str(x):y for x in range(3) for y in range(4)}