我是列表理解的新手,想将下面的 for 循环代码复制到嵌套列表理解中。
master = []
inner = []
for x in range(1,8):
inner = []
for y in range(1,x+1):
inner.append(str(x*y).rjust(2))
master.append(inner)
for m in master:
print ' '.join(m)
输出看起来像这样:
1
2 4
3 6 9
4 8 12 16
5 10 15 20 25
6 12 18 24 30 36
7 14 21 28 35 42 49
我在想:
test = [
[str(x*y).rjust(2) for x in range(1,8)]
for y in range(1,x+1)
]
for t in test:
print ' '.join(t)
但是我得到一个回溯错误:
Traceback (most recent call last):
File "python", line 3, in <module>
NameError: name 'x' is not defined
任何 Python 专家愿意为我指出正确的方向吗?
提前致谢!
最佳答案
您可以使用以下嵌套列表理解:
answer = [[i*j for i in range(1, j+1)] for j in range(1, 8)]
print(answer)
输出
[[1],
[2, 4],
[3, 6, 9],
[4, 8, 12, 16],
[5, 10, 15, 20, 25],
[6, 12, 18, 24, 30, 36],
[7, 14, 21, 28, 35, 42, 49]]
关于Python Nested List Comprehensions 创建矩阵,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35799491/