[英]How to print nested lists using nested loops?
Hi i have a simplified example of my problem. 嗨,我有我的问题的简化示例。
i would like to get an output of 我想得到一个输出
1
a
b
2
c
3
d
e
f
4
g
5
h
I have tried different variations but can figure out the logic. 我尝试了不同的变体,但可以弄清楚逻辑。 My code is below. 我的代码如下。 Thanks for your help in advance. 感谢您的帮助。 I am trying to do it without using numpy or panda. 我正在尝试不使用numpy或panda。 I am using python3.4 我正在使用python3.4
num = ["1" , "2" ,"3" , "4" , "5" ]
let = [["a","b"],["c"],["d","e","f"],["g"],["h"]]
for x in num :
print(x)
for y in let :
print(y)
zipBoth = zip(num,let)
for x,y in zipBoth :
print(x)
print(y)
Note that you are trying to print the contents of two lists. 请注意,您正在尝试打印两个列表的内容。 This is a linear operation in time. 这是时间上的线性运算。 Two loops just won't cut it - that's quadratic in time complexity. 两个循环不会消除它-时间复杂度是二次方。 Furthermore, your second solution doesn't flatten y
. 此外,第二个解决方案不会使y
变平。
Define a helper function using yield
and yield from
. 使用yield
和yield from
定义一个辅助函数。
def foo(l1, l2):
for x, y in zip(l1, l2):
yield x
yield from y
for i in foo(num, let):
print(i)
1
a
b
2
c
3
d
e
f
4
g
5
h
If you want a list instead, just call foo
with a list
wrapper around it: 如果您想要一个列表,只需调用foo
及其周围的list
包装即可:
print(list(foo(num, let)))
['1', 'a', 'b', '2', 'c', '3', 'd', 'e', 'f', '4', 'g', '5', 'h']
Note that yield from
becomes available to use from python3.3 onwards. 请注意, yield from
从python3.3起可以使用。
just zip
the lists and flatten twice applying itertools.chain
只需zip
列表并使用itertools.chain
展平两次
num = ["1" , "2" ,"3" , "4" , "5" ]
let = [["a","b"],["c"],["d","e","f"],["g"],["h"]]
import itertools
result = list(itertools.chain.from_iterable(itertools.chain.from_iterable(zip(num,let))))
now result
yields: 现在result
产量:
['1', 'a', 'b', '2', 'c', '3', 'd', 'e', 'f', '4', 'g', '5', 'h']
which you can print with: 您可以使用以下命令进行打印:
print(*result,sep="\n")
numlet = [c for n, l in zip(num,let) for c in [n] + l]
for c in numlet:
print(c)
Flatten the list let
using pydash
. 拼合名单let
使用pydash
。 pydash is a utility library. pydash是一个实用程序库。
Print each element from the concatenated list ( num + pydash.flatten(let)
) 打印串联列表中的每个元素( num + pydash.flatten(let)
)
>>> import pydash as pyd
>>> num = ["1" , "2" ,"3" , "4" , "5" ]
>>> let = [["a","b"],["c"],["d","e","f"],["g"],["h"]]
>>> for i in [str(j) for j in num + pyd.flatten(let)]:
... print(i)
1
2
3
4
5
a
b
c
d
e
f
g
h
>>>
this solution assumes that "num" and "let" have the same number of elements 此解决方案假定“ num”和“ let”具有相同数量的元素
num = ["1" , "2" ,"3" , "4" , "5" ]
let = [["a","b"],["c"],["d","e","f"],["g"],["h"]]
for i in range(len(num)):
print num[i]
print '\n'.join(let[i])
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