Python：访问列表组合中的列表元素

Question

I am new to python and I have spent hours trying to figure out the following problem. I have an object that looks like this

>> new_list=['abscd','qrtye']['fghtj', 'wert']...more lists
>> type(new_list)

<type 'list'>
<type 'list'>
...

I would like to access each string within each list. I tried a for-loop and to use .split() as in:

>> for l in new_list:
>>     l.split() 

but I can't access the two strings separately within list l. Any help will be appreciated.Thanks!

Answer 1

I'm guessing you have an iterable which yields 2-element lists when iterating. If so, you can unpack those 2-element lists in your for loop:

>>> data = ["foo","bar"],["baz","qux"]
>>> for s1,s2 in data:
...     print s1, "Hello", s2
... 
foo Hello bar
baz Hello qux

Answer 2

You have to put your lists into a 'parent' list, and there you go, it's something like:

new_list = [['abscd', 'qrtye'], ['fghtj', 'wert']]
for sub_list in new_list:
    for string in sub_list:
        # do something with string

Or with generator expressions:

for string in (string for sub_list in new_list for string in sub_list):
    # do something with string