如何使用python中的列表索引在for循环中进行字符串插值

Question

I have a list and I want to put its elements inside a for loop string like this:

my_list = ["Germany", "England", "Spain", "France"]
for this in that:
    do stuff
    print(my_list[0]+ some other stuff)

The output should be like:

Germany + some other stuff
England + some other stuff
Spain + some other stuff
France + some other stuff

How can I loop the indices for string interpolation as well?

Thanks!

Edit: The loop is a bit different. It's more like this:

for foo in bar:
    another_bar = []
    for x, y in foo:
        do stuff
        a = object.method()
        another_bar.append(my_list[0]+a)

I need to put the strings of lists into the 2nd layer of nested loop. Can't use zip here.

Answer 1

I believe you are assuming that that is the same lenght as my_list . If so, you can use zip to iterate over the two containers in parallel.

my_list = ["Germany", "England", "Spain", "France"]
my_other_list = [' is great at football', ' has good years in rugby', ' has Renaldo', ' is, well...']

def foo(bar):
    return bar + '!'

for country, bar in zip(my_list, my_other_list):
    other = foo(bar)
    print(country + other)

# Output:
# Germany is great at football!
# England has good years in rugby!
# Spain has Renaldo!
# France is, well...!

Answer 2

You can use the built-in function zip() . zip allows to process each list in parallel:

Make an iterator that aggregates elements from each of the iterables.

Returns an iterator of tuples, where the i -th tuple contains the i-th element from each of the argument sequences or iterables. The iterator stops when the shortest input iterable is exhausted. With a single iterable argument, it returns an iterator of 1-tuples. With no arguments, it returns an empty iterator.

my_list = ["Germany", "England", "Spain", "France"]
for country, this in zip(my_list, that):
    # do stuff
    print(country + that)

If your list are of different size, you can use itertoos.zip_longest :

Make an iterator that aggregates elements from each of the iterables. If the iterables are of uneven length, missing values are filled-in with fillvalue. Iteration continues until the longest iterable is exhausted.

from itertools import zip_longest

my_list = ["Germany", "England", "Spain", "France"]
for country, this in zip_longest(my_list, that):
    # do stuff
    print(country + that)

Answer 3

I hope this can help you.

for index, this in enumerate(that):
    do stuff
    print(my_list[index]+ some other stuff)