Append string into a list

Question

I would like to loop through a list in python and usually I do in this way:

let's imagine a list into a variable called 'movie' where I want to print the even into a variable 'authors' and the odd into 'stars'. I would do like this:

stars = movies[0] #print the first
authors = movies[1] #print the second

for i in range(0, len(movies), 2):
    stars = movies[0+i]
    authors = movies[1+i]

But how can i do in this other way?

stars, authors = movies[0:2]

for i in range(0, len(movies), 2):
    stars #how can i insert "i"?

Sheldon · Accepted Answer · 2019-08-22 18:03:21Z

2

You can use slicing:

stars=movies[::2]
authors=movies[1::2]

stars consists of every other sample in the movies array, hence the step of 2. It starts with the 0th index, which was omitted above. You could also write stars=movies[0::2].

authors also uses a step of 2, but starts with the first index in movies.

You can check out the basics of indexing and slicing here.

edited Aug 22, 2019 at 18:03

answered Aug 22, 2019 at 17:58

Sheldon

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wilkben · Accepted Answer · 2019-08-22 17:56:19Z

0

Assuming you don't need the value of movies afterwards you can use extended iterable unpacking

while movies:
    stars, authors, *movies = movies

answered Aug 22, 2019 at 17:56

wilkben

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Djaouad · Accepted Answer · 2019-08-22 17:57:16Z

0

Just use triple slicing (start:end:step):

stars, authors = movies[::2], movies[1::2]

answered Aug 22, 2019 at 17:57

Djaouad

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Waket Zheng · Accepted Answer · 2019-08-22 18:00:40Z

0

for i in range(0, len(movies), 2):
    stars, authors = movies[i:i+2]

answered Aug 22, 2019 at 18:00

Waket Zheng

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