CODEWITHSUNDEEP
pythonlistjoin
user1998511
user1998511

Reputation: 465

Python Join multiple lists into a string with %

I have two lists of strings that I want to join into string. Basically if I have two lists:

name = ['Name1', 'Name2', 'Name3']

link = ['Link1', 'Link2', 'Link3']

and I want to insert them into a string, such as one below:

<a href="%s">%s

Is this possible to do using join or do I need to use a for loop?

Upvotes: 0

Views: 958

Answers (2)

theodox
theodox

Reputation: 12218

@Ignacio's answer is a great one for this application.

Depending on the intended use, you might instead need to create one string with the right number of placeholders. 

from itertools import chain, izip
name = ['Name1', 'Name2', 'Name3']    
link = ['Link1', 'Link2', 'Link3']

args = [i for i in chain.from_iterable(izip(name, link))]
placeholder = ''.join(["<a href=%s>%s"] * len (name))
# combined to make '<a href=%s>%s<a href=%s>%s<a href=%s>%s'
print placeholder % tuple(args)

The two useful tricks (a) to use list multiplication to duplicate the placeholder string as needed and (b) remember that % requires a tuple argument. This is a common pattern when expanding lists of placeholders

Upvotes: 0

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 799044

['<a href="%s">%s' % (n, l) for (n, l) in zip(name, link)]

But don't forget to encode n and l appropriately in order to prevent security issues.

Upvotes: 3

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