How can you concatenate strings and numbers in python
vec1=["a","b","c"]
vec2=[1,2,3]
What I want is to combine the two vectors such that the following is the output:
vec3=["a1","b2","c3"]
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2 Answers
You can use a combination of zip and list comprehensions.
zip takes a list of iterables, and binds together every n-th element of each iterable into a new list. Here's how zip would handle vec1 and vec2:
>>> zip(vec1, vec2)
[('a', 1), ('b', 2), ('c', 3)]
So now you have a list of tuples, each containing a matched pair from both vec1 and vec2; all you need to do next is process your elements in order, and combine them into a single string. This can be concisely achieved with a list comprehension:
vec3 = [a+str(b) for a, b in zip(vec1, vec2)]
Comments
['{}{}'.format(*x) for x in zip(vec1, vec2)]
answered Nov 28, 2014 at 0:11
Ignacio Vazquez-Abrams
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