python store string to array not characters

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Difference between append vs. extend list methods in Python 22 answers

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a.extend(b) is for extending list a by concatenating another sequence b onto it. When b is a string, and you force it to be interpreted as a sequence, it is interpreted as a sequence of individual characters. A simple example of this is:

>>> b = 'Hello'
>>> list(b)
['H', 'e', 'l', 'l', 'o']

Instead, you clearly want to do a.append(b) , ie insert the entire string b as a single new item at the end of a .

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