out = 'Hello'
print( out.join([' world']) )
When I run it, it shows
world
Isn't it supposed to print hello world?
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3 Answers
No, it joins the elements of the list with the word 'Hello'. For example, if you had ['A', 'B'], it would produce 'AHelloB'. Since there is only one element in your list, there is nothing to join, so it can just return the only element in there unchanged.
What you wanted is probably something like ' '.join(['Hello', 'world']).
Comments
join() behaves slightly differently to how you expect. It takes a list of words to join. The seed word is what you put between the joins.
' '.join(['Hello', 'world'])
>> Hello world
','.join(['Hello', 'world'])
>> Hello,world
'/'.join(['name', 'location', 'age'])
>> name/location/age
'*'.join(['name'])
>> name
'hello'.join(['world'])
>> world
