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i=n=input() while n+iwhile~-1n+i:i-=1;j=abs(i);print' '*j+'* '*(2*n+~j)
Prints a trailing space at the end of each line.
Thanks to Erik the Outgolfer for saving a byte.
i=n=input() while n+i-1:i-=1;j=abs(i);print' '*j+'* '*(2*n+~j)
i=n=input() while~-n+i:i-=1;j=abs(i);print' '*j+'* '*(2*n+~j)
