One conditional can also be nested within another. (It is the same theme of composibility, again!) We could have written the previous example as follows:flowchart_nested_conditional.png

if x < y:
    STATEMENTS_A
else:
    if x > y:
        STATEMENTS_B
    else:
        STATEMENTS_C

Example:


Source: http://www.openbookproject.net/books/bpp4awd/ch04.html