Append a new row 'k' to df (values ['dog', 5.5, 2, 'no']), then delete it
to recover the original DataFrame. Return the result.
Input
animal age visits priority
a cat 2.5 1 yes
b cat 3.0 3 yes
c snake 0.5 2 no
d dog NaN 3 yes
e dog 5.0 2 no
f cat 2.0 3 no
g snake 4.5 1 no
h cat NaN 1 yes
i dog 7.0 2 no
j dog 3.0 1 no
Output
animal age visits priority
a cat 2.5 1 yes
b cat 3.0 3 yes
c snake 0.5 2 no
d dog NaN 3 yes
e dog 5.0 2 no
f cat 2.0 3 no
g snake 4.5 1 no
h cat NaN 1 yes
i dog 7.0 2 no
j dog 3.0 1 no
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