python - Subtraction/Addition from seperate rows/columns -

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i have dataframe this:

day    diff 137    0 185    48 249    64 139   -110

in column diff whenever negative value encountered want subtract 365 value in day previous row , add value day value in current row of negative number. example, in scenario when -110 encountered want 365-249 (249 day in previous row) , add 139. 365-249 = 116 , 116 + 139 = 255. therefore -110 replaced 255.

my desired output is:

day    diff 137    0 185    48 249    64 139    255

you can way:

in [32]: df.loc[df.diff < 0, 'diff'] = 365 + df.day - df.shift().loc[df.diff < 0, 'day']  in [33]: df out[33]:    day   diff 0  137    0.0 1  185   48.0 2  249   64.0 3  139  255.0

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