Pandas: Check If Column Value Is Smaller Than Any Previous Column Value

I want to check if any value of column 'c' is smaller than all previous column values. In my current approach I am using pandas diff(), but it let's me only compare to the previous

Solution 1:

This should work:

df['diff'] = df['c'] < df['c'].cummax()

Output is just as you mentioned:

    c   diff
01False14False29False37True48True536False