Interviewcake.com algorithmic pattern practice #1, my solution.

greedy.py

#Set the max profit to -infinity, because if the first possible trade is a loss (negative #) 
#we still want to keep track of it, and since we're checking if the potential profit is greater,
#-infinity is guaranteed to be smaller than any possible loss.
mp = float('-inf')

def get_max_profit(sp):
    for i, s in enumerate(sp):
        for j in range(i + 1, len(sp)):
            p = sp[j] - sp[i]
            if p > mp:
                mp = p
    return mp