[Python] Find points in curve

Can you share some ideas of how to find curve points (orange color marked places) like shown in picture:

I've tried this code:

result = []
for i in range(len(df)):
if i == 0 or df['y'].iloc != df['y'].iloc[i - 1]:
result.append(df.iloc)
continue
if i < len(df) - 1 and df['y'].iloc != df['y'].iloc[i + 1]:
result.append(df.iloc)


but the problem is, my 'y' isn't always equal between breakpoints and returns too many values. Could you give some advice, how to achieve my goal?

Used data for picture:

time = np.arange(0, 2200, 100)
values = np.array([-0.1, 0, 0.13, 0.27, 0.27, 0.4, 0.27, 0.27, 0.13, 0.13,
0.01, 0.01, -0.13, -0.13, -0.27, -0.4, -0.4, -0.27, -0.13, -0.13, 0, 0])

full_time = np.arange(0, 2200, 1)
full_values = np.interp(full_time, time, values)

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