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import pandas as pd
data = {
  "Duration": [50, 40, 45],
  "Pulse": [109, 117, 110],
  "Calories": [409.1, 479.5, 340.8]  
}
df = pd.DataFrame(data)
print(df.corr())
            Duration     Pulse  Calories
  Duration  1.000000 -0.917663 -0.507551
  Pulse    -0.917663  1.000000  0.808134
  Calories -0.507551  0.808134  1.000000