import bug

Author: emmanuelle

python/3d-surface-plots.md

@@ -60,6 +60,7 @@ If you do not specify `x` and `y` coordinates, integer indices are used for the
 import plotly.graph_objects as go
 
 import pandas as pd
+import numpy as np
 
 # Read data from a csv
 z_data = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/api_docs/mt_bruno_elevation.csv')