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new column in pandas with where logic

virtsizes = {
  "type1": { "gb": 1.2, "xxx": 0, "yyy": 30 },
  "type2": { "gb": 1.5, "xxx": 2, "yyy": 20  },
  "type3": { "gb": 2.3, "xxx": 0.1, "yyy": 10  },
}
d = {k:v['gb'] for k,v in virtsizes.items()}
print (d)
{'type2': 1.5, 'type1': 1.2, 'type3': 2.3}

df = pd.DataFrame({'vol-type':['type1','type2']})
df["real_size"] = df["vol-type"].map(d)
print (df)
  vol-type  real_size
0    type1        1.2
1    type2        1.5

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new column in pandas with where logic

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