import pandas as pd
 
pets = [{'species': 'cat', 'name': 'Murka', 'age': 3}, 
		{'species': 'dog', 'name': 'Barbos', 'weight': 10}, 
		{'species': 'cat', 'weight': 6}]
 
df = pd.io.json.json_normalize(pets)
 
print (df)
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