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i just want to print the data in postgresql database into a dictionary. [closed]
Closed as unclear by Karl Knechtel on Apr 16, 2026 at 18:25
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I'm new to python. I just want to print the data in postgresql database into a dictionary.
The database consist of 3 column (name, department, overall_percentage) and I have 3 tables of class A, B, C.
Here what I need is to print the nested dictionary where the class a is key and inside nested dictionary the name as key and respective values in the row is value.
Here is my existing code:
import psycopg2
conn = psycopg2.connect(
database="CONNE py",
user='postgres',
password='asdf',
host='localhost',
port= '5432'
)
cursor=conn.cursor()
tables = ["Class_A", "Class_B", "Class_C"]
nested_dict={}
for table in tables:
cursor.execute(f"SELECT * FROM {table}")
inner_dict={'name':table[1],'department':[2], 'overall_percentage':[3]}
nested_dict[table[0]]=nested_dict.get(table[0],[])+[inner_dict]
print(f"{table}:",nested_dict)
cursor.close()
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