I am new to python and i am facing problem in creating the Dataframe in the format of key and value i.e.
data = [{'key':'\[GlobalProgramSizeInThousands\]','value':'1000'},]
Here is my My code
columnsss = ['key','value'];
query = "select * from bparst_tags where tag_type = 1 ";
result = database.cursor(db.cursors.DictCursor);
result.execute(query);
result_set = result.fetchall();
data = "[";
for row in result_set:
`row["tag_expression"]`)
data += "{'value': %s , 'key': %s }," % ( `row["tag_expression"]`, `row["tag_name"]` )
data += "]" ;
df = DataFrame(data , columns=columnsss);
But when i pass the data in DataFrame it shows me pandas.core.common.PandasError: DataFrame constructor not properly called!.
while if i print the data and assign the same value to data variable then it works.
You are providing a string representation of a dict to the DataFrame constructor, and not a dict itself. So this is the reason you get that error.
So if you want to use your code, you could do:
df = DataFrame(eval(data))
But better would be to not create the string in the first place, but directly putting it in a dict. Something roughly like:
data = []
for row in result_set:
data.append({'value': row["tag_expression"], 'key': row["tag_name"]})
But probably even this is not needed, as depending on what is exactly in your result_set you could probably:
DataFrame(result_set)read_sql_query function to do this for you (see docs on this)Source: Stackoverflow.com