Fehler beim Ausführen von SQL-Befehl gegen Pandas Dataframe

Question

Ich verfolge die Udacity Daten Wissenschaft in Kurs und meine Lösung war genau der, den sie zur Verfügung gestellt

import pandas 
import pandasql 

def select_first_50(filename): 
    # Read in our aadhaar_data csv to a pandas dataframe. Afterwards, we rename the columns 
    # by replacing spaces with underscores and setting all characters to lowercase, so the 
    # column names more closely resemble columns names one might find in a table. 
    aadhaar_data = pandas.read_csv(filename) 
    aadhaar_data.rename(columns = lambda x: x.replace(' ', '_').lower(), inplace=True) 

    # Select out the first 50 values for "registrar" and "enrolment_agency" 
    # in the aadhaar_data table using SQL syntax. 
    # 
    # Note that "enrolment_agency" is spelled with one l. Also, the order 
    # of the select does matter. Make sure you select registrar then enrolment agency 
    # in your query. 
    # 
    # You can download a copy of the aadhaar data that we are passing 
    # into this exercise below: 
    # https://s3.amazonaws.com/content.udacity-data.com/courses/ud359/aadhaar_data.csv 
    q = """ 
    SELECT registrar, enrolment_agency FROM aadhar_data LIMIT 50; 
    """ 

    #Execute your SQL command against the pandas frame 
    aadhaar_solution = pandasql.sqldf(q.lower(), locals()) 
    return aadhaar_solution 

print select_first_50("/home/trina/Documents/Udacity_datascience/aadhaar_data.csv") 

aber es mir diese Fehlermeldung zurückgibt:

File "pandas_sql.py", line 29, in <module> 
    print select_first_50("/home/trina/Documents/Udacity_datascience/aadhaar_data.csv") 
    File "pandas_sql.py", line 26, in select_first_50 
    aadhaar_solution = pandasql.sqldf(q.lower(), locals()) 
    File "/home/trina/anaconda2/lib/python2.7/site-packages/pandasql/sqldf.py", line 156, in sqldf 
    return PandaSQL(db_uri)(query, env) 
    File "/home/trina/anaconda2/lib/python2.7/site-packages/pandasql/sqldf.py", line 63, in __call__ 
    raise PandaSQLException(ex) 
pandasql.sqldf.PandaSQLException: (sqlite3.OperationalError) no such table: aadhar_data [SQL: '\n\tselect registrar, enrolment_agency from aadhar_data limit 50;\n\t'] 

Can hilfst du mir bitte herauszufinden, was in meinem Code falsch läuft? danke im voraus!

Answer 1

Sieht aus wie nur Tippfehler: in SQL-Abfrage versuchen aadhaar_data als Tabellennamen zu verwenden, statt aadhar_data.

q = """ 
SELECT registrar, enrolment_agency FROM aadhaar_data LIMIT 50; 
"""