Python 对数据帧执行SQL命令时出错
我正在学习Udacity数据科学课程,我的解决方案正是他们提供的Python 对数据帧执行SQL命令时出错,python,pandas,sqlite,pandasql,Python,Pandas,Sqlite,Pandasql,我正在学习Udacity数据科学课程,我的解决方案正是他们提供的 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 cha
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")
但是,它会返回以下错误:
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']
文件“pandas_sql.py”,第29行,在
打印选择“首先”50(“/home/trina/Documents/Udacity\u datascience/aadhaar\u data.csv”)
文件“pandas\u sql.py”,第26行,在select\u first\u 50中
aadhaar_solution=pandasql.sqldf(q.lower(),locals())
sqldf中的第156行文件“/home/trina/anaconda2/lib/python2.7/site packages/pandasql/sqldf.py”
返回PandaSQL(db_uri)(查询,环境)
文件“/home/trina/anaconda2/lib/python2.7/site packages/pandasql/sqldf.py”,第63行,在调用__
引发PandaSQLException(ex)
pandasql.sqldf.PandaSQLException:(sqlite3.OperationalError)没有这样的表:aadhar_数据[SQL:'\n\t从aadhar_数据限制50中选择注册机构、注册机构;\n\t']
你能帮我找出我的代码出了什么问题吗?
提前谢谢 看起来就像输入错误:在SQL查询中,尝试使用
aadhar\u数据
作为表名,而不是aadhar\u数据
q = """
SELECT registrar, enrolment_agency FROM aadhaar_data LIMIT 50;
"""