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 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:
^{pr2}$你能帮我找出我的代码出了什么问题吗? 提前谢谢!在
看起来像是打字错误:在SQL查询中,尝试使用
aadhaar_data
作为表名,而不是aadhar_data
。在相关问题 更多 >
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