Skip to content

Update activity_2.py #14

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Update activity_2.py #14

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 10 additions & 6 deletions Week2_DataAccess/activity_2.py
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import sqlite3
import pandas as pd
from pandas.io import sql

import os

def read_csv(csv_file):
"""
Expand All @@ -22,14 +22,15 @@ def write_in_sqlite(dataframe, database_file, table_name):
sql.to_sql(dataframe, name=table_name, con=cnx)


def read_from_sqlite(database_file, table_name):
def read_from_sqlite(database_file, table_name, index_col=None):
"""
:param database_file: where the database is stored
:param table_name: the name of the table
:param index_col (optional): name of columns in db as index
:return: A Dataframe
"""
cnx = sqlite3.connect(database_file)
return sql.read_sql('select * from ' + table_name, cnx)
return sql.read_sql('select * from ' + table_name, cnx, index_col=index_col)


if __name__ == '__main__':
Expand All @@ -39,10 +40,13 @@ def read_from_sqlite(database_file, table_name):
loaded_df = read_csv(csv_file)

print("Creating database")
write_in_sqlite(loaded_df, database_file, table_name)

if os.path.exists(database_file):
print(database_file + "already exists.")
else:
write_in_sqlite(loaded_df, database_file, table_name)

print("Querying the database")
queried_df = read_from_sqlite(database_file, table_name)
queried_df = read_from_sqlite(database_file, table_name, index_col='index')

pd.set_option('display.width', 1000)
pd.options.display.max_colwidth = 3
Expand Down