Question

How can I pull data in mySQL by day using python date?
Say I want day1 and day2 ( or a day after day1 ) iterate for n times

So I need the date in “where” SQL statement to look like below list in each iteration (n times )

day1 >= '2012-01-01'  and  day2 < '2012-01-02'    ( n = 1 )
day1 >= '2012-01-02'  and  day2 < '2012-01-03'    ( n = 2 )
.
.
day1 >= yesterday    and day2  < today            ( n times ) 

.

Start_date = '2012-01-01'   <- How can I write this in python
End_date = Today()   <- and this 

So as to write:

for each iteration ..
    con.execute("select * from table where date >= day1 and date < day2" )

Answer 1

You need to datetime module:-

import datetime
start = datetime.date(2012,01,01) 
next = start + datetime.date.resolution

while next <= datetime.date.today():
    print start, next

    con.execute("""
        select * from table where date >= %s and date < %s
    """, (start, next))

    start = next
    next = start + datetime.date.resolution

IMPORTANT NOTICE: I updated the answer to fix a serious problem. Never ever use string formatting (a.k.a. %) for building SQL queries since it is open to serious problems including SQL injection. Use Python-<db_driver> api where nearly all RDMBes offers the same syntax

execute("select * from blah where x=%s AND y=%s", (x, y))
                                     ^       ^  ^
                                     1       1  2

1] No quote,
2] No string formatting