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MySQLdb - Tuples

Hallo,
ich bin voll neu im Python-Programming, deshalb ist mein Problem
wahrscheinlich trivial:

Wenn ich die Script
############### ############### ###########33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.conn ect(host='local host', db='photum_0_6_ 2', user='root',
passwd='thkhgfg d')
c=db.cursor()
c.execute('sele ct person from persons order by person')
tup=c.fetchall( )
for a in tup:
print a
############### ############### ############### ###
ausführe, erhalte ich Dinge wie
('Dieter',)
('Hulda',)
.....

Ich brauche die Klammern, Apostrphe und Kommas nicht (ich will nur die
Inhalte) und kann ich sie nicht loswerden. Versucht habe ich u. a. print
a[2:-3] was nur zwei Klammern bringt.
b=lstrip(a, "(") haut auch nicht hin.
Weiss jemand Rat?

P.S. Woher kommen diese Klammern und Apostrophen, vom MySQLdb?
Jul 18 '05 #1
4 2423
Lajos Kuljo wrote:
Hallo,
ich bin voll neu im Python-Programming, deshalb ist mein Problem
wahrscheinlich trivial:

Wenn ich die Script
############### ############### ###########33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.conn ect(host='local host', db='photum_0_6_ 2', user='root',
passwd='thkhgfg d')
c=db.cursor()
c.execute('sele ct person from persons order by person')
tup=c.fetchall( )
for a in tup:
print a
############### ############### ############### ###
ausführe, erhalte ich Dinge wie
('Dieter',)
('Hulda',)
....

Ich brauche die Klammern, Apostrphe und Kommas nicht (ich will nur die
Inhalte) und kann ich sie nicht loswerden. Versucht habe ich u. a. print
a[2:-3] was nur zwei Klammern bringt.
b=lstrip(a, "(") haut auch nicht hin.
Weiss jemand Rat?
Hab gerade kein MySQL da, aber änder mal

for a in tup:
print a

in

for a in tup:
print a[0] # Das erste Element des Tupels
Dann wird statt des ganzen Tupels nur das erste Element ausgegeben.

P.S. Woher kommen diese Klammern und Apostrophen, vom MySQLdb?


Die Klammern und Apostrophe kommen daher, dass tup ein Tupel
(http://docs.python.org/lib/typesseq.html) mit einem Element
(der Person) ist.
Dennis
Jul 18 '05 #2
Dennis Benzinger wrote:
Lajos Kuljo wrote:
Hallo,
ich bin voll neu im Python-Programming, deshalb ist mein Problem
wahrscheinlic h trivial:

Wenn ich die Script
############# ############### #############33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.co nnect(host='loc alhost', db='photum_0_6_ 2', user='root',
passwd='thkhg fgd')
c=db.cursor ()
c.execute('se lect person from persons order by person')
tup=c.fetchal l()
for a in tup:
print a
############# ############### ############### #####
ausführe, erhalte ich Dinge wie
('Dieter',)
('Hulda',)
....

Ich brauche die Klammern, Apostrphe und Kommas nicht (ich will nur die
Inhalte) und kann ich sie nicht loswerden. Versucht habe ich u. a. print
a[2:-3] was nur zwei Klammern bringt.
b=lstrip(a, "(") haut auch nicht hin.
Weiss jemand Rat?

Hab gerade kein MySQL da, aber änder mal

for a in tup:
print a

in

for a in tup:
print a[0] # Das erste Element des Tupels
Dann wird statt des ganzen Tupels nur das erste Element ausgegeben.
P.S. Woher kommen diese Klammern und Apostrophen, vom MySQLdb?

Die Klammern und Apostrophe kommen daher, dass tup ein Tupel
(http://docs.python.org/lib/typesseq.html) mit einem Element
(der Person) ist.
Dennis

Thank you Dennis,
it works!
Sorry for the wrong language. I'm getting older.
Kind regards Lajos
Jul 18 '05 #3
############### ############### ###########33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.conn ect(host='local host', db='photum_0_6_ 2', user='root',
passwd='thkhgfg d')
c=db.cursor()
c.execute('sele ct person from persons order by person')
for (person,) in c: # or c.fetchall() (may be more portable)
print person
############### ############### ############### ###

If you return more than one column, then you don't need the parentheses
for the tuple unpacking. MySQLdb (and all other DB API databases)
return rows as tuples, so if you only select one column, you get a
tuple of one item.

(google groups eats leading spaces)

Jul 18 '05 #4
Andy Dustman wrote:
############### ############### ###########33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.conn ect(host='local host', db='photum_0_6_ 2', user='root',
passwd='thkhgfg d')
c=db.cursor()
c.execute('sele ct person from persons order by person')
for (person,) in c: # or c.fetchall() (may be more portable)
print person
############### ############### ############### ###

If you return more than one column, then you don't need the parentheses
for the tuple unpacking.


You don't need the parentheses for one element either:

for person, in c:
print person

works perfectly. Note the trailing comma.

Georg
Jul 18 '05 #5

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