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.connect(host='localhost', db='photum_0_6_2', user='root',
passwd='thkhgfgd')
c=db.cursor()
c.execute('select 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? 4 2410
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.connect(host='localhost', db='photum_0_6_2', user='root', passwd='thkhgfgd') c=db.cursor() c.execute('select 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
Dennis Benzinger wrote: 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.connect(host='localhost', db='photum_0_6_2', user='root', passwd='thkhgfgd') c=db.cursor() c.execute('select 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
Thank you Dennis,
it works!
Sorry for the wrong language. I'm getting older.
Kind regards Lajos
#########################################33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.connect(host='localhost', db='photum_0_6_2', user='root',
passwd='thkhgfgd')
c=db.cursor()
c.execute('select 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)
Andy Dustman wrote: #########################################33 #! /usr/bin/env python import MySQLdb db=MySQLdb.connect(host='localhost', db='photum_0_6_2', user='root', passwd='thkhgfgd') c=db.cursor() c.execute('select 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.
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