Struggling to convert a mysql datetime object to a python string of adifferent format

[Íßêïò]

Okey, i have many hours now struggling to convert a mysql datetime
field that i retreive to a string of this format '%d %b, %H:%M'

I google a lot but couldnt found out how to format it being a string

Here si the code so far:

try:
cursor.execute( ''' SELECT host, hits, date FROM visitors WHERE page
= '%s' ORDER BY date DESC ''' % (page) )
except MySQLdb.Error:
print( "Error %d: %s" % (e.args[0], e.args[1]) )
else:
#display results
print ( '''<center><br><h3> ( ÅðéóêÝðôçò ) ----- ( ÅðéóêÝøåéò )
----- ( Çìåñïìçíßá ) </h3><br>''' )
print ( '''<table border = "5" cellpadding = "5">''' )

results = cursor.fetchall()

for row in results:
print ( ''' <tr> ''' )

for entry in row:
entry = datetime.datetime.strftime( entry, '%d %b, %H:%M' ) #!!!
this is wrong!
print ( ''' <td> %s </td> ''' % entry )

sys.exit(0)

Apart from that i don't know how iam supposed to print it, because the
date string is the 3rd string in every row of the dataset.

Please help me out!

 

[Dennis Lee Bieber]

for entry in row:
entry = datetime.datetime.strftime( entry, '%d %b, %H:%M' ) #!!!
this is wrong!
print ( ''' <td> %s </td> ''' % entry )

Apart from that i don't know how iam supposed to print it, because the
date string is the 3rd string in every row of the dataset.

As you state, it is the third item in each returned row... So why
are you trying to treat EVERY item in the row as a date?

Since MySQLdb appears to return datetime objects (my quick test is
showing datetime.date for dates in a test database) you should be
probably be using

formatted_entry = entry.strftime("%d... %M")

to do the formatting as string

 

[Îίκος]

        As you state, it is the third item in each returned row... So why
are you trying to treat EVERY item in the row as a date?

Because when i try to prin the 3 items liek that

print row[0], row[1], row[2]

it gives me an error, so i dont knwo how to tell it how to print the
3rd item differently.

        Since MySQLdb appears to return datetime objects (my quick test is
showing datetime.date for dates in a test database) you should be
probably be using

        formatted_entry = entry.strftime("%d... %M")

I tried that myself yesterday but look it fails to the following
message

/home/webville/public_html/cgi-bin/index.py
63
64 for entry in row:
65 formatted_entry =
entry.strftime('%d %b, %H:%M')
66 print ( ''' <td> %s </td> ''' %
entry )
67
formatted_entry undefined, entry = '178-124-186.dynamic.cyta.gr',
entry.strftime undefined
AttributeError: 'str' object has no attribute 'strftime'
args = ("'str' object has no attribute 'strftime'",)

 

[Íßêïò]

Hey i made it!

dataset = cursor.fetchall()

for row in dataset:
print ( ''' <tr> ''' )

date = row[2].strftime( '%d %b, %H:%M' )

print ( ''' <td> %s </td> <td> %s </td> <td> %s </td> ''' %
( row[0], row[1], date ) )

Unfortunately had to ditch the 'for entry in row' line because
couldn't iterate over the items of the row.

Could you please shoe me how could i do the same thing with
iteration?!
Thanks!

 

[Tim Chase]

dataset = cursor.fetchall()

for row in dataset:
print ( '''<tr> ''' )

date = row[2].strftime( '%d %b, %H:%M' )

print ( '''<td> %s</td> <td> %s</td> <td> %s</td> ''' %
( row[0], row[1], date ) )

Unfortunately had to ditch the 'for entry in row' line because
couldn't iterate over the items of the row.

Could you please shoe me how could i do the same thing with
iteration?!

Well, depending on whether "row" is a tuple or a list, you can do
either

row[2] = row[2].strftime(...) # if it's a list
# the assignment will fail if it's a tuple

or you can just iterate over a predefined list/tuple:

for row in dataset:
print ("<tr>")
for item in (row[0], row[1], row[2].strftime(...)):
print ("<td>%s</td" % item)
print ("</tr>")

Though I think I'd make it a bit clearer by naming the fields:

for host, hits, dt in dataset:
print ("<tr>")
for item in (host, hits, dt.strftime(...)):
print ("<td>%s</td>" % item)
print ("</tr>")

Or perhaps even just

print ("".join("<td>%s</td>" % item
for item in (host, hits, dt.strftime(...))
)

Whichever you prefer. I think I'm partial to the 2nd-from-last
version, especially as the list of fields may grow.

-tkc

 

[Íßêïò]

As i have it the returned 'dataset' is stored line per line to 'row'.

So,
'dataset' in here is a 'list of tuples' right?
and
'row' in here is a tuple form the above list of tuples right?

Am i understanding this correctly?!

Well, depending on whether "row" is a tuple or a list, you can do
either

It was a tuple. But it migth as well be a list too?!?!

Could 'dataset' be a 'list of lists' as well?

How one would know in which way the returned mysql data is saved in?

Though I think I'd make it a bit clearer by naming the fields:

   for host, hits, dt in dataset:
     print ("<tr>")
     for item in (host, hits, dt.strftime(...)):
       print ("<td>%s</td>" % item)
     print ("</tr>")

Cool! I myself like this solution best over the all working other!
very nice approach thank you very much! Is what i anted and couldn't
write myself!

But please tell me if in my example 'row' was a tuple, what kind of
objects is 'host', 'hits', 'dt' here and how do they sore the data?

Thanks again for the cool examples!

 

[Tim Chase]

So, 'dataset' in here is a 'list of tuples' right? and 'row'
in here is a tuple form the above list of tuples right?

Am i understanding this correctly?!

It was a tuple. But it migth as well be a list too?!?!

Could 'dataset' be a 'list of lists' as well?

Pretty much...it's either a list-of-tuples or a list-of-lists
(I'm not sure if is part of the DB-API spec to mandate one or the
other). For the most part, you can treat them as the same thing.
However, tuples are immutable, so you can't say

my_tuple[3] = some_value

but with a list you can:

my_list[3] = some_value

How one would know in which way the returned mysql data is saved in?

Well, you can ask:

print type(row)

(I *suspect* it's a tuple) or you can just tell it what to be:

for row in dataset:
row = list(row)
row[3] = row[3].strftime(...)
for item in row:
...

I don't usually have cause to write a value back into the data
I'm reading from the DB, so it's never really mattered to me
whether the DB gives me tuples or lists.

Cool! I myself like this solution best over the all working other!
very nice approach thank you very much! Is what i anted and couldn't
write myself!

But please tell me if in my example 'row' was a tuple, what kind of
objects is 'host', 'hits', 'dt' here and how do they sore the data?

Python supports "tuple assignment" which means that the following
are about[*] the same:

# variant A
for row in dataset:
host = row[0]
hits = row[1]
dt = row[2]
# rest of your code here

# variant B
for row in dataset:
host, hits, dt = row
# rest of your code here

# variant C
for host, hits, dt in row:
# rest of your code here

The data-type of the individual values would be whatever comes
back from the database as translated into Python (string,
float/Decimal, boolean, datetime, etc). In your example, it's
likely a string+integer+datetime as the 3 values. You can see
why I prefer the elegance of just performing the assignment in
the for-loop (variant C).

Hope this helps,

-tkc


[*] "about" the same because in #1 and #2, you also have access
to the whole row; whereas in #3, you don't have something called
"row", but you could reassemble it if you needed:

row = (host, hits, dt)

 

[John Nagle]

cursor.execute( ''' SELECT host, hits, date FROM visitors WHERE page
= '%s' ORDER BY date DESC ''' % (page) )

Don't do string substitution ("%") on SQL statements. Let MySQLdb do it
for you, with proper escaping:

cursor.execute('''SELECT host, hits, date FROM visitors WHERE page=%s
ORDER BY date DESC''', (page,))

The difference is that if some external source can control "page", and
they put in a value like

100 ; DELETE FROM visitors; SELECT * FROM visitors

you just lost your data.

John Nagle

 

[Íéêüëáïò Êïýñáò]

Óôéò 6/8/2010 2:46 ðì, ï/ç Tim Chase Ýãñáøå:

# variant B
for row in dataset:
host, hits, dt = row
# rest of your code here

So, row is a tuple comprising of 3 fields,
and host, hist, dt are variables assigned each one of row's tuple values
by breaking it to it's elements.

But what kind of objects is host, hits, dt that containes the row's
tuple data themselves? tuples or lists and why?

# variant C
for host, hits, dt in row:
# rest of your code here

host, hits, data each and every one of them hold a piece of the row's
tuple values.

But what happens in here?

'for host, hits, dt in dataset:'

Here we don't have the row tuple. So what tthose variabels store, and in
what datatype they strore info in and what is the difference between this
and

'for host, hits, dt in row:'

What datatypes are these vars here and what data each one hold?

The data-type of the individual values would be whatever comes back
from the database as translated into Python (string, float/Decimal,
boolean, datetime, etc). In your example, it's likely a
string+integer+datetime as the 3 values. You can see why I prefer the
elegance of just performing the assignment in the for-loop (variant C).

If the fieds datatypes returned form the database are for exmaple page
varchar(50) , hits inteeger[11], date datetime then
the when python grabs those results fields it would translate them to
'page as string' , (hits as int) , 'date as string' respectively?
Whcih emans it translated those fileds returned to the most
appropriate-most close to prototype stored in database' datatypes
automatically?

[*] "about" the same because in #1 and #2, you also have access to the
whole row; whereas in #3, you don't have something called "row", but
you could reassemble it if you needed:

row = (host, hits, dt

Would that be a row or a tuple when joined?

Again, thanks for ALL your preciosu help you provide me!

 

[Íßêïò]

Don't do string substitution ("%") on SQL statements.  Let MySQLdb do it
for you, with proper escaping:

    cursor.execute('''SELECT host, hits, date FROM visitors WHERE page=%s
        ORDER BY date DESC''', (page,))

Thanks i didn't know.
But you also do use '%s' here as well. Just without the quotes? Why?
How is this valid?
And also what's the comma after the (page,) ? What does the comam do?

The difference is that if some external source can control "page", and
they put in a value like

        100 ; DELETE FROM visitors; SELECT * FROM visitors

you just lost your data.

Thanks iam trying to test this because its very interesting and when i
try:

http://webville.gr/index.html?show=log&page="index.html ; DELETE FROM
visitors; SELECT * FROM visitors"

cgitb gives me an error

53 except MySQLdb.Error:
54 print ( "Error %d: %s" % (e.args[0],
e.args[1]) )
55 else:
56 #display dataset
e undefined
NameError: name 'e' is not defined
args = ("name 'e' is not defined",)

How can i try it successfully?
Have to ssay here that i use mod_rewrite in my remote web server and
every incoming html request gets treated by counter.py with this rule

RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^/?(.+\.html) /cgi-bin/counter.py?page=$1 [L,PT,QSA]

Also for the program exectuion to reach the:

cursor.execute( ''' SELECT host, hits, date FROM visitors WHERE page =
'%s' ORDER BY date DESC ''' % (page) )

statement i expect the user to:

#
=================================================================================================================
# if extra string is attached to the URL is 'log' then show excplicit
page log and exit
#
=================================================================================================================
if form.getvalue('show') == 'log':

Please help me reproduce what you suggest. I beleive its called MySQL
injection and i very like want to see this in action!

 

[Tim Chase]

So, row is a tuple comprising of 3 fields, and host, hist, dt
are variables assigned each one of row's tuple values by
breaking it to it's elements.

But what kind of objects is host, hits, dt that containes the
row's tuple data themselves? tuples or lists and why?

They contain the data of each respective element. E.g.:

>>> dataset = [

.... (1, 'a', True),
.... (2, 'b', False),
.... ].... print 'one%s = %r' % (type(one), one)
.... print 'two%s = %r' % (type(two), two)
.... print 'three%s = %r' % (type(three), three)
.... print '-' * 10
....
one<type 'int'> = 1
two<type 'str'> = 'a'
three<type 'bool'> = True
----------
one<type 'int'> = 2
two<type 'str'> = 'b'
three<type 'bool'> = False
----------

So likely in your case, "host" is a string, "hits" is an int, and
"dt" is a datetime.datetime object. The three of them together
are the row as represented as a tuple:
<type 'tuple'>

which you can see in your own code by changing it temporarily to:

for row in dataset:
print type(row), len(row)

host, hits, data each and every one of them hold a piece of the row's
tuple values.

But what happens in here?

The same as Variant B, only it doesn't use the intermediate tuple
"row".

'for host, hits, dt in dataset:'

Here we don't have the row tuple. So what tthose variabels store, and in
what datatype they strore info in and what is the difference between this
and

'for host, hits, dt in row:'

The second one will fail because it would be the same as

for tpl in row:
host, hits, dt = tpl

The 1st time through the loop, tpl=host; the 2nd time through the
loop, tpl=hits; and the 3rd time through the loop, tpl=dt

Attempting to do a tuple assignment (that 2nd line) will attempt
to do something like

host, hits, dt = "example.com" # 1st pass through the loop
host, hits, dt = 42 # 2nd pass through the loop
host, hits, dt = datetime(2010,7,5)# 3rd pass through the loop

In most cases, it will fail on the first pass through the loop
(except in the freak case your string value happens to have 3
characters:
'a'
)

If the fieds datatypes returned form the database are for exmaple page
varchar(50) , hits inteeger[11], date datetime then
the when python grabs those results fields it would translate them to
'page as string' , (hits as int) , 'date as string' respectively?
Whcih emans it translated those fileds returned to the most
appropriate-most close to prototype stored in database' datatypes
automatically?

Yes, except the internals (of the DB module...in this case mysql)
are smart enough to translate the date into a datetime.datetime
object, instead of a string.

Would that be a row or a tuple when joined?

A "row" is a conceptual thing -- one row of data from your query.
It can be represented as either a tuple or a list (or any
iteratable that represents "things in this row"). In this case
(and I believe each row returned by a cursor.fetch*() call), it
was tuple.

I hope that helps...it would behoove you to experiment with
tuple-assignments such as the example code above so that you
understand what it's doing in each case.

-tkc

 

[Dennis Lee Bieber]

But you also do use '%s' here as well. Just without the quotes? Why?

1) please read the DB-API PEP (PEP 249)
http://www.python.org/dev/peps/pep-0249/

It describes the basic requirements of all Python standard database
adapters. Then read the documentation specific to MySQLdb.
http://mysql-python.sourceforge.net/MySQLdb.html

How is this valid?

Short answer: It's valid because that is what MySQLdb uses for a
placeholder. SQLite uses a ?.

Long answer requires one study both the MySQL C-language interface
and the Python source code for the cursor operations (for MySQL versions
3 and 4 -- MySQL 5 supports those but adds prepared statements which
MySQLdb does not support).

And also what's the comma after the (page,) ? What does the comam do?

Read the Python documentation... Try the Python Library Reference,
section 3.6 in particular (at least in my Python 2.5; don't know if
major sections changed in 3.x).

Thanks iam trying to test this because its very interesting and when i
try:

http://webville.gr/index.html?show=log&page="index.html ; DELETE FROM
visitors; SELECT * FROM visitors"

cgitb gives me an error

53 except MySQLdb.Error:
54 print ( "Error %d: %s" % (e.args[0],
e.args[1]) )
55 else:
56 #display dataset
e undefined
NameError: name 'e' is not defined
args = ("name 'e' is not defined",)

How can i try it successfully?

Define the variable "e".

Are you using Python 2.x or 3.x? Language reference manual section
7.4 covers the try/except clause.

That will let you see what the MySQLdb error reported.

 

[rahul mishra]

try this

test = time.time(2011, 2, 1, 2, 4, 10)
# this is your datetime object from mysql

print time.mktime(test.timetuple())

hope this would help you

Okey, i have many hours now struggling to convert a mysql datetime
field that i retreive to a string of this format '%d %b, %H:%M'

I google a lot but couldnt found out how to format it being a string

Here si the code so far:

try:
cursor.execute( ''' SELECT host, hits, date FROM visitors WHERE page
=3D '%s' ORDER BY date DESC ''' % (page) )
except MySQLdb.Error:
print( "Error %d: %s" % (e.args[0], e.args[1]) )
else:
print ( '''<center><br><h3> ( =C5=F0=E9=F3=EA=DD=F0=F4=E7=F2 ) ----- ( =
=C5=F0=E9=F3=EA=DD=F8=E5=E9=F2 )
----- ( =C7=EC=E5=F1=EF=EC=E7=ED=DF=E1 ) </h3><br>''' )
print ( '''<table border =3D "5" cellpadding =3D "5">''' )

results =3D cursor.fetchall()

for row in results:
print ( ''' <tr> ''' )

for entry in row:
entry =3D datetime.datetime.strftime( entry, '%d %b, %H:%M' ) #!!!
this is wrong!
print ( ''' <td> %s </td> ''' % entry )

sys.exit(0)

Apart from that i do not know how iam supposed to print it, because the
date string is the 3rd string in every row of the dataset.

Please help me out!

As you state, it is the third item in each returned row... So why
are you trying to treat EVERY item in the row as a date?

Since MySQLdb appears to return datetime objects (my quick test is
showing datetime.date for dates in a test database) you should be
probably be using

formatted_entry = entry.strftime("%d... %M")

to do the formatting as string

r entry in row:
=C2=A0 =C2=A0 =C2=A0 =C2=A0entry =3D datetime.datetime.strftime( entry, '%d=
%b, %H:%M' ) #!!!
=C2=A0 =C2=A0 =C2=A0 =C2=A0print ( ''' <td> %s </td> ''' % entry )
turned row... So why

Because when i try to prin the 3 items liek that

print row[0], row[1], row[2]

it gives me an error, so i dont knwo how to tell it how to print the
3rd item differently.



cts (my quick test is
)

I tried that myself yesterday but look it fails to the following
message

/home/webville/public_html/cgi-bin/index.py
63
64 for entry in row:
65 formatted_entry =3D
entry.strftime('%d %b, %H:%M')
66 print ( ''' <td> %s </td> ''' %
entry )
67
formatted_entry undefined, entry =3D '178-124-186.dynamic.cyta.gr',
entry.strftime undefined
AttributeError: 'str' object has no attribute 'strftime'
args =3D ("'str' object has no attribute 'strftime'",)

-)

dataset = cursor.fetchall()

for row in dataset:
print ( ''' <tr> ''' )

date = row[2].strftime( '%d %b, %H:%M' )

print ( ''' <td> %s </td> <td> %s </td> <td> %s </td> ''' %
( row[0], row[1], date ) )

Unfortunately had to ditch the 'for entry in row' line because
could not iterate over the items of the row.

Could you please shoe me how could i do the same thing with
iteration?!
Thanks!

52, ?????????? wrote:

Well, depending on whether "row" is a tuple or a list, you can do
either

row[2] = row[2].strftime(...) # if it is a list

or you can just iterate over a predefined list/tuple:

for row in dataset:
print ("<tr>")
for item in (row[0], row[1], row[2].strftime(...)):
print ("<td>%s</td" % item)
print ("</tr>")

Though I think I'd make it a bit clearer by naming the fields:

for host, hits, dt in dataset:
print ("<tr>")
for item in (host, hits, dt.strftime(...)):
print ("<td>%s</td>" % item)
print ("</tr>")

Or perhaps even just

print ("".join("<td>%s</td>" % item
for item in (host, hits, dt.strftime(...))
)

Whichever you prefer. I think I am partial to the 2nd-from-last
version, especially as the list of fields may grow.

-tkc

01, ????? wrote:

Pretty much...it is either a list-of-tuples or a list-of-lists
(I am not sure if is part of the DB-API spec to mandate one or the
other). For the most part, you can treat them as the same thing.
However, tuples are immutable, so you cannot say

my_tuple[3] = some_value

but with a list you can:

my_list[3] = some_value


Well, you can ask:

print type(row)

(I *suspect* it is a tuple) or you can just tell it what to be:

for row in dataset:
row = list(row)
row[3] = row[3].strftime(...)
for item in row:
...

I do not usually have cause to write a value back into the data
I am reading from the DB, so it is never really mattered to me
whether the DB gives me tuples or lists.


Python supports "tuple assignment" which means that the following
are about[*] the same:

for row in dataset:
host = row[0]
hits = row[1]
dt = row[2]

for row in dataset:
host, hits, dt = row

for host, hits, dt in row:

The data-type of the individual values would be whatever comes
back from the database as translated into Python (string,
float/Decimal, boolean, datetime, etc). In your example, it is
likely a string+integer+datetime as the 3 values. You can see
why I prefer the elegance of just performing the assignment in
the for-loop (variant C).

Hope this helps,

-tkc


[*] "about" the same because in #1 and #2, you also have access
to the whole row; whereas in #3, you do not have something called
"row", but you could reassemble it if you needed:

row = (host, hits, dt)

46 ??, ?/? Tim Chase ??????:
So, row is a tuple comprising of 3 fields,
and host, hist, dt are variables assigned each one of row's tuple values
by breaking it to it is elements.

But what kind of objects is host, hits, dt that containes the row's
tuple data themselves? tuples or lists and why?

host, hits, data each and every one of them hold a piece of the row's
tuple values.

But what happens in here?

'for host, hits, dt in dataset:'

Here we do not have the row tuple. So what tthose variabels store, and in
what datatype they strore info in and what is the difference between this
and

'for host, hits, dt in row:'

What datatypes are these vars here and what data each one hold?


If the fieds datatypes returned form the database are for exmaple page
varchar(50) , hits inteeger[11], date datetime then
the when python grabs those results fields it would translate them to
'page as string' , (hits as int) , 'date as string' respectively?
Whcih emans it translated those fileds returned to the most
appropriate-most close to prototype stored in database' datatypes
automatically?


Would that be a row or a tuple when joined?

Again, thanks for ALL your preciosu help you provide me!

On Saturday, August 07, 2010 3:09 AM ????? wrote:
t, hits, date FROM visitors WHERE page
o it
RE page=3D%s

Thanks i did not know.
But you also do use '%s' here as well. Just without the quotes? Why?
How is this valid?
And also what is the comma after the (page,) ? What does the comam do?

itors

Thanks iam trying to test this because its very interesting and when i
try:

http://webville.gr/index.html?show=3Dlog&page=3D"index.html ; DELETE FROM
visitors; SELECT * FROM visitors"

cgitb gives me an error

53 except MySQLdb.Error:
54 print ( "Error %d: %s" % (e.args[0],
e.args[1]) )
55 else:
56 #display dataset
e undefined
NameError: name 'e' is not defined
args =3D ("name 'e' is not defined",)

How can i try it successfully?
Have to ssay here that i use mod_rewrite in my remote web server and
every incoming html request gets treated by counter.py with this rule

RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^/?(.+\.html) /cgi-bin/counter.py?page=3D$1 [L,PT,QSA]

Also for the program exectuion to reach the:

cursor.execute( ''' SELECT host, hits, date FROM visitors WHERE page =3D
'%s' ORDER BY date DESC ''' % (page) )

statement i expect the user to:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
page log and exit
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
if form.getvalue('show') =3D=3D 'log':

Please help me reproduce what you suggest. I beleive its called MySQL
injection and i very like want to see this in action!

45, ???????? ?????? wrote:

They contain the data of each respective element. E.g.:

... (1, 'a', True),
... (2, 'b', False),
... ]
... print 'one%s = %r' % (type(one), one)
... print 'two%s = %r' % (type(two), two)
... print 'three%s = %r' % (type(three), three)
... print '-' * 10
...
one<type 'int'> = 1
two<type 'str'> = 'a'
three<type 'bool'> = True
----------
one<type 'int'> = 2
two<type 'str'> = 'b'
three<type 'bool'> = False
----------

So likely in your case, "host" is a string, "hits" is an int, and
"dt" is a datetime.datetime object. The three of them together
are the row as represented as a tuple:

<type 'tuple'>

which you can see in your own code by changing it temporarily to:

for row in dataset:
print type(row), len(row)


The same as Variant B, only it does not use the intermediate tuple
"row".


The second one will fail because it would be the same as

for tpl in row:
host, hits, dt = tpl

The 1st time through the loop, tpl=host; the 2nd time through the
loop, tpl=hits; and the 3rd time through the loop, tpl=dt

Attempting to do a tuple assignment (that 2nd line) will attempt
to do something like

host, hits, dt = "example.com" # 1st pass through the loop
host, hits, dt = 42 # 2nd pass through the loop
host, hits, dt = datetime(2010,7,5)# 3rd pass through the loop

In most cases, it will fail on the first pass through the loop
(except in the freak case your string value happens to have 3
characters:

'a'
)


Yes, except the internals (of the DB module...in this case mysql)
are smart enough to translate the date into a datetime.datetime
object, instead of a string.


A "row" is a conceptual thing -- one row of data from your query.
It can be represented as either a tuple or a list (or any
iteratable that represents "things in this row"). In this case
(and I believe each row returned by a cursor.fetch*() call), it
was tuple.

I hope that helps...it would behoove you to experiment with
tuple-assignments such as the example code above so that you
understand what it is doing in each case.

-tkc

 

[Corey Richardson]

try this

test = time.time(2011, 2, 1, 2, 4, 10)
# this is your datetime object from mysql

print time.mktime(test.timetuple())

hope this would help you

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