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Kirill Smelkov
cpython
Commits
a974b393
Commit
a974b393
authored
Jan 13, 2003
by
Andrew M. Kuchling
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Move the date/time section into the modules section; it was in the
C API section by mistake
parent
07f9398d
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Doc/whatsnew/whatsnew23.tex
Doc/whatsnew/whatsnew23.tex
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Doc/whatsnew/whatsnew23.tex
View file @
a974b393
...
...
@@ -1647,6 +1647,67 @@ Any breakage caused by this change should be reported as a bug.
\end{itemize}
%======================================================================
\subsection
{
Date/Time Type
}
Date and time types suitable for expressing timestamps were added as
the
\module
{
datetime
}
module. The types don't support different
calendars or many fancy features, and just stick to the basics of
representing time.
The three primary types are:
\class
{
date
}
, representing a day, month,
and year;
\class
{
time
}
, consisting of hour, minute, and second; and
\class
{
datetime
}
, which contains all the attributes of both
\class
{
date
}
and
\class
{
time
}
. These basic types don't understand
time zones, but there are subclasses named
\class
{
timetz
}
and
\class
{
datetimetz
}
that do. There's also a
\class
{
timedelta
}
class representing a difference between two points
in time, and time zone logic is implemented by classes inheriting from
the abstract
\class
{
tzinfo
}
class.
You can create instances of
\class
{
date
}
and
\class
{
time
}
by either
supplying keyword arguments to the appropriate constructor,
e.g.
\code
{
datetime.date(year=1972, month=10, day=15)
}
, or by using
one of a number of class methods. For example, the
\method
{
today()
}
class method returns the current local date.
Once created, instances of the date/time classes are all immutable.
There are a number of methods for producing formatted strings from
objects:
\begin{verbatim}
>>> import datetime
>>> now = datetime.datetime.now()
>>> now.isoformat()
'2002-12-30T21:27:03.994956'
>>> now.ctime() # Only available on date, datetime
'Mon Dec 30 21:27:03 2002'
>>> now.strftime('
%Y %d %h')
'2002 30 Dec'
\end{verbatim}
The
\method
{
replace()
}
method allows modifying one or more fields
of a
\class
{
date
}
or
\class
{
datetime
}
instance:
\begin{verbatim}
>>> d = datetime.datetime.now()
>>> d
datetime.datetime(2002, 12, 30, 22, 15, 38, 827738)
>>> d.replace(year=2001, hour = 12)
datetime.datetime(2001, 12, 30, 12, 15, 38, 827738)
>>>
\end{verbatim}
Instances can be compared, hashed, and converted to strings (the
result is the same as that of
\method
{
isoformat()
}
).
\class
{
date
}
and
\class
{
datetime
}
instances can be subtracted from each other, and
added to
\class
{
timedelta
}
instances.
For more information, refer to the
\ulink
{
module's reference
documentation
}{
http://www.python.org/dev/doc/devel/lib/module-datetime.html
}
.
(Contributed by Tim Peters.)
%======================================================================
\subsection
{
The
\module
{
optparse
}
Module
}
...
...
@@ -1904,67 +1965,6 @@ Expat.
\end
{
itemize
}
%======================================================================
\subsection
{
Date
/
Time Type
}
Date and time types suitable for expressing timestamps were added as
the
\module
{
datetime
}
module. The types don't support different
calendars or many fancy features, and just stick to the basics of
representing time.
The three primary types are:
\class
{
date
}
, representing a day, month,
and year;
\class
{
time
}
, consisting of hour, minute, and second; and
\class
{
datetime
}
, which contains all the attributes of both
\class
{
date
}
and
\class
{
time
}
. These basic types don't understand
time zones, but there are subclasses named
\class
{
timetz
}
and
\class
{
datetimetz
}
that do. There's also a
\class
{
timedelta
}
class representing a difference between two points
in time, and time zone logic is implemented by classes inheriting from
the abstract
\class
{
tzinfo
}
class.
You can create instances of
\class
{
date
}
and
\class
{
time
}
by either
supplying keyword arguments to the appropriate constructor,
e.g.
\code
{
datetime.date
(
year
=
1972
, month
=
10
, day
=
15
)
}
, or by using
one of a number of class methods. For example, the
\method
{
today
()
}
class method returns the current local date.
Once created, instances of the date
/
time classes are all immutable.
There are a number of methods for producing formatted strings from
objects:
\begin
{
verbatim
}
>>> import datetime
>>> now
=
datetime.datetime.now
()
>>> now.isoformat
()
'
2002
-
12
-
30
T
21
:
27
:
03
.
994956
'
>>> now.ctime
()
# Only available on date, datetime
'Mon Dec
30
21
:
27
:
03
2002
'
>>> now.strftime
(
'
%Y %d %h')
'
2002
30
Dec'
\end
{
verbatim
}
The
\method
{
replace
()
}
method allows modifying one or more fields
of a
\class
{
date
}
or
\class
{
datetime
}
instance:
\begin
{
verbatim
}
>>> d
=
datetime.datetime.now
()
>>> d
datetime.datetime
(
2002
,
12
,
30
,
22
,
15
,
38
,
827738
)
>>> d.replace
(
year
=
2001
, hour
=
12
)
datetime.datetime
(
2001
,
12
,
30
,
12
,
15
,
38
,
827738
)
>>>
\end
{
verbatim
}
Instances can be compared, hashed, and converted to strings
(
the
result is the same as that of
\method
{
isoformat
()
}
)
.
\class
{
date
}
and
\class
{
datetime
}
instances can be subtracted from each other, and
added to
\class
{
timedelta
}
instances.
For more information, refer to the
\ulink
{
module's reference
documentation
}{
http:
//
www.python.org
/
dev
/
doc
/
devel
/
lib
/
module
-
datetime.html
}
.
(
Contributed by Tim Peters.
)
%======================================================================
\subsection
{
Port
-
Specific Changes
}
...
...
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