blocks|key|3264970|text|您可以在Python的datetime包中使用strptime：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3264971|>>>+import+datetime
>>>+datetime.datetime.strptime('24052010',+"%25d%25m%25Y").date()
datetime.date(2010,+5,+24)|code-block|syntax|javascript|3264972|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/library/datetime.html|1|http://docs.python.org/library/datetime.html#strftime-and-strptime-behavior^0|B|8|N|8|B|8|0|N|8|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]|$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]|S|$5|N|O|P|E|$Q|T]]]]

You can use <a href="http://docs.python.org/library/datetime.html#strftime-and-strptime-behavior" rel="noreferrer"><code>strptime</code></a> in the <a href="http://docs.python.org/library/datetime.html" rel="noreferrer"><code>datetime</code></a> package of Python:

<pre><code>&gt;&gt;&gt; import datetime
&gt;&gt;&gt; datetime.datetime.strptime('24052010', "%d%m%Y").date()
datetime.date(2010, 5, 24)
</code></pre>

blocks|key|1856882|text|import+datetime
datetime.datetime.strptime('24052010',+'%25d%25m%25Y').date()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1856883|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import datetime
datetime.datetime.strptime('24052010', '%d%m%Y').date()
</code></pre>

blocks|key|1857005|text|与直接相关的问题：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1857006|如果你有|1857007|datetime.datetime.strptime("2015-02-24T13:00:00-08:00",+"%25Y-%25B-%25dT%25H:%25M:%25S-%25H:%25M").date()|code-block|syntax|javascript|1857008|然后你会得到：|1857009|Traceback+(most+recent+call+last):
++File+"<stdin>",+line+1,+in+<module>
++File+"/usr/local/lib/python2.7/_strptime.py",+line+308,+in+_strptime
++++format_regex+=+_TimeRE_cache.compile(format)
++File+"/usr/local/lib/python2.7/_strptime.py",+line+265,+in+compile
++++return+re_compile(self.pattern(format),+IGNORECASE)
++File+"/usr/local/lib/python2.7/re.py",+line+194,+in+compile
++++return+_compile(pattern,+flags)
++File+"/usr/local/lib/python2.7/re.py",+line+251,+in+_compile
++++raise+error,+v+#+invalid+expression
sre_constants.error:+redefinition+of+group+name+'H'+as+group+7;+was+group+4|1857010|你试过了：|1857011|<-24T13:00:00-08:00",+"%25Y-%25B-%25dT%25HH:%25MM:%25SS-%25HH:%25MM").date()|1857012|但是你仍然会得到上面的回溯。|1857013|答案：|1857014|>>>+from+dateutil.parser+import+parse
>>>+from+datetime+import+datetime
>>>+parse("2015-02-24T13:00:00-08:00")
datetime.datetime(2015,+2,+24,+13,+0,+tzinfo=tzoffset(None,+-28800))|1857015|entityMap^0|1|8|0|0|0|0|0|0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1B|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|10|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|11|$]]

Directly related question:

What if you have

<pre><code>datetime.datetime.strptime("2015-02-24T13:00:00-08:00", "%Y-%B-%dT%H:%M:%S-%H:%M").date()
</code></pre>

and you get:

<pre><code>Traceback (most recent call last):
 File "&lt;stdin&gt;", line 1, in &lt;module&gt;
 File "/usr/local/lib/python2.7/_strptime.py", line 308, in _strptime
 format_regex = _TimeRE_cache.compile(format)
 File "/usr/local/lib/python2.7/_strptime.py", line 265, in compile
 return re_compile(self.pattern(format), IGNORECASE)
 File "/usr/local/lib/python2.7/re.py", line 194, in compile
 return _compile(pattern, flags)
 File "/usr/local/lib/python2.7/re.py", line 251, in _compile
 raise error, v # invalid expression
sre_constants.error: redefinition of group name 'H' as group 7; was group 4
</code></pre>

and you tried:

<pre><code>&lt;-24T13:00:00-08:00", "%Y-%B-%dT%HH:%MM:%SS-%HH:%MM").date()
</code></pre>

but you still get the traceback above. 

Answer:

<pre><code>&gt;&gt;&gt; from dateutil.parser import parse
&gt;&gt;&gt; from datetime import datetime
&gt;&gt;&gt; parse("2015-02-24T13:00:00-08:00")
datetime.datetime(2015, 2, 24, 13, 0, tzinfo=tzoffset(None, -28800))
</code></pre>

blocks|key|447178|text|如果你很懒，不想和字符串打架，你可以直接使用parser模块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|447179|from+dateutil+import+parser
dt+=+parser.parse("Jun+1+2005++1:33PM")
print(dt.year,+dt.month,+dt.day,dt.hour,+dt.minute,+dt.second)
>2005+6+1+13+33+0|code-block|syntax|javascript|447180|只需一个旁注，因为我们正在尝试匹配any字符串表示，它比strptime慢10倍|BOLD|447181|entityMap^0|M|6|0|0|2|4|H|3|S|8|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|S|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|T|8|@$9|U|A|V|B|M]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|N|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|O|$]]

If you are lazy and don't want to fight with string literals, you can just go with the <code>parser</code> module. 

<pre><code>from dateutil import parser
dt = parser.parse("Jun 1 2005 1:33PM")
print(dt.year, dt.month, dt.day,dt.hour, dt.minute, dt.second)
&gt;2005 6 1 13 33 0
</code></pre>

Just a side note, as we are trying to match <code>any</code> string representation, it is 10x slower than <code>strptime</code>

blocks|key|3265214|text|你有一个像这样的日期字符串，"24052010“，你需要这个的date对象，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3265215|from+datetime+import+datetime
cus_date+=+datetime.strptime("24052010",+"%25d%25m%25Y").date()|code-block|syntax|javascript|3265216|此cus_date将为您提供日期对象。|3265217|您可以使用下面的代码从date对象中检索日期字符串，|3265218|cus_date.strftime("%25d%25m%25Y")|3265219|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

you have a date string like this, "24052010" and you want date object for this,

<pre><code>from datetime import datetime
cus_date = datetime.strptime("24052010", "%d%m%Y").date()
</code></pre>

this cus_date will give you date object.

you can retrieve date string from your date object using this,

<pre><code>cus_date.strftime("%d%m%Y")
</code></pre>

blocks|key|3265308|text|对于单值，+datetime.strptime+方法是最快的|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|3265309|import+arrow
from+datetime+import+datetime
import+pandas+as+pd

l+=+['24052010']

%25timeit+_+=+list(map(lambda+x:+datetime.strptime(x,+'%25d%25m%25Y').date(),+l))
6.86+µs+±+56.5+ns+per+loop+(mean+±+std.+dev.+of+7+runs,+100000+loops+each)

%25timeit+_+=+list(map(lambda+x:+x.date(),+pd.to_datetime(l,+format='%25d%25m%25Y')))
305+µs+±+6.32+µs+per+loop+(mean+±+std.+dev.+of+7+runs,+1000+loops+each)

%25timeit+_+=+list(map(lambda+x:+arrow.get(x,+'DMYYYY').date(),+l))
46+µs+±+978+ns+per+loop+(mean+±+std.+dev.+of+7+runs,+10000+loops+each)|code-block|syntax|javascript|3265310|有关值列表的信息，pandas+pd.to_datetime+是最快的|3265311|l+=+['24052010']+*+1000

%25timeit+_+=+list(map(lambda+x:+datetime.strptime(x,+'%25d%25m%25Y').date(),+l))
6.32+ms+±+89.6+µs+per+loop+(mean+±+std.+dev.+of+7+runs,+100+loops+each)

%25timeit+_+=+list(map(lambda+x:+x.date(),+pd.to_datetime(l,+format='%25d%25m%25Y')))
1.76+ms+±+27.3+µs+per+loop+(mean+±+std.+dev.+of+7+runs,+1000+loops+each)

%25timeit+_+=+list(map(lambda+x:+arrow.get(x,+'DMYYYY').date(),+l))
44.5+ms+±+522+µs+per+loop+(mean+±+std.+dev.+of+7+runs,+10+loops+each)|3265312|ISO8601+datetime格式的++是一个火箭|3265313|import+ciso8601

l+=+['2010-05-24']+*+1000

%25timeit+_+=+list(map(lambda+x:+ciso8601.parse_datetime(x).date(),+l))
241+µs+±+3.24+µs+per+loop+(mean+±+std.+dev.+of+7+runs,+1000+loops+each)|3265314|entityMap^0|6|H|O|6|6|H|0|0|G|E|G|E|0|0|L|5|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|12|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|D]]|E|@]|F|$]]|$1|N|3|O|5|I|7|18|8|@]|E|@]|F|$J|K]]|$1|P|3|Q|5|6|7|19|8|@$9|1A|A|1B|B|C]]|E|@]|F|$]]|$1|R|3|S|5|I|7|1C|8|@]|E|@]|F|$J|K]]|$1|T|3|-4|5|6|7|1D|8|@]|E|@]|F|$]]]|U|$]]

For single value the <code>datetime.strptime</code> method is the fastest
<pre class="lang-py prettyprint-override"><code>import arrow
from datetime import datetime
import pandas as pd

l = ['24052010']

%timeit _ = list(map(lambda x: datetime.strptime(x, '%d%m%Y').date(), l))
6.86 µs ± 56.5 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

%timeit _ = list(map(lambda x: x.date(), pd.to_datetime(l, format='%d%m%Y')))
305 µs ± 6.32 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit _ = list(map(lambda x: arrow.get(x, 'DMYYYY').date(), l))
46 µs ± 978 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
</code></pre>
For a list of values the pandas <code>pd.to_datetime</code> is the fastest
<pre class="lang-py prettyprint-override"><code>l = ['24052010'] * 1000

%timeit _ = list(map(lambda x: datetime.strptime(x, '%d%m%Y').date(), l))
6.32 ms ± 89.6 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

%timeit _ = list(map(lambda x: x.date(), pd.to_datetime(l, format='%d%m%Y')))
1.76 ms ± 27.3 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit _ = list(map(lambda x: arrow.get(x, 'DMYYYY').date(), l))
44.5 ms ± 522 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
</code></pre>
For ISO8601 datetime format the <a href="https://pypi.org/project/ciso8601/" rel="noreferrer"><code>ciso8601</code></a> is a rocket
<pre class="lang-py prettyprint-override"><code>import ciso8601

l = ['2010-05-24'] * 1000

%timeit _ = list(map(lambda x: ciso8601.parse_datetime(x).date(), l))
241 µs ± 3.24 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
</code></pre>

blocks|key|447135|text|还有另一个名为arrow的库可以很好地处理python日期。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|447136|import+arrow
import+datetime

a+=+arrow.get('24052010',+'DMYYYY').date()
print(isinstance(a,+datetime.date))+#+True|code-block|syntax|javascript|447137|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/crsmithdev/arrow^0|7|5|7|5|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

There is another library called <a href="https://github.com/crsmithdev/arrow" rel="nofollow"><code>arrow</code></a> really great to make manipulation on python date.

<pre><code>import arrow
import datetime

a = arrow.get('24052010', 'DMYYYY').date()
print(isinstance(a, datetime.date)) # True
</code></pre>

blocks|key|3265125|text|使用时间模块转换数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3265126|代码片段：|3265127|import+time+
tring='20150103040500'
var+=+int(time.mktime(time.strptime(tring,+'%25Y%25m%25d%25H%25M%25S')))
print+var|code-block|syntax|javascript|3265128|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use time module to convert data.

Code snippet:

<pre><code>import time 
tring='20150103040500'
var = int(time.mktime(time.strptime(tring, '%Y%m%d%H%M%S')))
print var
</code></pre>

How do I convert a string to a date object in python? 

The string would be: <code>"24052010"</code> (corresponding to the format: <code>"%d%m%Y"</code>)

I don't want a datetime.datetime object, but rather a datetime.date.

Python date string to date object

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何在python中将字符串转换为date对象？字符串将是："24052010" (对应于格式："%d%m%Y")我不想要datetime.datetime对象，而要datetime.date。

问Python日期字符串到日期对象
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回答 8

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