大约有 40,000 项符合查询结果（耗时：0.0477秒） [XML]
Split string every nth character?
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>>> line = '1234567890'
>>> n = 2
>>> [line[i:i+n] for i in range(0, len(line), n)]
['12', '34', '56', '78', '90']
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Removing first x characters from string?
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>>> text = 'lipsum'
>>> text[3:]
'sum'
See the official documentation on strings for more information and this SO answer for a concise summary of the notation.
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iPhone 5 CSS media query
... iPhone 5 does not have a 16:9 aspect ratio. It is in fact 40:71.
iPhone < 5:
@media screen and (device-aspect-ratio: 2/3) {}
iPhone 5:
@media screen and (device-aspect-ratio: 40/71) {}
iPhone 6:
@media screen and (device-aspect-ratio: 375/667) {}
iPhone 6 Plus:
@media screen and (device-aspe...
How to enable C++11/C++0x support in Eclipse CDT?
...Once created, right-click the project and go to "Properties"
C/C++ Build -> Settings -> Tool Settings -> GCC C++ Compiler -> Miscellaneous -> Other Flags. Put -std=c++0x (or for newer compiler version -std=c++11 at the end . ... instead of GCC C++ Compiler I have also Cygwin compiler
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finding and replacing elements in a list
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>>> a= [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1]
>>> for n, i in enumerate(a):
... if i == 1:
... a[n] = 10
...
>>> a
[10, 2, 3, 4, 5, 10, 2, 3, 4, 5, 10]
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Parse date string and change format
...ing, format1).strftime(format2)
For the specific example you could do
>>> datetime.datetime.strptime('Mon Feb 15 2010', '%a %b %d %Y').strftime('%d/%m/%Y')
'15/02/2010'
>>>
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Center content of UIScrollView when smaller
...e Developer Forums, looked at the code for three20, ScrollingMadness, ScrollTestSuite, etc. I've tried enlarging the UIImageView frame, playing with the UIScrollView's offset and/or insets from the ViewController, etc. but nothing worked great (as everyone else has found out too).
After sleeping on...
super() raises “TypeError: must be type, not classobj” for new-style class
...at the correct test for "is this a new-style instance (i.e. object)?" is
>>> class OldStyle: pass
>>> instance = OldStyle()
>>> issubclass(instance.__class__, object)
False
and not (as in the question):
>>> isinstance(instance, object)
True
For classes, the ...
When to use %r instead of %s in Python? [duplicate]
...sly recreate the object it represents.
Here's an example, using a date:
>>> import datetime
>>> d = datetime.date.today()
>>> str(d)
'2011-05-14'
>>> repr(d)
'datetime.date(2011, 5, 14)'
Types for which repr() doesn't produce Python syntax include those that p...
Is it possible to use 'else' in a list comprehension? [duplicate]
...therwise, it evaluates to c. It can be used in comprehension statements:
>>> [a if a else 2 for a in [0,1,0,3]]
[2, 1, 2, 3]
So for your example,
table = ''.join(chr(index) if index in ords_to_keep else replace_with
for index in xrange(15))
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