大约有 41,100 项符合查询结果（耗时：0.0355秒） [XML]
汇编语言（王爽著）附书签 - 文档下载 - 清泛网 - 专注C/C++及内核技术
...自己学，看了很多书，国内像这样的好书真的是很难得。3、更珍贵的是老师的编排，可以说比国外的还好（当然从知识点来说不如国外的书，但是这是一本入门书）
我的感想：1、计算机科学方面的好书，中国基本上没有（运...
Python “extend” for a dictionary
...
phoenix
3,20611 gold badge2727 silver badges3131 bronze badges
answered Feb 23 '09 at 11:01
Nick FortescueNic...
Pandas groupby: How to get a union of strings
...
In [5]: df
Out[5]:
A B C
0 1 0.749065 This
1 2 0.301084 is
2 3 0.463468 a
3 4 0.643961 random
4 1 0.866521 string
5 2 0.120737 !
In [6]: df.dtypes
Out[6]:
A int64
B float64
C object
dtype: object
When you apply your own function, t...
Numbering rows within groups in a data frame
...
answered Oct 16 '12 at 23:41
mnelmnel
103k2424 gold badges240240 silver badges239239 bronze badges
...
What does the 'b' character do in front of a string literal?
... it indicates that the
literal should become a bytes literal
in Python 3 (e.g. when code is
automatically converted with 2to3). A
'u' or 'b' prefix may be followed by
an 'r' prefix.
The Python 3 documentation states:
Bytes literals are always prefixed with 'b' or 'B'; they produce an...
Why isn't String.Empty a constant?
...
|
edited Feb 3 '09 at 17:31
answered Feb 3 '09 at 17:24
...
ADT requires 'org.eclipse.wst.sse.core 0.0.0' but it could not be found
...
I've just encountered exactly the same problem in Eclipse 3.6 (Helios). After plenty of Googling I came across this link:
http://code.google.com/intl/es/eclipse/docs/faq.html#wstinstallerror
During installation, there's an error
about requiring
org.eclipse.wst.sse.ui. How d...
Pelican 3.3 pelican-quickstart error “ValueError: unknown locale: UTF-8”
When I was trying to use pelican3.3, I typed the commend "pelican-quickstart", some errors showed up.
6 Answers
...
Numpy: Get random set of rows from 2D array
...
>>> A = np.random.randint(5, size=(10,3))
>>> A
array([[1, 3, 0],
[3, 2, 0],
[0, 2, 1],
[1, 1, 4],
[3, 2, 2],
[0, 1, 0],
[1, 3, 1],
[0, 4, 1],
[2, 4, 2],
[3, 3, 1]])
>>> idx = np.ran...
The modulo operation on negative numbers in Python
...
134
Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as th...