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What are dictionary view objects?
...e a window on the keys and values (or items) of a dictionary. Here is an excerpt from the official documentation for Python 3:
>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}
>>> keys = dishes.keys()
>>> values = dishes.values()
>>> # view obje...
What is the difference between And and AndAlso in VB.NET?
...ndAlso evaluates the right side if and only if the left side is true.
An example:
If mystring IsNot Nothing And mystring.Contains("Foo") Then
' bla bla
End If
The above throws an exception if mystring = Nothing
If mystring IsNot Nothing AndAlso mystring.Contains("Foo") Then
' bla bla
End If...
How to validate phone numbers using regex
I'm trying to put together a comprehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following:
...
Python pandas: fill a dataframe row by row
...'y'] will set a column
since you want to set a row, use .loc
Note that .ix is equivalent here, yours failed because you tried to assign a dictionary
to each element of the row y probably not what you want; converting to a Series tells pandas
that you want to align the input (for example you then d...
Is it intended by the C++ standards committee that in C++11 unordered_map destroys what it inserts?
...ur, you observe, which always moves, is a bug in libstdc++, which is now fixed according to a comment on the question. For those curious, I took a look at the g++-4.8 headers.
bits/stl_map.h, lines 598-603
template<typename _Pair, typename = typename
std::enable_if<std::is_const...
Using headers with the Python requests library's get method
...uests in Python; found here http://docs.python-requests.org/en/latest/index.html .
3 Answers
...
How to read a single character from the user?
...nk to a site that says how you can read a single character in Windows, Linux and OSX: http://code.activestate.com/recipes/134892/
class _Getch:
"""Gets a single character from standard input. Does not echo to the
screen."""
def __init__(self):
try:
self.impl = _GetchWin...
How can building a heap be O(n) time complexity?
Can someone help explain how can building a heap be O(n) complexity?
17 Answers
17
...
Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined [
...mple Google App Engine Web Application Project on Eclipse Kepler on Mac OS X with java version "1.7.0_45"
2 Answers
...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...酷的。”
6、Keyboard not found ... press F1 to continue
7、Unix是用户友好的，只是要成为Unix的用户很困难。
8、一百万只猴子，给他们一百万个键盘，其中的一个会写出Java程序，其它的写的都是Perl程序。
9、程序员给孩子取名...