大约有 15,569 项符合查询结果（耗时：0.0163秒） [XML]
An error occurred while installing pg (0.17.1), and Bundler cannot continue
...
Some kind of error resported here Installing PG gem on OS X - failure to build native extension
To install dependencies on Ubuntu try this:
sudo apt-get install libpq-dev
and this
gem install pg
...
e.printStackTrace equivalent in python
...happened!")
# will print this message followed by traceback
Output:
ERROR 2007-09-18 23:30:19,913 error 1294 Something awful happened!
Traceback (most recent call last):
File "b.py", line 22, in f
g()
File "b.py", line 14, in g
1/0
ZeroDivisionError: integer division or modulo by ...
Is there a simple way to convert C++ enum to string?
... I could not get this to compile in VS2015. I get a warning and an error: warning: multi-line comment [-Wcomment] #define MAKE_ENUM(name, ...) enum class name { VA_ARGS, __COUNT} error: stray '#' in program std*: string enumName = #name
– C...
AJAX post error : Refused to set unsafe header “Connection”
... to a PHP file. Everytime the post of data happens I get the following two errors :
1 Answer
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MySQL Cannot Add Foreign Key Constraint
...t time or two on different tables, but I have two tables on which I get an error when trying to add the Foreign Key Constraints.
The error message that I get is:
...
src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
...
I installed the two libraries, and still got the error. Logged off and back on, and still got the error. The make file is looking in /usr/include for libxml, but that is nested inside a libxml2 directory. Linking to libxml from /usr/include did the trick sudo ln -s libxm...
In Python, how do I indicate I'm overriding a method?
...'hello kitty!'
and if you do a faulty version it will raise an assertion error during class loading:
class ConcreteFaultyImplementer(MySuperInterface):
@overrides(MySuperInterface)
def your_method(self):
print 'bye bye!'
>> AssertionError!!!!!!!
...
What is the difference between float and double?
...og(10) = 7.22 digits
This precision loss could lead to greater truncation errors being accumulated when repeated calculations are done, e.g.
float a = 1.f / 81;
float b = 0;
for (int i = 0; i < 729; ++ i)
b += a;
printf("%.7g\n", b); // prints 9.000023
while
double a = 1.0 / 81;
double b = ...
When converting a project to use ARC what does “switch case is in protected scope” mean?
...sing Xcode 4 Edit -> Refactor -> Convert to Objective-C ARC...
One of the errors I get is "switch case is in protected scope" on "some" of the switches in a switch case.
...
Adding gif image in an ImageView in android
...static final int STATUS_OK = 0;
public static final int STATUS_FORMAT_ERROR = 1;
public static final int STATUS_OPEN_ERROR = 2;
protected static final int MAX_STACK_SIZE = 4096;
protected InputStream in;
protected int status;
protected int width; // full image width
pr...