大约有 45,000 项符合查询结果（耗时：0.0563秒） [XML]
Difference: std::runtime_error vs std::exception()
...
std::runtime_error on the other hand has valid constructors that accept a string as a message. When what() is called a const char pointer is returned that points at a C string that has the same string as was passed into the constructor.
try
{
if (badThingHappened)
{
throw std::run...
What's the difference between eval, exec, and compile?
... call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
a = 47
^
SyntaxError: invalid syntax
The compile in 'exec' mode compiles any number of statements into a bytecode that implicitly always returns None, whereas in 'eval' mode it compiles a sin...
How can I convert JSON to CSV?
... is as easy as using two commands!
pandas.read_json()
To convert a JSON string to a pandas object (either a series or dataframe). Then, assuming the results were stored as df:
df.to_csv()
Which can either return a string or write directly to a csv-file.
Based on the verbosity of previous ans...
Rails migrations: self.up and self.down versus change
...d only delete this column on down
def up
add_column :users, :location, :string
User.update_all(location: 'Minsk')
end
def down
remove_column :users, :location
end
But:
You had to avoid using change method which allows to save some time. For example, if you didn’t need to update column v...
Using -performSelector: vs. just calling the method
...s explained in a previous answer. For example
SEL method = NSSelectorFromString([NSString stringWithFormat:@"doSomethingWithMy%@:", @"Age");
[object performSelector:method];
The other use, is to asynchronously dispatch a message to object, that will be executed later on the current runloop. For ...
how to set textbox value in jquery
...ject. By default an object is converted to [object Object] when treated as string.
Further clarification:
Assuming your URL returns 5.
If your HTML looks like:
<div id="foo"></div>
then the result of
$('#foo').load('/your/url');
will be
<div id="foo">5</div>
Bu...
Git workflow and rebase vs merge questions
...hanges across files and have to resolve that multiple times.
With all the extra conflict resolution you need to do, it just increases the possibility that you will make a mistake. But mistakes are fine in git since you can undo, right? Except of course...
Reason #2: With rebase, there is no undo!
...
How do I look inside a Python object?
...
the best way to see object and its contents in a string
– Peter Krauss
Dec 28 '19 at 21:57
T...
How to read a .xlsx file using the pandas Library in iPython?
...xcel table into a pandas DataFrame
Parameters
----------
io : string, path object (pathlib.Path or py._path.local.LocalPath),
file-like object, pandas ExcelFile, or xlrd workbook.
The string could be a URL. Valid URL schemes include http, ftp, s3,
and file. For f...
Using “like” wildcard in prepared statement
...
You need to set it in the value itself, not in the prepared statement SQL string.
So, this should do for a prefix-match:
notes = notes
.replace("!", "!!")
.replace("%", "!%")
.replace("_", "!_")
.replace("[", "![");
PreparedStatement pstmt = con.prepareStatement(
"SELECT ...