大约有 6,887 项符合查询结果（耗时：0.0174秒） [XML]
How do I find numeric columns in Pandas?
...mn in pandas data frame,
numeric_clmns = df.dtypes[df.dtypes != "object"].index
share
|
improve this answer
|
follow
|
...
Rename a file using Java
...following is copied directly from http://docs.oracle.com/javase/7/docs/api/index.html:
Suppose we want to rename a file to "newname", keeping the file in the same directory:
Path source = Paths.get("path/here");
Files.move(source, source.resolveSibling("newname"));
Alternatively, suppose we want to...
How can I create an error 404 in PHP?
...ake over:
<?php
if(condition){
do stuff;
} else {
include('index.php');
}
?>
share
|
improve this answer
|
follow
|
...
How do I get the RootViewController from a pushed controller?
...ntrollers;
UIViewController *rootViewController = [viewControllers objectAtIndex:viewControllers.count - 2];
This is the standard way of getting the "back" view controller. The reason objectAtIndex:0 works is because the view controller you're trying to access is also the root one, if you were dee...
Difference between and
... while the named input name=submit1 WILL get submitted.
Sample HTML form (index.html):
<form action="checkout.php" method="POST">
<!-- this won't get submitted despite being named -->
<input type="button" name="button1" value="a button">
<!-- this one does; so the inpu...
Using $_POST to get select option value from HTML
...
Like this:
<?php
$option = $_POST['taskOption'];
?>
The index of the $_POST array is always based on the value of the name attribute of any HTML input.
share
|
improve this answer...
Arrays vs Vectors: Introductory Similarities and Differences [closed]
...age construct;
come almost unmodified from C89;
provide just a contiguous, indexable sequence of elements; no bells and whistles;
are of fixed size; you can't resize an array in C++ (unless it's an array of POD and it's allocated with malloc);
their size must be a compile-time constant unless they a...
How do I rename a column in a database table using SQL?
...N MyOldColumn;
For the very simplest of cases (no constraints, triggers, indexes or keys), it will take the above 3 lines. For anything more complicated it can get very messy as you fill in the missing parts.
However, as mentioned above, there are simpler database specific methods if you know whi...
Recommended method for escaping HTML in Java
... documents (http://commons.apache.org/proper/commons-lang/javadocs/api-3.0/index.html). So to escape HTML version 4.0 string:
import static org.apache.commons.lang3.StringEscapeUtils.escapeHtml4;
String output = escapeHtml4("The less than sign (<) and ampersand (&) must be escaped before us...
Getting Java version at runtime
...major version: If it is a 1.x.y_z version string, extract the character at index 2 of the string. If it is a x.y.z version string, cut the string to its first dot character, if one exists.
private static int getVersion() {
String version = System.getProperty("java.version");
if(version.star...