大约有 42,000 项符合查询结果（耗时：0.0455秒） [XML]
What is float in Java?
...
In Java, when you type a decimal number as 3.6, its interpreted as a double. double is a 64-bit precision IEEE 754 floating point, while floatis a 32-bit precision IEEE 754 floating point. As a float is less precise than a double, the conversion cannot be performed i...
Python extending with - using super() Python 3 vs Python 2
...
super() (without arguments) was introduced in Python 3 (along with __class__):
super() -> same as super(__class__, self)
so that would be the Python 2 equivalent for new-style classes:
super(CurrentClass, self)
for old-style classes you can always use:
class Classname...
Remove all special characters, punctuation and spaces from string
...
378
This can be done without regex:
>>> string = "Special $#! characters spaces 888323...
Any way to properly pretty-print ordered dictionaries?
...
133
As a temporary workaround you can try dumping in JSON format.
You lose some type information, b...
What are all the uses of an underscore in Scala?
...](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ => println("Hi") }
Ignored names of self types
trait MySeq { _: Seq[_] => }
Wildcard patterns
Some(5) match { case Some(_) => println("Yes") }
Wildcard patterns in interpolations
"abc" match {...
What is “entropy and information gain”?
...# ------------------------------------------------
Ashley 1 3 6 f
Brian 0 2 5 m
Caroline 1 4 8 f
David 0 2 5 m
The goal is to build a decision tree. An example of a tree ...
App Inventor 2 数学代码块 · App Inventor 2 中文网
... ( ^ )
返回第一个数字的第二个数字次幂的结果。比如2^3 = 222 = 8
随机整数 (random integer)
返回给定值之间（包含首尾）的随机整数值。参数的顺序不限，也就是 1~100 和 100~1 效果一样。
随机小数 (random fraction)
返回 0 到 1 ...
Pandas conditional creation of a series/dataframe column
...s
Set Type color
0 Z A green
1 Z B green
2 X B red
3 Y C red
If you have more than two conditions then use np.select. For example, if you want color to be
yellow when (df['Set'] == 'Z') & (df['Type'] == 'A')
otherwise blue when (df['Set'] == 'Z') & (df[...
How do I find the location of Python module sources?
...
382
For a pure python module you can find the source by looking at themodule.__file__.
The datetim...
jQuery get value of select onChange
...|
edited Aug 4 '18 at 15:53
moffeltje
3,85044 gold badges2121 silver badges4545 bronze badges
answered J...