大约有 42,000 项符合查询结果（耗时：0.0529秒） [XML]
Postgres - FATAL: database files are incompatible with server
...
413
If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your pos...
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...
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 {...
Remove all special characters, punctuation and spaces from string
...
378
This can be done without regex:
>>> string = "Special $#! characters spaces 888323...
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...
Reading a binary file with python
...
|
edited Jan 3 '12 at 11:15
answered Jan 3 '12 at 10:46
...
How to abandon a hg merge?
...iscard uncommitted changes with the -C (or --clean) flag:
hg update -C -r 3
BEWARE: Everything that was not committed will be gone!
After that you should probably use some kind of code formatter tool to do the entire operation, or at least some find and replace with regular expressions. Somethin...