大约有 47,000 项符合查询结果（耗时：0.0655秒） [XML]
What does axis in pandas mean?
...0 along the rows (namely, index in pandas), and axis=1 along the columns. For added clarity, one may choose to specify axis='index' (instead of axis=0) or axis='columns' (instead of axis=1).
+------------+---------+--------+
| | A | B |
+------------+---------+---------
| ...
The forked VM terminated without saying properly goodbye. VM crash or System.exit called
...lease help me to solve this issue. I do not exactly understand what the error in the log means.
48 Answers
...
Retain precision with double in Java
... primitive types in Java are floating point numbers, where the number is stored as a binary representation of a fraction and a exponent.
More specifically, a double-precision floating point value such as the double type is a 64-bit value, where:
1 bit denotes the sign (positive or negative).
11 b...
Webrick as production server vs. Thin or Unicorn?
It seems like it's taken for granted that you must not use Webrick as production server, but I can't really find anywhere mentioning why. The consensus seems to be:
"Webrick is ok for development, but Thin or Unicorn is the choice for production, period."
...
What's the difference between eval, exec, and compile?
...
The short answer, or TL;DR
Basically, eval is used to evaluate a single dynamically generated Python expression, and exec is used to execute dynamically generated Python code only for its side effects.
eval and exec have these tw...
How can I remove a character from a string using Javascript?
...o do is remove the character r from a string.
The problem is, there is more than one instance of r in the string.
However, it is always the character at index 4 (so the 5th character).
...
What is the JavaScript convention for no operation?
What is the JavaScript convention for no operation? Like a Python pass command.
6 Answers
...
bash: mkvirtualenv: command not found
...
Solution 1:
For some reason, virtualenvwrapper.sh installed in /usr/bin/virtualenvwrapper.sh, instead of under /usr/local/bin.
The following in my .bash_profile works...
source "/usr/bin/virtualenvwrapper.sh"
export WORKON_HOME="/opt/vi...
MySQL show status - active or total connections?
...ch is 9972 and constantly growing. Is this an active number of connections or connections made in total?
8 Answers
...
RegEx to find two or more consecutive chars
I need to determine if a string contains two or more consecutive alpha chars. Two or more [a-zA-Z] side by side.
Example:
...