大约有 47,000 项符合查询结果（耗时：0.0434秒） [XML]
Count occurrences of a char in a string using Bash
...
I would use the following awk command:
string="text,text,text,text"
char=","
awk -F"${char}" '{print NF-1}' <<< "${string}"
I'm splitting the string by $char and print the number of resulting fields minus 1.
If your shell does not support the <...
How to find the installed pandas version
I am having trouble with some of pandas functionalities. How do I check what is my installation version?
6 Answers
...
Automatically import modules when entering the python or ipython interpreter
... documentation:
If this is the name of a readable file, the Python commands in that
file are executed before the first prompt is displayed in interactive
mode. The file is executed in the same namespace where interactive
commands are executed so that objects defined or imported in it can b...
How to convert a char array back to a string?
...
No, that solution is absolutely correct and very minimal.
Note however, that this is a very unusual situation: Because String is handled specially in Java, even "foo" is actually a String. So the need for splitting a String into individual chars and join them bac...
Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
I guess I'm not clear on how to do "and" tests. I wanted to make sure an argument existed which was working well with [ -e $VAR ] , but it turns out that was also evaluating as true on an empty string; which I do not want.
...
NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]
...liable information on when to use this. So I pose the following questions, and I'm sorry if these are really dumb questions in advance:
...
Add a new element to an array without specifying the index in Bash
...mb Guy points out, it's important to note whether the array starts at zero and is sequential. Since you can make assignments to and unset non-contiguous indices ${#array[@]} is not always the next item at the end of the array.
$ array=(a b c d e f g h)
$ array[42]="i"
$ unset array[2]
$ unset array...
Why does C++ not have reflection?
This is a somewhat bizarre question. My objectives are to understand the language design decision and to identify the possibilities of reflection in C++.
...
How to convert unix timestamp to calendar date moment.js
I have a unix timestamp, and I'm trying to convert it into a calendar date such as MM/DD/YYYY .
So far, I have this:
11 A...
Superscript in markdown (Github flavored)?
... to write O(n^2) sensibly, I would just type O(n<sup>2</sup>), and it would appear as O(n<sup>2</sup>). Nice. Now why didn't that work on SO markdown?
– phonetagger
Apr 2 '15 at 17:19
...