大约有 47,000 项符合查询结果（耗时：0.0464秒） [XML]
Regex group capture in R with multiple capture-groups
...
118
str_match(), from the stringr package, will do this. It returns a character matrix with one co...
How to check if a string is a valid hex color representation?
...d support for 3-character HEX codes, use the following:
/^#([0-9A-F]{3}){1,2}$/i.test('#ABC')
The only difference here is that
[0-9A-F]{6}
is replaced with
([0-9A-F]{3}){1,2}
This means that instead of matching exactly 6 characters, it will match exactly 3 characters, but 1 or 2 times. Al...
What is the most pythonic way to check if an object is a number?
...
14 Answers
14
Active
...
Selecting with complex criteria from pandas.DataFrame
...; from random import randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 90...
Remove insignificant trailing zeros from a number?
...
15 Answers
15
Active
...
How do I get indices of N maximum values in a NumPy array?
...
16 Answers
16
Active
...
Using async/await for multiple tasks
...
591
int[] ids = new[] { 1, 2, 3, 4, 5 };
Parallel.ForEach(ids, i => DoSomething(1, i, blogClient)...
How to validate IP address in Python? [duplicate]
...
11 Answers
11
Active
...
How to convert a boolean array to an int array
...
176
Numpy arrays have an astype method. Just do y.astype(int).
Note that it might not even be ne...
What does “fragment” mean in ANTLR?
...
113
A fragment is somewhat akin to an inline function: It makes the grammar more readable and easi...