大约有 48,000 项符合查询结果（耗时：0.0605秒） [XML]
Reference — What does this symbol mean in PHP?
...is a byte? A byte is made up of 8 bits and the highest value of a byte is 255, which would mean every bit is set. We will look at why a byte's maximum value is 255.
-------------------------------------------
| 1 Byte ( 8 bits ) |
-------------------------------------------
|P...
Remove duplicated rows using dplyr
...|
edited Jun 19 '18 at 12:57
Axeman
25.5k66 gold badges6363 silver badges7171 bronze badges
answered Apr...
How can I brew link a specific version?
...
5 Answers
5
Active
...
Scala: what is the best way to append an element to an Array?
...
stefanobaghino
7,94333 gold badges2525 silver badges4848 bronze badges
answered Sep 21 '11 at 12:57
tenshitenshi
...
Regex to replace everything except numbers and a decimal point
...parseFloat. That will remove additional decimal points. e.g. parseFloat("46554.4655465.54654.545345.5") = 46554.4655465
– Simon
Dec 6 '16 at 3:57
...
Using bitwise OR 0 to floor a number
...
answered Sep 20 '11 at 15:54
JoeJoe
70.8k1717 gold badges121121 silver badges139139 bronze badges
...
?: operator (the 'Elvis operator') in PHP
...
5 Answers
5
Active
...
show all tags in git log
...have the following situation (assuming that it points at some commit)
35805ce <--- 5b7b4ead <=== refs/tags/A
(commit) tag A
(tag)
Please also note that "git tag -f A A" (notice the absence of options forcing it to be an annotated tag) is a noop - it doesn't...
What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...lues,index=df.Position).to_dict()
Out[9]: {1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e'}
Speed comparion (using Wouter's method)
In [6]: df = pd.DataFrame(randint(0,10,10000).reshape(5000,2),columns=list('AB'))
In [7]: %timeit dict(zip(df.A,df.B))
1000 loops, best of 3: 1.27 ms per loop
In [8]: %time...