大约有 40,000 项符合查询结果（耗时：0.0504秒） [XML]
Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
...tree (instead of relying of a "well known value").
Note: Git 2.25.1 (Feb. 2020) proposes in commit 9c8a294:
empty_tree=$(git mktree </dev/null)
# Windows:
git mktree <NUL
And adds:
As a historical note, the function now known as repo_read_object_file() was taught the empty tree in 3462...
lsof survival guide [closed]
...
120
To show all networking related to a given port:
lsof -iTCP -i :port
lsof -i :22
To show conn...
Select rows of a matrix that meet a condition
...
m <- matrix(1:20, ncol = 4)
colnames(m) <- letters[1:4]
The following command will select the first row of the matrix above.
subset(m, m[,4] == 16)
And this will select the last three.
subset(m, m[,4] > 17)
The result will b...
The maximum value for an int type in Go
...16 : -32768 to 32767
int32 : -2147483648 to 2147483647
int64 : -9223372036854775808 to 9223372036854775807
share
|
improve this answer
|
follow
|
...
Difference between ref and out parameters in .NET [duplicate]
...lee.
– Jesse C. Slicer
Feb 5 '10 at 20:18
3
@Mike Your correction is WRONG. It was right "and the...
Remove a folder from git tracking
...
answered May 20 '15 at 21:46
Tod BirdsallTod Birdsall
12.5k33 gold badges3131 silver badges3737 bronze badges
...
Add new row to dataframe, at specific row-index, not appended?
...ds the (often slow) rbind call:
existingDF <- as.data.frame(matrix(seq(20),nrow=5,ncol=4))
r <- 3
newrow <- seq(4)
insertRow <- function(existingDF, newrow, r) {
existingDF[seq(r+1,nrow(existingDF)+1),] <- existingDF[seq(r,nrow(existingDF)),]
existingDF[r,] <- newrow
existin...
Explicitly select items from a list or tuple
...hon 2.5.2:
19.7 usec: [ myBigList[i] for i in [87, 342, 217, 998, 500] ]
20.6 usec: map(myBigList.__getitem__, (87, 342, 217, 998, 500))
22.7 usec: itemgetter(87, 342, 217, 998, 500)(myBigList)
24.6 usec: list( myBigList[i] for i in [87, 342, 217, 998, 500] )
Note that in Python 3, the 1st was c...
Changing the width of Bootstrap popover
...
|
edited Jun 20 at 9:12
Community♦
111 silver badge
answered Mar 17 '14 at 16:29
...
Razor comment syntax
...
answered Aug 1 '10 at 20:38
BuildstartedBuildstarted
25.4k99 gold badges7979 silver badges9393 bronze badges
...