大约有 44,000 项符合查询结果（耗时：0.0870秒） [XML]
How to restore the permissions of files and directories within git if they have been modified?
I have a git checkout. All the file permissions are different than what git thinks they should be therefore they all show up as modified.
...
Cannot set some HTTP headers when using System.Net.WebRequest
...
If you need the short and technical answer go right to the last section of the answer.
If you want to know better, read it all, and i hope you'll enjoy...
I countered this problem too today, and what i discovered today is...
Replace a value in a data frame based on a conditional (`if`) statement
... <- as.character(junk$nm)
junk$nm[junk$nm == "B"] <- "b"
EDIT: And if indeed you need to maintain nm as factors, add this in the end:
junk$nm <- as.factor(junk$nm)
share
|
improve this ...
LEFT JOIN vs. LEFT OUTER JOIN in SQL Server
What is the difference between LEFT JOIN and LEFT OUTER JOIN ?
12 Answers
12
...
CSS hide scroll bar if not needed
I am trying to figure out how I can hide the overflow-y:scroll; if not needed. What I mean is that I am building a website and I have a main area which posts will be displayed and I want to hide the scroll bar if content does not exceed the current width.
...
htmlentities() vs. htmlspecialchars()
What are the differences between htmlspecialchars() and htmlentities() . When should I use one or the other?
12 Answers
...
How to read a line from the console in C?
...0), * linep = line;
size_t lenmax = 100, len = lenmax;
int c;
if(line == NULL)
return NULL;
for(;;) {
c = fgetc(stdin);
if(c == EOF)
break;
if(--len == 0) {
len = lenmax;
char * linen = realloc(linep, lenmax *= 2)...
How to loop through a directory recursively to delete files with certain extensions
...or loop, instead of using xargs. I often find xargs cumbersome, especially if I need to do something more complicated in each iteration.
for f in $(find /tmp -name '*.pdf' -or -name '*.doc'); do rm $f; done
As a number of people have commented, this will fail if there are spaces in filenames. You...
What is the “volatile” keyword used for?
...The compiler will then avoid any optimisations that may result in problems if the variable changes "outside of its control".
share
|
improve this answer
|
follow
...
differentiate null=True, blank=True in django
... will be required in forms. This includes the admin and your custom forms. If blank=True then the field will not be required, whereas if it's False the field cannot be blank.
The combo of the two is so frequent because typically if you're going to allow a field to be blank in your form, you're goin...