大约有 2,500 项符合查询结果（耗时：0.0303秒） [XML]
In Python, how do you convert seconds since epoch to a `datetime` object?
...mp(timestamp) fail on windows for dates before Jan. 1, 1970 while negative unix timestamps seem to work on unix-based platforms. The docs say this:
"This may raise ValueError, if the timestamp is out of the range of
values supported by the platform C gmtime() function. It’s common for
this...
How to set environment variables in Python?
...
@Evan There might be some historical variants of Unix that don't support putenv(), but for those Unixen there is nothing you can do anyway. Even old version of AIX and HPUX I worked with did support it. If anyone is actually able to find a computer not supporting it toda...
How to check if a python module exists without importing it
...y thoughts for the ones coming after me and looking for the same:
Linux/UNIX script file method: make a file module_help.py:
#!/usr/bin/env python
help('modules')
Then make sure it's executable: chmod u+x module_help.py
And call it with a pipe to grep:
./module_help.py | grep module_nam...
Mac OSX Lion DNS lookup order [closed]
...ht still be an issue in some cases.
Make sure your /etc/hosts file is a unix style text file, with linefeeds as the ending rather than cr's.
Editing with TextWrangler or a unix text editor should preserve the file.
If your file is already messed up, try this to fix
tr '\015' '\012' < /etc...
How to obtain the number of CPUs/cores in Linux from the command line?
...ROCESSORS_CONF are not required by standards, but are provided on numerous unix platforms and documented as optional by Open Group."
– BCran
Oct 4 '15 at 20:36
...
What is the meaning of prepended double colon “::”?
...pace "tree".
Contrasting with such absolute paths, you can configure good UNIX shells (e.g. zsh) to resolve relative paths under your current directory or any element in your PATH environment variable, so if PATH=/usr/bin:/usr/local/bin, and you were "in" /tmp, then...
X11/xterm
...would happily...
What is the proper #include for the function 'sleep()'?
...
sleep is a non-standard function.
On UNIX, you shall include <unistd.h>.
On MS-Windows, Sleep is rather from <windows.h>.
In every case, check the documentation.
share
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Why is argc not a constant?
...y with (a good portion of) existing C code was an early goal of C++.
Some UNIX APIs, such as getopt, actually do manipulate argv[], so it can't be made const for that reason also.
(Aside: Interestingly, although getopt's prototype suggests it won't modify argv[] but may modify the strings pointe...
What is the difference between gmake and make?
... make implementation; on most Linux distros this is GNU make, but on other unixes, it could refer to some other implementation of make, such as BSD make, or the make implementations of various commercial unixes.
The language accepted by GNU make is a superset of the one supported by the traditional...
What are good grep tools for Windows? [closed]
...t's the beef? Several other GREP tools for Windows are just as free as for unix/linux. Indeed, this is what I love about the Windows ecosystem -- lots of free, if that's your main criterion, AND the ecosystem often supports paying developers for exploring extended amounts of functionality, such as w...