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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...
iOS开发过程中的各种tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...) withObject:self afterDelay:1.0];
35.用NSDateFormatter调整时间格式代码
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];
36.UIView设置成圆角...
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
...
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...
How do I get a UTC Timestamp in JavaScript?
...)
Note that getTime() returns milliseconds, not plain seconds.
For a UTC/Unix timestamp, the following should suffice:
Math.floor((new Date()).getTime() / 1000)
It will factor the current timezone offset into the result. For a string representation, David Ellis' answer works.
To clarify:
new ...