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Test if a command outputs an empty string
...ll do something like this:
run a command
buffer its entire output in RAM
convert the output into a huge single-line string
compare that string to an empty string
What I would suggest doing instead would be:
run a command
count the characters in its output without storing them
or even better ...
How to convert R Markdown to PDF?
I've previously asked about the commands for converting R Markdown to HTML .
8 Answers
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How do you read from stdin?
...t fallsback to stdin: "This iterates over the lines of all files listed in sys.argv[1:], defaulting to sys.stdin if the list is empty. If a filename is '-', it is also replaced by sys.stdin. To specify an alternative list of filenames, pass it as the first argument to input(). A single file name is ...
How can I quantify difference between two images?
...e same size and shape, possibly with different exposure. For simplicity, I convert them to grayscale even if they are color (RGB) images.
You will need these imports:
import sys
from scipy.misc import imread
from scipy.linalg import norm
from scipy import sum, average
Main function, read two im...
Where is Python's sys.path initialized from?
Where is Python's sys.path initialized from?
2 Answers
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libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
..._init()初始化libcurl
2. 调用 curl_easy_init()函数得到 easy interface型指针
3. 调用curl_easy_setopt设置传输选项
4. 根据curl_easy_setopt设置的传输选项，实现回调函数以完成用户特定任务
5. 调用curl_easy_perform（）函数完成...
sys.argv[1] meaning in script
...wondering (In reference to my example below) in simplified terms what the sys.argv[1] represents. Is it simply asking for an input?
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How many socket connections can a web server handle?
...13/the-secret-to-10-million-concurrent-connections-the-kernel-i.html, goes into a lot of detail, exploring how even 10 million could be achieved. Servers often have hardware TCP offload engines, ASICs designed for this specific role more efficiently than a general purpose CPU.
Good software design c...
How to find out if a Python object is a string?
...to_test, str)
This follows the fix of the official 2to3 conversion tool: converting basestring to str.
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Determine if Python is running inside virtualenv
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The most reliable way to check for this is to check whether sys.prefix == sys.base_prefix. If they are equal, you are not in a virtual environment; if they are unequal, you are. Inside a virtual environment, sys.prefix points to the virtual environment, and sys.base_prefix is the pref...