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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 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...
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 ...
Where is Python's sys.path initialized from?
Where is Python's sys.path initialized from?
2 Answers
2
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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...