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解决Scrapy警告:You do not have a working installation of the service_i...
...e_identity-17.0.0-py2.py3-none-any.whl
如果上面的方法没能解决问题，很大可能是有些包的版本不一样导致的，这个时候我们可以用下面这行代码来强制更新：
pip install service_identity --force --upgrade
至此，问题解决。
?: operator (the 'Elvis operator') in PHP
I saw this today in some PHP code:
5 Answers
5
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How to remove duplicate values from a multi-dimensional array in PHP
How can I remove duplicate values from a multi-dimensional array in PHP?
19 Answers
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How to check that an object is empty in PHP?
How to find if an object is empty or not in PHP.
11 Answers
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getenv() vs. $_ENV in PHP
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According to the php documentation about getenv, they are exactly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation...
PHP - how to best determine if the current invocation is from CLI or web server?
I need to determine whether the current invocation of PHP is from the command line (CLI) or from the web server (in my case, Apache with mod_php).
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PHP + curl, HTTP POST sample code?
Can anyone show me how to do a php curl with an HTTP POST?
11 Answers
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PHP array: count or sizeof?
To find the number of elements in a PHP $array , which is faster/better/stronger?
7 Answers
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How can I create an error 404 in PHP?
My .htaccess redirects all requests to /word_here to /page.php?name=word_here . The PHP script then checks if the requested page is in its array of pages.
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NOW() function in PHP
Is there a PHP function that returns the date and time in the same format as the MySQL function NOW() ?
20 Answers
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