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Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Warning: Trying to access array offset on value of type null in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/typecho/usr/plugins/MarkdownParse/ParsedownExtra.php on line 225

python中常见的逻辑运算字符：

and     #与
or      #或
not     #非
!=      #不等于
==      #等于