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=<\/p>\n
The main advantages are that it makes multi-line lists easier to edit<\/strong><\/span> and that it reduces clutter in diffs<\/strong><\/span>.<\/p>\n =<\/p>\n It’s a common syntactical convention to allow trailing commas in an array, languages like C and Java allow it, and Python seems to have adopted this convention for its list data structure. It’s particularly useful when generating code for populating a list: just generate a sequence of elements and commas, no need to consider the last one as an special case that doesn’t have a comma at the end.<\/p>\n ==<\/p>\n Python newbies often have some confusion about how to make one-element tuples.\u00a0VenkataSubramanian<\/a>\u00a0provided a nice summary of Python’s tuple syntax\u00a0[1]<\/a>.<\/p>\n Zero Element Tuples<\/p>\n In Python, zero-element tuples look like:<\/p>\n ()<\/p>\n In this form, unlike the other tuple forms, parentheses are the essential elements, not commas.<\/p>\n One Element Tuples<\/p>\n One-element tuples look like:<\/p>\n 1,<\/p>\n The essential element here is the trailing comma. As for any expression, parentheses are optional, so you may also write one-element tuples like<\/p>\n (1,)<\/p>\n but it is the comma, not the parentheses, that define the tuple<\/span><\/strong>.<\/p>\n Multiple Element Tuples<\/p>\n In Python, multiple-element tuples look like:<\/p>\n 1,2,3<\/p>\n The essential elements are the commas between each element of the tuple.<\/span><\/strong> Multiple-element tuples may be written with a trailing comma, e.g.<\/p>\n 1,2,3,<\/p>\n but the trailing comma is completely optional<\/strong><\/span>. Just like all other expressions in Python, multiple-element tuples may be enclosed in parentheses, e.g.<\/p>\n (1,2,3)<\/p>\n or<\/p>\n (1,2,3,)<\/p>\n but again, it is the commas, not the parentheses, that define the tuple.<\/p>\n =EOF=<\/p>\n","protected":false},"excerpt":{"rendered":" \u7f18\u7531\uff1a \u5728\u770b\u4e00\u4e9bPython\u4ee3\u7801\u7684\u65f6\u5019\u4f1a\u53d1\u73b0\u6709\u4eba\u5728\u521b\u5efalist\/tuple\u7684\u65f6\u5019\u4f1a\u5728\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u540e\u9762\u6dfb\u52a0\u4e00\u4e2a& […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7],"tags":[161,8,257],"class_list":["post-2414","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-programing","tag-list","tag-python","tag-tuple"],"views":2906,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/2414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=2414"}],"version-history":[{"count":0,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/2414\/revisions"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=2414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=2414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=2414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}