{"id":19200,"date":"2022-11-05T20:11:52","date_gmt":"2022-11-05T14:41:52","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-recieve-global-variable-cython\/"},"modified":"2022-11-05T20:11:52","modified_gmt":"2022-11-05T14:41:52","slug":"solved-recieve-global-variable-cython","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-recieve-global-variable-cython\/","title":{"rendered":"[Solved] Recieve global variable (Cython)"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-46224631\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"46224631\" data-parentid=\"46223278\" data-score=\"7\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>In an <code>Ipython<\/code> session I can do:<\/p>\n<pre><code>In [2]: %load_ext Cython\nIn [3]: one = 1\nIn [4]: %%cython\n   ...: def foo(num):\n   ...:    return num + 1\n   ...: \nIn [5]: foo(one)\nOut[5]: 2\n<\/code><\/pre>\n<p>That is I define a <code>cython<\/code> function, but call it from Python with the global variable.<\/p>\n<p>If I define the function with <code>cdef<\/code> I need to invoke it with a <code>def<\/code> function.  <code>fooc<\/code> is not visible from Python.<\/p>\n<pre><code>In [9]: %%cython\n   ...: cdef fooc(num):\n   ...:    return num + 2\n   ...: def foo_call(num):\n   ...:    return fooc(num)\n   ...: \nIn [10]: foo_call(one)\nOut[10]: 3\n<\/code><\/pre>\n<p>If I attempt to use <code>one<\/code> from within the <code>cython<\/code> file (magic cell) I get an error, the equivalent of a Python NameError<\/p>\n<pre><code>In [8]: %%cython\n   ...: cdef fooc(num):\n   ...:    return num + 2\n   ...: print(fooc(one))\n   ...: \n\nError compiling Cython file:\n...\n\/home\/paul\/.cache\/ipython\/cython\/....: undeclared name not builtin: one\n<\/code><\/pre>\n<p>The <code>ipython<\/code> session variable <code>one<\/code> is not visible from within the magic cell.<\/p>\n<hr>\n<p>Working from @DavidW&#8217;s answer, this <code>import<\/code> works:<\/p>\n<pre><code>In [14]: %%cython\n    ...: from __main__ import one\n    ...: cdef fooc(num):\n    ...:    return num + 2\n    ...: print(fooc(one))\n    ...: \n3\n<\/code><\/pre>\n<p>This <code>fooc<\/code> is not accessible from Python.<\/p>\n<p>Note that the <code>import<\/code> uses the value of <code>one<\/code> at compile time. <\/p>\n<pre><code>In [22]: %%cython\n    ...: from __main__ import one\n    ...: cdef fooc(num):\n    ...:    return num + 20\n    ...: def fooc_call():\n    ...:    print(fooc(one))\n    ...: \n    ...: \nIn [23]: fooc_call()\n21\nIn [24]: one=343           # new value\nIn [25]: fooc_call()        # no change\n21\nIn [26]: foo_call(one)     # uses the current value\nOut[26]: 345\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Recieve global variable (Cython) <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] In an Ipython session I can do: In [2]: %load_ext Cython In [3]: one = 1 In [4]: %%cython &#8230;: def foo(num): &#8230;: return num + 1 &#8230;: In [5]: foo(one) Out[5]: 2 That is I define a cython function, but call it from Python with the global variable. If I define the function &#8230; <a title=\"[Solved] Recieve global variable (Cython)\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-recieve-global-variable-cython\/\" aria-label=\"More on [Solved] Recieve global variable (Cython)\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[3326,349],"class_list":["post-19200","post","type-post","status-publish","format-standard","hentry","category-solved","tag-cython","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Recieve global variable (Cython) - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-recieve-global-variable-cython\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Recieve global variable (Cython) - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] In an Ipython session I can do: In [2]: %load_ext Cython In [3]: one = 1 In [4]: %%cython ...: def foo(num): ...: return num + 1 ...: In [5]: foo(one) Out[5]: 2 That is I define a cython function, but call it from Python with the global variable. 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