<\/p>\n\n\n\n
class MyPlugin:\n<\/code><\/pre>\n\n\n\n<\/div><\/div>\n\n\n\n
This class is the core of the plugin<\/strong>. Everything that really matters goes through it.<\/p>\n\n\n\n💡 Tip: temporarily ignore the imports at the top of the file. You can come back to them later.<\/p>\n\n\n\n
\n\n\n\n<\/span>Identify the Essential Methods<\/span><\/h2>\n\n\n\nIn a typical QGIS plugin, three methods are especially important:<\/p>\n\n\n\n
\n__init__()<\/code> \u2192 plugin initialization<\/li>\n\n\n\ninitGui()<\/code> \u2192 creation of buttons and menus<\/li>\n\n\n\nrun()<\/code> \u2192 action triggered by the user<\/li>\n<\/ul>\n\n\n\n👉 If you understand when<\/strong> these methods are called, you already understand about 50% of how the plugin works<\/strong>.<\/p>\n\n\n\n
\n\n\n\n<\/span>Read the Code Like a Story<\/span><\/h2>\n\n\n\nTry to read the code as if it were a simple scenario:<\/p>\n\n\n\n
\n- the plugin is loaded (
__init__<\/code>),<\/li>\n\n\n\n- QGIS adds a button (
initGui<\/code>),<\/li>\n\n\n\n- the user clicks (
run<\/code>),<\/li>\n\n\n\n- the plugin does something.<\/li>\n<\/ul>\n\n\n\n
Even if some lines remain unclear, the overall logic becomes much easier to follow.<\/p>\n\n\n\n
\n\n\n\n<\/span>Accept Not Understanding Some Details<\/span><\/h2>\n\n\n\nSome elements can intentionally be ignored at the beginning:<\/p>\n\n\n\n
\n- detailed Qt signal handling,<\/li>\n\n\n\n
- advanced class parameters,<\/li>\n\n\n\n
- decorators or complex syntax.<\/li>\n<\/ul>\n\n\n\n
👉 This is not a failure\u2014it\u2019s a learning strategy<\/strong>.<\/p>\n\n\n\nYou will naturally come back to these concepts when you actually need them.<\/p>\n\n\n\n
\n\n\n\n<\/span>Modify Without Fully Understanding<\/span><\/h2>\n\n\n\nA very good exercise is to:<\/p>\n\n\n\n
\n- change a text,<\/li>\n\n\n\n
- rename a button,<\/li>\n\n\n\n
- modify a window title,<\/li>\n<\/ul>\n\n\n\n
without understanding every single line of code.<\/p>\n\n\n\n
If the result changes in QGIS, you are already making progress<\/strong>.<\/p>\n\n\n\n
\n\n\n\n<\/span>A Golden Rule for Beginners<\/span><\/h2>\n\n\n\nIf you know where<\/strong> to change something, you already know how to develop.<\/p>\n\n\n\nFull understanding will come later, through practice.<\/p>\n\n\n\n
\n\n\n\n<\/span>Conclusion<\/span><\/h2>\n\n\n\nReading QGIS plugin code is not a technical trial\u2014it is a progressive learning process<\/strong>. By adopting a focused reading approach, accepting temporary discomfort, and moving forward through small changes, you will quickly gain confidence.<\/p>\n\n\n\n👉 The most important thing is not to understand everything, but to keep moving forward<\/strong>.<\/p>\n\n\n\n
\n\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"
Reading the code of a QGIS plugin can quickly become stressful when you are new to Python. Multiple files, classes, unfamiliar methods\u2026 everything can seem complex at first glance. And yet, you don\u2019t need to understand…<\/p>\n","protected":false},"author":1,"featured_media":16330,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[3394,1377],"tags":[1758,4119,1386,4137,4234,4115,4145],"class_list":["post-16400","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pluigin-en","category-qgis-en","tag-plugin-en","tag-pyqgis-beginner","tag-qgis-en","tag-qgis-plugin-development","tag-qgis-plugin-structur","tag-qgis-plugin-tutorial","tag-qgis-python-plugin"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2026\/01\/pluginsQGISH1-1.jpg?fit=409%2C307&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p6XU0A-4gw","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/16400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/comments?post=16400"}],"version-history":[{"count":0,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/16400\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media\/16330"}],"wp:attachment":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media?parent=16400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/categories?post=16400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/tags?post=16400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}