{"id":254513,"date":"2026-08-26T12:02:08","date_gmt":"2026-08-26T16:02:08","guid":{"rendered":"https:\/\/ibkrcampus.com\/campus\/?p=254513"},"modified":"2026-08-27T04:41:39","modified_gmt":"2026-08-27T08:41:39","slug":"5-common-ibridgepy-mistakes-and-how-to-fix-them","status":"publish","type":"post","link":"..\/..\/..\/..\/ibkr-quant-news\/5-common-ibridgepy-mistakes-and-how-to-fix-them\/index.html","title":{"rendered":"5 Common IBridgePy Mistakes and How to Fix Them"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>The article \u201c5 Common IBridgePy Mistakes and How to Fix Them\u201d was originally published on <a href=\"https:\/\/ibridgepy.com\/blog\/5-common-ibridgepy-mistakes-and-how-to-fix-them\/\">IBridgePy<\/a> blog.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>The author of this article is not affiliated with Arclight Capital. This software is in no way affiliated, endorsed, or approved by Arclight Capital or any of its affiliates. It comes with absolutely no warranty and should not be used in actual trading unless the user can read and understand the source. The ARC API team does not support this software<\/em><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Avoid These Pitfalls in Your Python Trading Strategy<br><\/strong>After helping thousands of traders deploy\u00a0<a href=\"https:\/\/ibridgepy.com\/\">algorithmic trading<\/a>\u00a0strategies with\u00a0<a href=\"..\/..\/..\/..\/..\/index.html" target=\"_blank\" rel=\"noreferrer noopener\">Arclight Capital<\/a>, we have compiled the most common mistakes that IBridgePy users encounter. Each issue below includes the wrong approach, why it fails, and the correct solution.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mistake #1: Using time.sleep() to Wait for Order Fills<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The wrong way:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_id = order(symbol('AAPL'), 100)\ntime.sleep(5)  # Hope it fills in 5 seconds\nfill_price = get_order(order_id).avgFillPrice  # Often returns None<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why it fails:<\/strong>&nbsp;<code>time.sleep()<\/code>&nbsp;blocks the thread without processing incoming IB messages. The fill confirmation sits unprocessed in the message queue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The fix:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_id = order(symbol('AAPL'), 100)\norder_status_monitor(order_id, 'Filled', waitingTimeInSeconds=30)\nfill_price = get_order(order_id).avgFillPrice  # Always populated<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mistake #2: Placing Orders in initialize()<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The wrong way:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def initialize(context):\n    order(symbol('AAPL'), 100)  # Fails silently<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why it fails:<\/strong>&nbsp;The&nbsp;<code>initialize()<\/code>&nbsp;function runs before the connection to IB is fully established. Orders must be placed in&nbsp;<code>handle_data()<\/code>&nbsp;or in a scheduled function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The fix:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def initialize(context):\n    context.ordered = False\n\ndef handle_data(context, data):\n    if not context.ordered:\n        order(symbol('AAPL'), 100)\n        context.ordered = True<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mistake #3: Not Handling the &#8220;Filled&#8221; Status for Market Orders<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The wrong way:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_id = order(symbol('AAPL'), 100)\norder_status_monitor(order_id, 'Submitted', waitingTimeInSeconds=30)\n# Proceeds without knowing if order actually filled<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why it fails:<\/strong>\u00a0For market orders, &#8220;Submitted&#8221; means the order reached IB, not that it executed. A fast-moving market could leave your strategy in an uncertain state.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The fix:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_id = order(symbol('AAPL'), 100)\norder_status_monitor(order_id, 'Filled', waitingTimeInSeconds=30)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">For limit orders that may not fill immediately, monitor multiple statuses:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_status_monitor(order_id, ['Filled', 'Submitted'], waitingTimeInSeconds=30)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mistake #4: Using get_open_orders() to Check if a Position Was Entered<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The wrong way:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Check if my order filled\nopen_orders = get_open_orders()\nif my_order_id not in open_orders:\n    print('Must have filled!')  # Not necessarily true<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why it fails:<\/strong>&nbsp;An order can be absent from&nbsp;<code>get_open_orders()<\/code>&nbsp;for multiple reasons: it could be filled, cancelled, or rejected. Absence does not confirm a fill.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The fix:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">order_obj = get_order(my_order_id)\nif order_obj.status == 'Filled':\n    print(f'Filled at {order_obj.avgFillPrice}')\nelif order_obj.status == 'Cancelled':\n    print('Order was cancelled')<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mistake #5: Running Heavy Computation Inside handle_data()<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The wrong way:<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def handle_data(context, data):\n    # This blocks IB message processing for 30 seconds\n    result = run_ml_model_on_5000_tickers()\n    if result.signal:\n        order(symbol('AAPL'), 100)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why it fails:<\/strong>\u00a0While\u00a0<code>handle_data()<\/code>\u00a0is blocked by heavy computation, IB callbacks are not being processed. This can cause missed price updates, stale data, and connection timeouts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The fix:<\/strong>&nbsp;Pre-compute signals before market hours using&nbsp;<code>schedule_function()<\/code>, or move heavy computation to a separate process and communicate via a file or database:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def initialize(context):\n    schedule_function(compute_signals,\n                      time_rule=time_rules.spot_time(hour=9, minute=25))\n\ndef compute_signals(context):\n    # Run before market open\n    context.signal = run_ml_model_on_5000_tickers()\n\ndef handle_data(context, data):\n    if context.signal:\n        order(symbol('AAPL'), 100)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bonus: Enabling Debug Logging<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When troubleshooting any issue, enable IBridgePy&#8217;s debug output by setting the log level in your&nbsp;<code>settings.py<\/code>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">logLevel = 'DEBUG'<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This reveals the raw IB callback messages and helps identify exactly where communication breaks down.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Visit <a href=\"https:\/\/ibridgepy.com\/blog\/5-common-ibridgepy-mistakes-and-how-to-fix-them\/\">IBridgePy<\/a> blog for additional insights on this topic.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For limit orders that may not fill immediately, monitor multiple statuses.<\/p>\n","protected":false},"author":186,"featured_media":233107,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[339,343,349,338,341],"tags":[851,575,14687,595],"contributors-categories":[16524],"class_list":["post-254513","post","type-post","status-publish","format-standard","has-post-thumbnail","category-data-science","category-programing-languages","category-python-development","category-ibkr-quant-news","category-quant-development","tag-algo-trading","tag-ibkr-api","tag-ibridgepy","tag-python","contributors-categories-ibridgepy"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>5 Common IBridgePy 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