{"spec_id":"bar-error","library":"bokeh","language":"python","code":"\"\"\" anyplot.ai\nbar-error: Bar Chart with Error Bars\nLibrary: bokeh 3.9.0 | Python 3.13.13\nQuality: 84/100 | Updated: 2026-05-10\n\"\"\"\n\nimport os\nimport time\nfrom pathlib import Path\n\nimport numpy as np\nfrom bokeh.io import output_file, save\nfrom bokeh.models import ColumnDataSource, TeeHead, Whisker\nfrom bokeh.plotting import figure\nfrom selenium import webdriver\nfrom selenium.webdriver.chrome.options import Options\n\n\n# Theme tokens\nTHEME = os.getenv(\"ANYPLOT_THEME\", \"light\")\nPAGE_BG = \"#FAF8F1\" if THEME == \"light\" else \"#1A1A17\"\nELEVATED_BG = \"#FFFDF6\" if THEME == \"light\" else \"#242420\"\nINK = \"#1A1A17\" if THEME == \"light\" else \"#F0EFE8\"\nINK_SOFT = \"#4A4A44\" if THEME == \"light\" else \"#B8B7B0\"\nBRAND = \"#009E73\"  # Okabe-Ito position 1\n\n# Data - Quarterly revenue by product line with standard deviation\nnp.random.seed(42)\ncategories = [\"Electronics\", \"Clothing\", \"Home & Garden\", \"Sports\", \"Books\"]\nvalues = np.array([85.2, 62.8, 48.5, 71.3, 35.7])\nerrors = np.array([8.5, 5.2, 6.8, 9.1, 4.2])\n\n# Calculate upper and lower bounds\nupper = values + errors\nlower = values - errors\n\n# Create ColumnDataSource\nsource = ColumnDataSource(data={\"categories\": categories, \"values\": values, \"upper\": upper, \"lower\": lower})\n\n# Create figure\np = figure(\n    x_range=categories,\n    width=4800,\n    height=2700,\n    title=\"bar-error · bokeh · anyplot.ai\",\n    x_axis_label=\"Product Category\",\n    y_axis_label=\"Quarterly Revenue ($ millions)\",\n    toolbar_location=None,\n)\n\n# Draw bars\np.vbar(\n    x=\"categories\",\n    top=\"values\",\n    width=0.6,\n    source=source,\n    fill_color=BRAND,\n    line_color=BRAND,\n    line_width=3,\n    fill_alpha=0.85,\n)\n\n# Add error bars with whiskers and caps\nwhisker = Whisker(\n    source=source,\n    base=\"categories\",\n    upper=\"upper\",\n    lower=\"lower\",\n    line_color=INK_SOFT,\n    line_width=5,\n    upper_head=TeeHead(size=40, line_color=INK_SOFT, line_width=5),\n    lower_head=TeeHead(size=40, line_color=INK_SOFT, line_width=5),\n)\np.add_layout(whisker)\n\n# Style\np.title.text_font_size = \"28pt\"\np.title.text_color = INK\np.xaxis.axis_label_text_font_size = \"22pt\"\np.yaxis.axis_label_text_font_size = \"22pt\"\np.xaxis.major_label_text_font_size = \"18pt\"\np.yaxis.major_label_text_font_size = \"18pt\"\np.xaxis.axis_label_text_color = INK\np.yaxis.axis_label_text_color = INK\np.xaxis.major_label_text_color = INK_SOFT\np.yaxis.major_label_text_color = INK_SOFT\n\n# Axis styling\np.xaxis.axis_line_color = INK_SOFT\np.yaxis.axis_line_color = INK_SOFT\np.xaxis.axis_line_width = 2\np.yaxis.axis_line_width = 2\np.xaxis.major_tick_line_color = INK_SOFT\np.yaxis.major_tick_line_color = INK_SOFT\np.xaxis.major_tick_line_width = 2\np.yaxis.major_tick_line_width = 2\n\n# Grid\np.xgrid.visible = False\np.ygrid.grid_line_color = INK_SOFT\np.ygrid.grid_line_alpha = 0.10\np.ygrid.grid_line_width = 1\n\n# Background\np.background_fill_color = PAGE_BG\np.border_fill_color = PAGE_BG\np.outline_line_color = INK_SOFT\n\n# Y-axis range\np.y_range.start = 0\np.y_range.end = max(upper) + 15\n\n# Save HTML\noutput_file(f\"plot-{THEME}.html\")\nsave(p)\n\n# Screenshot with headless Chrome\nW, H = 4800, 2700\nopts = Options()\nfor arg in (\n    \"--headless=new\",\n    \"--no-sandbox\",\n    \"--disable-dev-shm-usage\",\n    \"--disable-gpu\",\n    f\"--window-size={W},{H}\",\n    \"--hide-scrollbars\",\n):\n    opts.add_argument(arg)\ndriver = webdriver.Chrome(options=opts)\ndriver.set_window_size(W, H)\ndriver.get(f\"file://{Path(f'plot-{THEME}.html').resolve()}\")\ntime.sleep(3)\ndriver.save_screenshot(f\"plot-{THEME}.png\")\ndriver.quit()\n"}