Hey there! The issue you're hitting is that PyCharm's .icls color scheme files aren't plain key-value text files—they rely on a specific XML structure the IDE needs to parse correctly. Your current file is just a flat list of assignments, which PyCharm can't interpret at all.

Let's convert your color values into the proper XML format. Here's what your hot_fudge_sunday_color_scheme.icls should look like:

<scheme name="Hot Fudge Sunday" version="142" parent="Darcula">
  <colors>
    <color name="DEFINITION_FOREGROUND" value="#D92B10"/>
    <color name="ERROR_FOREGROUND" value="#FF0000"/>
    <color name="STRING_BACKGROUND" value="#2B0F01"/>
    <color name="KEYWORD_FOREGROUND" value="#4AD231"/>
    <color name="NORMAL_FOREGROUND" value="#208008"/>
    <color name="COMMENT_BACKGROUND" value="#2B0F01"/>
    <color name="HIT_FOREGROUND" value="#208008"/>
    <color name="BUILTIN_BACKGROUND" value="#2B0F01"/>
    <color name="STDOUT_FOREGROUND" value="#D92B10"/>
    <color name="CURSOR_FOREGROUND" value="#208008"/>
    <color name="BREAK_BACKGROUND" value="#2B0F01"/>
  </colors>
  <!-- Uncomment below if you want to add font styles like bold/italic for specific elements -->
  <!--
  <attributes>
    <attribute name="KEYWORD" bold="true"/>
  </attributes>
  -->
</scheme>

Critical Details to Keep in Mind: #

• The root <scheme> tag is mandatory: include a name (the display name for your scheme), version (142 is compatible with 2017.3.5), and parent (pick a base scheme like Darcula or Default to inherit styles you don't explicitly set).
• Color names must be uppercase with underscores: your original definition-foreground becomes DEFINITION_FOREGROUND, which matches PyCharm's internal naming rules.
• Every color lives inside the <colors> block, defined as a <color> element with name (the internal identifier) and value (your hex color code) attributes.

How to Install This Scheme: #

1. Save the XML above as hot_fudge_sunday_color_scheme.icls.
2. Drop it into PyCharm's color scheme directory:
   • Windows: C:\Users\<YourUsername>\.PyCharmCE2017.3\config\colors
   • Mac: ~/Library/Preferences/PyCharmCE2017.3/colors
   • Linux: ~/.PyCharmCE2017.3/config/colors
3. Restart PyCharm, then head to Settings > Editor > Color Scheme—you'll see "Hot Fudge Sunday" in the list of available schemes.

If some elements don't pick up your colors, double-check the name attributes match PyCharm's exact identifiers. You can export an existing default scheme to see the full list of valid color names if needed.

内容的提问来源于stack exchange，提问作者Toothpick Anemone