The Problem: Why Batch Files Fail I recently encountered an unusual error when attempting to drop certain filenames into a Python app as inputs. After a moment, I realized the troubled ones had a comma in their filename, which should be totally valid, isn't it? It turns out Windows Batch ( cmd.exe ) is built on legacy rules where the comma ( , ) , semicolon ( ; ) , and equals sign ( = ) are treated as delimiters, exactly like a space . When you drag a file named Data,Project.txt onto a .bat file: Explorer sends the raw string to the command processor. CMD sees the comma and splits the filename into two arguments: %1 becomes Data and %2 becomes Project.txt . The comma is deleted from the stream entirely ( 🤦 ). The Solutions: From Hack to Hero Method The "Ugly Hack" (Batch) The "Robust" Way (Shortcut) The "Pro" Way (PyInstaller) Setup Create a .bat file with %* Right-click .py > Create Shortcut Compile script to a standalone .exe The Tri...
Posts
Showing posts from April, 2026