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MB001: unparsable-cells

🚨 Breaking ❌ Not Fixable

MB001: Cell contains unparsable code.

What it does

Identifies cells that cannot be parsed into valid Python AST nodes, indicating fundamental syntax or encoding problems that prevent the notebook from being loaded.

Why is this bad?

Unparsable cells prevent the notebook from running as a script and will throw errors when executed in notebook mode. While marimo can still open the notebook, these cells cannot be run until the parsing issues are resolved.

Examples

Problematic: 

# Cell with encoding issues or corrupt data
x = 1 \x00\x01\x02  # Binary data in source

Problematic: 

# Cell with fundamental syntax errors
def func(
    # Missing closing parenthesis and body

Solution: 

# Fix syntax errors and encoding issues
def func():
    return 42

References