what is this python error
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1. Error: `NameError: name 'variable' is not defined`
2. Cause: The variable `variable` has not been defined before it is used.
3. Solution: Define the variable before using it, e.g., `variable = 5`.
2. Cause: The variable `variable` has not been defined before it is used.
3. Solution: Define the variable before using it, e.g., `variable = 5`.
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建议：检查关键词是否有错别字，或换一个更常见的说法。