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i just added non-string error

Code
Diff
  • def fun(str1):
        if not isinstance(str1, str):
            raise ValueError("Input must be a string")
    
        return str1.upper()
    • def fun(str):
    • return str.upper()
    • def fun(str1):
    • if not isinstance(str1, str):
    • raise ValueError("Input must be a string")
    • return str1.upper()