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I am trying to write a dataframe to an Excel spreadsheet using ExcelWriter, but it keeps returning an error:

openpyxl.utils.exceptions.IllegalCharacterError

I'm guessing there's some character in the dataframe that ExcelWriter doesn't like. It seems odd, because the dataframe is formed from three Excel spreadsheets, so I can't see how there could be a character that Excel doesn't like!

Is there any way to iterate through a dataframe and replace characters that ExcelWriter doesn't like? I don't even mind if it simply deletes them.

What's the best way or removing or replacing illegal characters from a dataframe?

Answers

Based on Haipeng Su's answer, I added a function that does this:

dataframe = dataframe.applymap(lambda x: x.encode('unicode_escape').
                 decode('utf-8') if isinstance(x, str) else x)

Basically, it escapes the unicode characters if they exist. It worked and I can now write to Excel spreadsheets again!