Python Pandas: error: missing ), unterminated subpattern at position 2

A more general solution would be to escape the input token using re.escape

import re
inputToken = '((('
df['Title'] = df['Title'].str.replace(re.escape(inputToken), '>>')

replace in pandas lets you use regex and ( has special meaning in regex so use \(

df['Title'] = df['Title'].str.replace('\(\(\(', '>>')

pandas doc: pandas.Series.str.replace

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