pd.read_csv('file.csv'): Reads data from a CSV file into a DataFrame. pd.read_excel('file.xlsx'): Reads data from an Excel file. df.to_csv('output.csv', index=False): Writes DataFrame to a CSV file.

A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by ...