Can somebody explain how this works? df.columns = list(map(str, df.columns))

CodePudding user response：

Your code is not the best way to convert column names to string, use instead:

df.columns = df.columns.astype(str)

Your code:

df.columns = list(map(str, df.columns))

is equivalent to:

df.columns = [str(col) for col in df.columns]

map: for each item in df.columns (iterable), apply the function str on it but the map function returns an iterator, so you need to explicitly execute list to generate the list.