Let's take a simple function that takes a str and returns a dataframe:
import pandas as pd
def csv_to_df(path):
return pd.read_csv(path, skiprows=1, sep='\t', comment='#')
What is the recommended pythonic way of adding type hints to this function?
If I ask python for the type of a DataFrame it returns pandas.core.frame.DataFrame
.
The following won't work though, as it'll tell me that pandas is not defined.
def csv_to_df(path: str) -> pandas.core.frame.DataFrame:
return pd.read_csv(path, skiprows=1, sep='\t', comment='#')
Why not just use pd.DataFrame
?
import pandas as pd
def csv_to_df(path: str) -> pd.DataFrame:
return pd.read_csv(path, skiprows=1, sep='\t', comment='#')
Result is the same:
> help(csv_to_df)
Help on function csv_to_df in module __main__:
csv_to_df(path:str) -> pandas.core.frame.DataFrame