Remove rows or columns with missing values

Sort rows by values or index

Find unique values in a Series

pandas/fillna

Fill NaN values with a specified value

pandas

missing

fillna

df.fillna

df.fillna() replaces NaN values with specified values or methods.

Replace NaN with 0

df.fillna(0)

Forward fill missing values

df.fillna(method="ffill")

Backward fill missing values

df.fillna(method="bfill")

Convert Series to specified dtype

Count occurrences of each unique value

Read a CSV file into a DataFrame