pandas find nan code example

Example 1: count nan pandas

#Python, pandas
#Count missing values for each column of the dataframe df

df.isnull().sum()

Example 2: find position of nan pandas

# position of NaN values in terms of index
df.loc[pandas.isna(df["b"]), :].index

# position of NaN values in terms of rows that cotnain NaN
df.loc[pandas.isna(df["b"]), :]

Example 3: find nan values in a column pandas

df.isnull().values.any()

Example 4: find nan values in a column pandas

df['your column name'].isnull().sum()

Example 5: find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()

Example 6: to detect if a data frame has nan values

> df.isnull().any().any()
True