pandas find rows with 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: check if a value in dataframe is nan

#return a subset of the dataframe where the column name value == NaN 
df.loc[df['column name'].isnull() == True]

Example 3: to detect if a data frame has nan values

df.isnull().sum().sum()
5

Example 4: find nan values in a column pandas

df['your column name'].isnull().values.any()

Example 5: select rows with nan pandas

df[df['Col2'].isnull()]

Example 6: pandas if nan, then the row above

df.fillna(method='ffill')