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')