Answers for "select rows from dataframe based on condition"

fetch row where column is equal to a value pandas

df.loc[df['column_name'] == 'value']

new dataframe based on certain row conditions

# Create variable with TRUE if nationality is USA
american = df['nationality'] == "USA"

# Create variable with TRUE if age is greater than 50
elderly = df['age'] > 50

# Select all cases where nationality is USA and age is greater than 50
df[american & elderly]