I can't delete the row with na pandas code example

Example 1: how to delete na values in a dataframe

# if you want to delete rows containing NA values
df.dropna(inplace=True)

Example 2: pandas drop row with nan

import pandas as pd

df = pd.DataFrame({'values_1': ['700','ABC','500','XYZ','1200'],
                   'values_2': ['DDD','150','350','400','5000'] 
                   })

df = df.apply (pd.to_numeric, errors='coerce')
df = df.dropna()
df = df.reset_index(drop=True)

print (df)