delete rows from pandas dataframe based on condition code example

Example 1: delete rows based on condition python

df = df.drop(df[df.score < 50].index)

Example 2: how to combine delete rows based on condition on another dataframe

import pandas as pd

USERS = pd.DataFrame({'email':['[email protected]','[email protected]','[email protected]','[email protected]','[email protected]']})
print (USERS)
     email
0  a@g.com
1  b@g.com
2  b@g.com
3  c@g.com
4  d@g.com

EXCLUDE = pd.DataFrame({'email':['[email protected]','[email protected]']})
print (EXCLUDE)
     email
0  a@g.com
1  d@g.com

Example 3: how to combine delete rows based on condition on another dataframe

print (USERS.email.isin(EXCLUDE.email))
0     True
1    False
2    False
3    False
4     True
Name: email, dtype: bool

print (~USERS.email.isin(EXCLUDE.email))
0    False
1     True
2     True
3     True
4    False
Name: email, dtype: bool

print (USERS[~USERS.email.isin(EXCLUDE.email)])
     email
1  b@g.com
2  b@g.com
3  c@g.com