Monday, April 17, 2017

Python Pandas Dataframe - Where Condition Example

Here is an example on using Where condition on pandas dataframe.
Census data used as source.

Use Case : 

  • Read Population data for state of California from "" URL.
  • Get Counties with population more than 1000000.

Syntax : 


Main Parameters :

condition : 

     Condition should return boolean.

inplace :

    Whether to perform the operation in place
raise_on_error :
  •     Raise error on invalid data types

Sample Code

import pandas as pd
df = pd.read_csv("")
df = df[["NAME","POP100"]]
df.where(df["POP100"] > 1000000).dropna(how='all')

Sample Output

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