Create a Column Based on a Conditional in pandas
Preliminaries
/* Import required modules */
import pandas as pd
import numpy as npMake a dataframe
data = {'name': ['Jason', 'Molly', 'Tina', 'Jake', 'Amy'],
'age': [42, 52, 36, 24, 73],
'preTestScore': [4, 24, 31, 2, 3],
'postTestScore': [25, 94, 57, 62, 70]}
df = pd.DataFrame(data, columns = ['name', 'age', 'preTestScore', 'postTestScore'])
df| name | age | preTestScore | postTestScore | |
|---|---|---|---|---|
| 0 | Jason | 42 | 4 | 25 |
| 1 | Molly | 52 | 24 | 94 |
| 2 | Tina | 36 | 31 | 57 |
| 3 | Jake | 24 | 2 | 62 |
| 4 | Amy | 73 | 3 | 70 |
Add a new column for elderly
/* Create a new column called df.elderly where the value is yes
if df.age is greater than 50 and no if not */
df['elderly'] = np.where(df['age']>=50, 'yes', 'no')/* View the dataframe */
df| name | age | preTestScore | postTestScore | elderly | |
|---|---|---|---|---|---|
| 0 | Jason | 42 | 4 | 25 | no |
| 1 | Molly | 52 | 24 | 94 | yes |
| 2 | Tina | 36 | 31 | 57 | no |
| 3 | Jake | 24 | 2 | 62 | no |
| 4 | Amy | 73 | 3 | 70 | yes |
Python Example for Beginners
Two Machine Learning Fields
There are two sides to machine learning:
- Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
- Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.
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