ref_url: http://deanla.com/dont_reinvent_pandas.html#Map-with-dict ref_name: DeanLa's Blog ---

Map with dict¶

A dict is a callable with $f(key) = value$, there for you can call .map with it. In this example I want to make int key codes into letter.

df.event_type.map(lambda x: x+3).head()

date_
2018-10-09 17:01:30.662389     8
2018-10-09 17:01:30.687675     8
2018-10-09 17:03:23.952847     4
2018-10-09 17:05:42.327744    10
2018-10-09 17:06:29.708909    10
Name: event_type, dtype: int64

# A dict is also a calleble
df['event_type'] = df.event_type.map({
    1:'A',
    5:'B',
    7:'C'
})
df.head()

	event_type
date_
2018-10-09 17:01:30.662389	B
2018-10-09 17:01:30.687675	B
2018-10-09 17:03:23.952847	A
2018-10-09 17:05:42.327744	C
2018-10-09 17:06:29.708909	C