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Is there a way to perform if in pythons lambda? [duplicate] @Glenn Maynard: There's almost no reason to use a lambda, period Assigning a lambda to a variable -- as a stand-in for def-- is generally a Very Bad Idea (tm) Just use a def so mere mortal programmers can read, interpret, understand and maintain it –
What exactly is lambda in Python? - Stack Overflow Also lambda can be used in an expression directly, while def is a statement def f(x, y): return x + y Would give you almost the same result as f = lambda x, y: x + y And you can use it directly in an expression g(5, 6, helper=lambda x, y: x + y) which with def would be less concise
Aggregating in pandas groupby using lambda functions Here is runnable example: import numpy as np import pandas as pd N = 100 data = pd DataFrame({ 'type': np random randint(10, size=N), 'status': np random randint(10