Get started learning Python with DataCamp's free Intro to Python tutorial. Learn Data Science by completing interactive coding challenges and watching videos by expert instructors. Start Now!
This site is generously supported by DataCamp. DataCamp offers online interactive Python Tutorials for Data Science. Join 11 million other learners and get started learning Python for data science today!
Good news! You can save 25% off your Datacamp annual subscription with the code LEARNPYTHON23ALE25 - Click here to redeem your discount
Partial functions
You can create partial functions in python by using the partial function from the functools library.
Partial functions allow one to derive a function with x parameters to a function with fewer parameters and fixed values set for the more limited function.
Import required:
from functools import partial
This code will return 8.
from functools import partial
def multiply(x, y):
return x * y
# create a new function that multiplies by 2
dbl = partial(multiply, 2)
print(dbl(4))
An important note: the default values will start replacing variables from the left. The 2 will replace x. y will equal 4 when dbl(4) is called. It does not make a difference in this example, but it does in the example below.
Exercise
Edit the function provided by calling partial() and replacing the first three variables in func(). Then print with the new partial function using only one input variable so that the output equals 60.
#Following is the exercise, function provided:
from functools import partial
def func(u, v, w, x):
return u*4 + v*3 + w*2 + x
#Enter your code here to create and print with your partial function
from functools import partial
def func(u, v, w, x):
return u*4 + v*3 + w*2 + x
p = partial(func,5,6,7)
print(p(8))
#test_object('p')
test_output_contains('60')
success_msg('Good job!')
This site is generously supported by DataCamp. DataCamp offers online interactive Python Tutorials for Data Science. Join over a million other learners and get started learning Python for data science today!
Sponsors
