Lambda in Python
Python Lambda Desmistification — #PurePythonSeries — Episode #00
This post attempts to demystify Lambda in Python.
Simply put, a lambda function is just like any normal python function, except that it has no name when defining it, and it is contained in one line of code. A lambda function evaluates an expression for a given argument. You give the function a value (argument) and then provide the operation (expression) — From TowardsDatascience.com.
LAMBDA
How To Get A Lambda Expression just from times2 function?
Here is the original function:
def times2(var):
return var*2The times2 function can be written in one line:
Rewriting it in one line:
def times2(var):return var*2Now, get rid of the def keyword:
times2(var):return var*2Now, to get a lambda expression just get rid of the name of the function (typing lambda in its place — because lambda is an anonymous function);
lambda(var):return var*2And get rid of the parentheses adding space in front (cleaning the code:);
lambda var:return var*2And finally, get rid of return word (its function is assumed by the colon ), like this :)
lambda var:var*2It Reads: lambda takes var and returns var*2.
Just in one line. Simple Like That! Awesome!
This is not usual for lambda, but it is a feasible use (saving lambda times2 to var t2):
t2 = lambda var:var*2t2(5)10
Now use Map plus Lambda together:
# Using Map function plus Lambda function (what it is build for!):
seq = [1,2,3,4,5]
map(lambda var:var*2, seq)<map at 0x7f0640b37b38>
# Casting Map to a List:
list(map(lambda var:var*2, seq))[2, 4, 6, 8, 10]
Complete code:)
seq = [1,2,3,4,5]
print(list(map(lambda var:var*2, seq)))[2, 4, 6, 8, 10]
👉Jupiter notebook link :)
👉git
Credits & References
Lambda Functions with Practical Examples in Python — How, when to use, and when not to use Lambda functions by towardsdatascience.com
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Edited at Dec_2021 — completing the code to run in pycharm:)
