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+--- Thread: New to Python, How does this lambda expression works? (/thread-25312.html)
New to Python, How does this lambda expression works? - Joshh_33 - Mar-26-2020
Hi,
I would like to arrange the tuple in ascending order according to the price.
The first one,("Product1") is the name of the product,
while the second one, (10) is the price of the product.
It works perfectly when I type 1 there.
items = [
("Product1", 10),
("Product2", 9),
("Product3", 12),
]
items.sort(key=lambda item: item[1])
print(items)The output would be like this.Output:[('Product2', 9),
('Product1', 10),
('Product3', 12)]items = [
("Product1", 10),
("Product2", 9),
("Product3", 12),
]
items.sort(key=lambda item: item[2])
print(items)Error:Traceback (most recent call last):
File "d:\.Coding Files\Python\HelloWorld\app.py", line 15, in <module>
items.sort(key=lambda item: item[2])
File "d:\.Coding Files\Python\HelloWorld\app.py", line 15, in <lambda>
items.sort(key=lambda item: item[2])
IndexError: tuple index out of rangeSome help would be much appreciated!
RE: New to Python, How does this lambda expression works? - buran - Mar-26-2020
tuple indexes (as normal for python) start from 0. So,
item[0] would be the first item in the tuple, and accordingly it will be sorted - e.g. if you had Product11 it will be before Product2
RE: New to Python, How does this lambda expression works? - Joshh_33 - Mar-26-2020
Oh! I can finally understand it. Thanks a lot!!