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lambda function in python

how to use lambda in python

python

lambda parameters:expression

Example for sort list :

python

items = [
    ("product0",20),
    ("product1",10),
    ("product3",40)
]
def sort_item(item):
  return item[1]
items.sort(key=sort_item)
print(items)

Implement this code with lambda:

python

items = [
    ("product0",20),
    ("product1",10),
    ("product3",40)
]
items.sort(key=lambda item:item[1])
print(items)

Output

[("product0",10),
("product1",20),
("product3",40)]

Example for map function

python

items = [
    ("product0",20),
    ("product1",10),
    ("product3",40)
]
prices = []
for item in items:
  prices.append(item[1])
print(prices)

Implement this code with lambda:

python

items = [
    ("product0",20),
    ("product1",10),
    ("product3",40)
]
prices = list(map(lambda item:item[1],items))
print(prices)

Output

[10,20,40]

Example for filter function

python

items = [
    ("product0",20),
    ("product1",10),
    ("product3",40)
]
filtered = list(filter(lambda item:item[1] >= 20,items))
print(filtered)

Output

[("product1",20),
("product3",40)]

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