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Python: Filter a list of integers using Lambda

Python Lambda: Exercise-5 with Solution

Write a Python program to filter a list of integers using Lambda.

Sample Solution:

Python Code :

nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
print("Original list of integers:")
print(nums)
print("\nEven numbers from the said list:")
even_nums = list(filter(lambda x: x%2 == 0, nums))
print(even_nums)
print("\nOdd numbers from the said list:")
odd_nums = list(filter(lambda x: x%2 != 0, nums))
print(odd_nums)

Sample Output:

Original list of integers:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Even numbers from the said list:
[2, 4, 6, 8, 10]

Odd numbers from the said list:
[1, 3, 5, 7, 9]

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Test for a single number:

Python Code :

print((lambda x: (x % 2 and 'Odd number' or 'Even number'))(5))
print((lambda x: (x % 2 and 'Odd number' or 'Even number'))(8))

Sample Output:

Odd number
Even number

Python Code Editor:

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Previous: Write a Python program to sort a list of dictionaries using Lambda.
Next: Write a Python program to square and cube every number in a given list of integers using Lambda.

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Python: Tips of the Day

Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value:

Example:

def tips_map_values(obj, fn):
  ret = {}
  for key in obj.keys():
    ret[key] = fn(obj[key])
  return ret
users = {
  'Owen': { 'user': 'Owen', 'age': 29 },
  'Eddie': { 'user': 'Eddie', 'age': 15 }
}

print(tips_map_values(users, lambda u : u['age'])) # {'Owen': 29, 'Eddie': 15}

Output:

{'Owen': 29, 'Eddie': 15}