Common lambda functions

lambdas.py

# square
sq = lambda x: x * x
sq(99)                                              # 9801

# sum rgb
rgb = lambda r, g, b: r + g + b
rgb(45, 22, 35)                                     # 102

# remove duplicate values from iterable
remove_duplicates = lambda iterable: list(set(iterable))
remove_duplicates("roooot")                         # ['o', 't', 'r']
remove_duplicates([1, 2, 2, 3, 4, 4])               # [1, 2, 3, 4]

# Convert list to int
convert_list_to_int = lambda iterable: map(int, iterable)
convert_list_to_int(['123', '34', '5667'])          # 123, 34, 5667[]
# map - returns an iterator that applies a function to every item of iterable and yields the result


# Print list elements with separator
lst = [34, '234234', 566]
print(*lst, sep='\n')

# Check if number is even
is_even = lambda num: num % 2 == 0
is_even(2)                                          # True

# Get all even items from a list / range
evens = lambda lst: filter(is_even, lst)
evens([2, 1, 22])                                   # [2, 22]
# filter - construct an iterator from those elements of iterable for which function returns true