知っておきたいPythonの強力な５つのOne-Liners

という記事。

5 Powerful Python One-Liners You Should Know | by Görkem Arslan | Jul, 2021 | Level Up Coding

1- Typecasting of all items in a list

code:sample.py

# Example 1:

>> list(map(int, '1', '2', '3'))

# Output:

1, 2, 3

# Example 2:

This is also useful when we want to make a list consisting of heterogonous items homogeneous.

>> list(map(float, '1', 2, '3.0', 4.0, '5', 6))

# Output:

1.0, 2.0, 3.0, 4.0, 5.0, 6.0

2- Sum of digits of an integer

code:smaple.py

#You don’t have to use mathematical operators, i.e. / (division) and % (modulo) operators, to compute the sum of digits of an integer number. There is an alternative way to do that. If we convert the number to a string, everything becomes easy. But how? We’ve already known that strings are iterable so we can iterate over characters of a string with map() function. We’ll basically use this logic.

>> sum_of_digits = lambda x: sum(map(int, str(x)))

# Example:

>> print(sum_of_digits(1789))

# Output:

3- Flat a list that contains sublists

code:sample.py

# Example:

>> l = 1, 2, 3], 4, 5, 6, 7, 8, [9

>> flattened_list = item for sublist in l for item in sublist

>> print(flattened_list)

# Output:

1, 2, 3, 4, 5, 6, 7, 8, 9