too-many-branches / R0912

Message emitted:

Too many branches (%s/%s)

Description:

Used when a function or method has too many branches, making it hard to follow.

Problematic code:

def num_to_word(x):  # [too-many-branches]
    if x == 0:
        return "zero"
    elif x == 1:
        return "one"
    elif x == 2:
        return "two"
    elif x == 3:
        return "three"
    elif x == 4:
        return "four"
    elif x == 5:
        return "five"
    elif x == 6:
        return "six"
    elif x == 7:
        return "seven"
    elif x == 8:
        return "eight"
    elif x == 9:
        return "nine"
    else:
        return None

Correct code:

def num_to_word(x):
    return {
        0: "zero",
        1: "one",
        2: "two",
        3: "three",
        4: "four",
        5: "five",
        6: "six",
        7: "seven",
        8: "eight",
        9: "nine",
    }.get(x)

Configuration file:

[main]
max-branches=10

Created by the design checker.