Python中的模式匹配库Pampy使用实例解析

pip install pampy

from pampy import match, _
result = match(3,
    1, "one",
    2, "two",
    _, "other"
)
print(result)  # 输出: "other"

from pampy import match, _
# 值匹配
result = match(42,
    42, "Answer to the Ultimate Question"
)
# 通配符匹配
result = match(10,
    _, "Matched any value"
)
# 列表匹配
result = match([1, 2, 3],
    [1, _, 3], "Matched pattern"
)

from pampy import match, _
# 模式嵌套
result = match([1, [2, 3]],
    [_, [2, _]], "Nested pattern matched"
)
# 类型匹配
result = match(42,
    int, "Matched an integer"
)

from pampy import match, _
def is_even(x):
    return x % 2 == 0
result = match(5,
    is_even, "Even number",
    _, "Odd number"
)

from pampy import match, _

data = [1, 2, 3]

result = match(data,
    [], "Empty list",
    [1, _, _], "List starts with 1"
)

from pampy import match, _
def handle_request(request):
    return match(request,
        {"method": "GET", "path": "/"}, "Home page",
        {"method": "GET", "path": "/about"}, "About page",
        _, "Not found"
    )

from pampy import match, _
config = {"mode": "production", "debug": True}
result = match(config,
    {"mode": "development"}, "Development mode",
    {"mode": "production", "debug": True}, "Production mode with debugging",
    _, "Other configuration"
)