self.fall =Falsedef__iter__(self):"""Return the match method once, then stop"""yieldself.matchraiseStopIterationdefmatch(self, *args):"""Indicate whether or not to enter a case suite"""ifself.fallornotargs:returnTrueelifself.valueinargs:# changed for v1.5, see belowself.fall =Trueret...
print(switch('a')) # 输出: case a print(switch('d')) # 输出: default 使用类装饰器和字典: pythonclass Switch: def __init__(self, key): self.key = key @property def case(self): return { 'a': 'case a', 'b': 'case b', 'c': 'case c', }.get(self.key, 'default') p...
在ifelse.py文件中输入如下内容 import time from collections import defaultdict # 计算运行时间的装饰器 def run_time(func): def wrapper(*args, **kw): start = time.time() func(*args, **kw) end = time.time() print('running', end-start, 's') return wrapper # 准备好两个字典 options =...
result= 1003returnresult#Press the green button in the gutter to run the script.if__name__=='__main__': print_hi('good day') main() product_code= func_switch_case("bag")print(f"bag的产品编号:{product_code}") product_code= func_switch_case2("pencil")print(f"case2_pencil的产品...
可以匹配单个表达式的赋值目标。为了演示方便,每个例子都会放到函数中,把 match 后面的待匹配的变量作为参数 (capture_pattern.py): def capture(greeting): match greeting: case "": print("Hello!") case name: print(f"Hi {name}!") if name == "Santa": ...
为什么要有此一问呢?原因是有太多语言自带 switch 语句,而且也有很多人尝试编写提供 switch 功能的库(我记得在 PyCoder's Weekly 里曾见到过两次)。我(Python猫)本人自始至终并不喜欢 switch,几乎可以肯定地说,Python 未来也不会有 switch,但是,它很可能会引入一个类似于 switch 且更为复杂的语法结构...
在ifelse.py文件中输入如下内容 import time from collections import defaultdict # 计算运行时间的装饰器 def run_time(func): def wrapper(*args, **kw): start = time.time() func(*args, **kw) end = time.time() print('running', end-start, 's') return wrapper # 准备好两个字典 options ...
A quick poll during mykeynotepresentation at PyCon 2007 shows this proposal has no popular support. I therefore reject it. 我在PyCon 2007 的主题演讲中做了一个快速的民意调查,结果表明这个提案没有得到广泛的支持。因此,我拒绝了它。 简而言之,PEP 提案有了,语法实现也有了雏形,但是核心开发者们似乎没...
Python是没有switch/case语句的,当然,由于Python语言的灵活,我们可以使用字典映射来构建一个switch...case语句: ? 1 2 3 4 5 6 7 defnumbers_to_strings(argument): switcher={ 0:"zero", 1:"one", 2:"two", } returnswitcher.get(argument,"nothing") ...
Aug 19, 2015 setup.py MAINT: Add setup.py. Aug 19, 2015 Repository files navigation README MIT licenseswitchcase switchcase implements a simple Switch-Case construct in Pure Python.Under the hood, the switch function works by simply returning a length-1 list containing a matching function. Th...