文檔字符串：在函數(shù)中寫文檔
def square(x): "document strings" return x * x可以如下顯示
PRint(square.__doc__)help(square)example:
def func(posParam, keyParam=defaultValue, *posColParam, **keyColParam): print(posParam) print(keyParam) print(posColParam) # as tuple print(keyColParam) # as dictexample:
def print_params(x, y, z = 3, *pospar, **keypar): print(x, y, z) print(pospar) print(keypar)print_params(1,2,3, 5,6,7, foo=1,bar=2)屏蔽(shadowing)
對(duì)于同名變量，局部變量能屏蔽(shadow)全局變量
globals()獲取全局變量的值，聲明此變量是全局變量可以使用關(guān)鍵字globalvars()是globals()的近親函數(shù)locals()是聲明此變量時(shí)局部變量mint:按照理解應(yīng)該是獨(dú)立的內(nèi)存空間或者stack吧
全局作用域局部作用域作用域可以嵌套閉包(closure):函數(shù)存儲(chǔ)于封閉作用域的行為
def Multiplier(factor): def MultiplierByFactor(number): return number * factor return MultiplierByFactornonlocal()對(duì)外部作用域(非全局作用域)的變量進(jìn)行賦值遞歸的定義：引用自身
recursion: please see the definition recursion
注意避免寫出沒(méi)有邊界條件的infinite recursion 否則會(huì)產(chǎn)生“超過(guò)最大遞歸深度”的錯(cuò)誤
一般函數(shù)
sum(seq) # 返回seq中所有元素和apply(func[, args[, kwargs] ] ) # 調(diào)用函數(shù)，可以提供參數(shù)新聞熱點(diǎn)
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