python函數(shù)實(shí)例化

In terms of Mathematics and Computer science, currying is the approach/technique by which we can break multiple-argument function to single argument function.

從數(shù)學(xué)和計(jì)算機(jī)科學(xué)的角度來看， 柯里化是一種方法/技術(shù)，通過它我們可以將多參數(shù)功能分解為單參數(shù)功能。

Mathematical illustration: h(x)=g(f(x))

數(shù)學(xué)圖示：h(x)= g(f(x))

The composition of two functions is a chaining process in which the output becomes the input for the outer function.

兩個(gè)函數(shù)的組合是一個(gè)鏈接過程，其中輸出成為外部函數(shù)的輸入。

def currying( g , f ):def h(x):return g(f(x))return h

In the technical term "Currying is the process of transforming a function that takes 'n' arguments into a series of 'n' function that only takes the one argument each."

在技??術(shù)術(shù)語中， “固化是將采用'n'個(gè)參數(shù)的函數(shù)轉(zhuǎn)換為一系列只采用一個(gè)參數(shù)的'n'函數(shù)的過程。”

In problem-solving approach, currying is to be done to simplify the programming i.e. execution of the function which takes multiple arguments into the single - single argument functions.

在解決問題的方式， 鉆營被做了簡化這需要多個(gè)參數(shù)到單一功能的編程也就是執(zhí)行-單參數(shù)的函數(shù)。

Example code 1:

示例代碼1：

def f(a):def g(b, c, d, e):print(a, b, c, d, e)return g #as in f it return g this is curryingf1 = f(1)f1(2,3,4,5)

Output

輸出量

1 2 3 4 5

Explanation of the above code:

上面的代碼說明：

Now, f(1) returns the function g(b, c, d, e) which, for all b, c, d, and e, behaves exactly like f(1, b, c, d, e). Since g is a function, it should support currying as well.

現(xiàn)在， f(1)返回函數(shù)g(b，c，d，e) ，對(duì)于所有b ， c ， d和e ，其行為都與f(1，b，c，d，e)完全一樣。 由于g是一個(gè)函數(shù)，因此它也應(yīng)該支持curring 。

Example code 2:

示例代碼2：

def f(a):def g(b):def h(c):def i(d):def j(e):print(a, b, c, d, e)return j #return to function ireturn i #return to function hreturn h #return to function greturn g #return to function ff(1)(2)(3)(4)(5)

Output

輸出量

1 2 3 4 5

Explanation of the above code:

上面的代碼說明：

In the code we have, X(a,b,c,d,e) = f(g(h(i(j(a,b,c,d,e))))

在代碼中， X(a，b，c，d，e)= f(g(h(i(j(a，b，c，d，e))))

Here, the concept is of nesting of one function to another and hence the result of one function get stored or recorded in another function as a chain of functions.

在此，概念是將一個(gè)功能嵌套到另一個(gè)功能，因此一個(gè)功能的結(jié)果作為功能鏈存儲(chǔ)或記錄在另一個(gè)功能中。

Note: Now f(a,b,c,d,e) is no more i.e. now f no more take 5 arguments.

注意：現(xiàn)在f(a，b，c，d，e)不再存在，即現(xiàn)在f不再接受5個(gè)參數(shù)。

Python example of currying function to convert INR to pounds

將INR轉(zhuǎn)換為英鎊的currying函數(shù)的Python示例

# program to covert the Indian Rupee to Pound # Demonstrating Currying of composition of function def change(b, c): def a(x): #by currying functionreturn b(c(x)) return a def IR2USD(ammount): return ammount*0.014 # as 1IR=0.014USDdef USD2Pound(ammount): # Function converting USD to Pounds return ammount * 0.77 if __name__ == '__main__': Convert = change(IR2USD,USD2Pound )e = Convert(565)print("Conveted Indian Rupee to Pound:")print('565 INDIAN RUPEES =',e,'PoundSterling')

Output

輸出量

Conveted Indian Rupee to Pound: 565 INDIAN RUPEES = 6.0907 PoundSterling

翻譯自: https://www.includehelp.com/python/currying-function-with-example.aspx

python函數(shù)實(shí)例化

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