在Python中，+ =， - =，* =和/ =代表什麼？

Question

什麼呢

+ =， - =，* =和/ =

立場在Python？你如何使用它而循環？

Answer 1

即不僅蟒，也就是在大多數編程語言

X = 1的; x + = 1; x將是2

x = 1; x- = 1; x將爲0

x = 3; x * = 2; x將是6

x = 6; x/= 2; x是3

Answer 2

他們正在執行的操作，然後將其分配到變量：

a += b是相同的a = a + b

a -= b是相同的a = a - b

a *= b是一樣a = a * b

a /= b與相同

您可以在while循環以同樣的方式使用它們，你將使用擴展形式：

i = 0 
while i < 5: 
    print i 
    i += 1 # The same of i = i + 1 

Answer 3

很肯定這是教師如何「早在天」會處理這個問題：

i = 2 
while i != 1: 
    print "I will first do basic research." 
    i += 1 
    i *= 1 
    i /= 1 
    i -= 1 

Answer 4

這些都是運營商分配的速記：

Operator symbol  Name of the operator Example  Equivalent construct 

      +=   Addition assignment  x += 4;  x = x + 4; 
      -=   Subtraction assignment  x -= 4;  x = x - 4; 
      *=   Multiplication assignment x *= 4;  x = x * 4; 
      /=   Division assignment  x /= 4;  x = x/4; 
      %=   Remainder assignment  x %= 4;  x = x % 4; 

Answer 5

這些（+=,-=,*=和/=）被稱爲augmented arithmetic assignments。它們對應於下列方法：

object.__iadd__(self, other) 
object.__isub__(self, other) 
object.__imul__(self, other) 
object.__idiv__(self, other) 

的i語義的意思是「就地」，這意味着它們修改對象（或數字組成的情況下參考），而不必額外地將它們分配：

while condition: 
    foo += bar 

等同於：

while condition: 
    foo = foo + bar