Python 函数和运算符

Question

I am a beginner learning Python programming languages and I need you to explain in simple terms how an operator works with the given example.

I stumbled upon this thing called assignment operators:

x=1

y=3

x!=y

From the given example, the example is:

x=1 and means x=1

x+=1 and means x=x+1

x-=2 and means x=x-2

x*=5 and means x=x*5

1. When should assignment operators be used? In what kinds of situation, (with an example/scenario will you use these operators to solve?

2. How do you apply a hexidecimal in a given situation or octal string? The following three functions I have trouble understanding how they work. If possible, explain it in simple terms. Thank you!

hex(x) or oct(x)

chr(u)

ord(x)

Answer 1

Assignment operators are just shorthand, and you would usually use them in some sort of reduction operator, eg

dot_prod = 0
for a,b in zip(vector1,vector2):
  dot_prod += a * b

chr() and ord() are mirror operations to convert characters to their ASCII index and back, eg ord('A') is 65, etc. For any given character, chr(ord(x)) == x