# 0214
## 一、運算子
### 1.算術運算符
>| operator | name | example |
>|:--------:|:--------------:|:-------:|
>| + | addition | x+y |
>| - | Subtraction | x - y |
>| * | Multiplication | x * y |
>| / | Division | x / y |
>| % | Modulus | x % y |
>| ** | Exponentiation | x ** y |
>| // | Floor division | x // y |

### 2.賦值運算符
>| operator | example | same as |
>| -------- | ------- | ------- |
>| = | x = 5 | x = 5 |
>| += | x += 3 | x = x + 3 |
>| -= | x -= 3 | x = x - 3 |
>| /= | x /= 3 | x = x / 3 |
>| %= | x %= 3 | x %= 3 |
>| //= | x //= 3 | x = x // 3 |
>| **= | x **= 3 | x = x ** 3 |
>| &= | x &= 3 | x = x & 3 |
>| l= | x l= 3 | x = x l 3 |
>| ^= | x ^= 3 | x = x ^ 3 |
>| >>= | x >>= 3 | x = x >> 3 |
>| <<= | x <<= 3 | x = x << 3 |

### 3.比較運算符
>| Operator |Name | Example |
>| -------- | -------- | -------- |
>| == | Equal | x == y |
>| != | Not equal | x != y |
>| > | Greater than | x > y |
>| < | Less than | x < y |
>| >= | Greater than or equal to | x >= y |
>| <= | Less than or equal to | x <= y |

### 4.邏輯運算符
>| Operator |Description | Example |
>| -------- | -------- | -------- |
>| and | Returns True if both statements are true | x < 5 and x < 10 |
>| or | Returns True if one of the statements is true | x < 5 or x < 4 |

## 上課筆記
print 輸出，input 輸入
> 9指定給x
> x=9
> print(x)

### 1.加減
> x = 5
>y = 3
print(x + y)

>x = 5
x += 3
print(x)

> x = 5
y = 3
print(x - y)

> x = 5
x -= 3
print(x)

### 2.乘除
> x = 5
y = 3
print(x * y)

> x = 5
x *= 3
print(x)

> x = 5
y = 3
print(x / y)

> x = 5
x /= 3
print(x)

### 3.5/6的(餘數) %
>x = 5
y = 6
print(x % y)

> x = 5
x%=6
print(x)

### 4.數字**幾(次方)
> x = 2
y = 5
print(x ** y) #same as 2*2*2*2*2

> x = 2
x **= 5
print(x)

### 5.15/2的整數捨去小數點 // (求商)
> x = 15
y = 2
print(x // y)
#the floor division // rounds the result down to the nearest whole number

>x = 15
x//=2
print(x)

### 6.判別
> x = 5
print(x > 3 and x < 10)
#returns True because 5 is greater than 3 AND 5 is less than 10