# python程式與資安實務

## :memo: Where do I start?

### :pushpin: 01-1變數
程式中的變數主要用於儲存使用者輸入資料，並隨程式執行，其儲存內容亦會隨之改變，故稱之為變數。
1. 變數命名規則
* 由**英文**、**數字**、**底線**組成
* ==不==得以==數字==開頭
* 不能與Python內建的保留字相同
2. 變數指派語法：==變數名稱 = 指派值==
* 範例：==a, b = 3.14, “TAINAN”==
* 說明：a指派為3.14(浮點數)，b指派為TAINAN(字串)

### :pushpin:01-2 輸入輸出
使用Python內建函數
:memo:輸入 input()
:memo:輸出 print()
1. 輸入語法：==變數 = input( [提示字串] )==
* 範例：==a = input()==
* 說明：將使用者輸入資料存於變數 a
* 註：input() 讀入含空白的整行文字
**若要轉整數，可使用 int() 函數**
如：==a = int( input() )==
2. 輸出語法：==print( [項目1, 項目2, ...] )==
* 範例：==print(a)==
* 說明：將變數 a 內容印出，印完換行

### :pushpin:01-3 運算子
俗稱運算符號，區分為
:memo: 算術運算子
:memo: 關係運算子
:memo: 邏輯運算子
:memo: 運算式規則：變數 = 運算式

運算式規則：==變數 = 運算式==
範例：==sum = ((a+b)*3+c*4) / 10==
說明：將等號右邊結果存於變數 sum
算術運算子：==+, -, *, /, %, //, **==
關係運算子： >, <, >=, <=, ==, !=
邏輯運算子：==and, or, not==

| 算術運算子 | 意義 | 關係運算子 | 意義 |
| ---------- | -------- |:----------:|:----:|
| ＋ | 加 |> | 大於 |
| - | 減 | < | 小於 |
| * | 乘 | >= | 大於等於 |
| / | 除 | <= |小於等於 |
| % | 餘數運算 | == | 等於（比較） |
| // | 商數運算 | != | 不等於 |
| ** | 指數運算 | | 大於 |

### if用法
％：除取於
- [ ] 小數可以用嗎？
- [x] 3%5=3

if(80>a>=70)
- [x] python
- [ ] c/c++
因為c++會先執行80>a執行出的結果為0或1最後結果不成立

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