# Akuli-python-tutorial-learning

**Repository Path**: shanghai_sansi_co_ltd/Akuli-python-tutorial-learning

## Basic Information

- **Project Name**: Akuli-python-tutorial-learning
- **Description**: 入门学习
- **Primary Language**: Python
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 2
- **Forks**: 0
- **Created**: 2020-05-02
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Akuli-python-tutorial-learning

# 1 介绍
python入门学习

# 2 python的常规输出
1.单纯输入字符串的报错
```python
>>> hello

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-41-f572d396fae9> in <module>
----> 1 hello

NameError: name 'hello' is not defined
```
2.输入数字，输出数字
```python
>>>123
123
```
3.输入组合的数字，没有报错，输出了数字集合。
```python
>>>3,4
(3, 4)
```
4.带双引号输入字符“hello world”，输出带单引号字符。
```python
>>>"hello world"
'hello world'
```
5.也可以输出带单引号的字符,带双引号输出
```python
>>>"Today's sunny"
"Today's sunny"
```
6.可以输出算数，注意^在python中做XOR运算
```python
>>>1+2
8
>>>3*4
12
>>>5/6
0.8333333333333334
>>>5-6
-1
>>>5**2
25
>>>2^7
5
```
# 3 变量、布尔值、空
1.变量

变量用于传递数值或字符串，一个变量可以被多次赋值，重复赋值，但是只能赋予一个值。

变量区分大小写。

程序语言中的关键字不能被创建为变量，如if，also，for……

变量名称有讲究，有意义便于他人读懂程序为优。

```python
>>>a=1
>>>a
1

>>>if=1
if

  File "<ipython-input-75-063f749f6da3>", line 1
    if=1
      ^
SyntaxError: invalid syntax

>>>a="hello";b=2
>>>a,b
('hello', 2)

>>>Think=1;tTink=2;thInk=3
>>>Think,tTink,thInk
(1, 2, 3)
```
2.布尔值
布尔值有两个，true和false。通过“==”比较获得。

实际上输入“a==1”与“(a==1) == True”同意。
```python
>>>a=1
>>>a == 1
True
>>>a==2
False
```
3.None

空值，无，None，也有其用场。
```python
>>>thingy = None
>>>thingy

>>>print (thingy)
None
```
4.其他比较
| Usage     | Description                       | True examples         |
|-----------|-----------------------------------|-----------------------|
| `a == b`  | a is equal to b                   | `1 == 1`              |
| `a != b`  | a is not equal to b               | `1 != 2`              |
| `a > b`   | a is greater than b               | `2 > 1`               |
| `a >= b`  | a is greater than or equal to b   | `2 >= 1`, `1 >= 1`    |
| `a < b`   | a is less than b                  | `1 < 2`               |
| `a <= b`  | a is less than or equal to b      | `1 <= 2`, `1 <= 1`    |

与、或

| Usage     | Description                               | True example                      |
|-----------|-------------------------------------------|-----------------------------------|
| `a and b` | a is True and b is True                   | `1 == 1 and 2 == 2`               |
| `a or b`  | a is True, b is True or they're both True | `False or 1 == 1`, `True or True` |


```python
>>>1==1 and 2==2
True
>>>1 > 1 and 2==2
False
```