JAX study notes[9]

1. notation

# 单行注释

2. variable

x = 10  # 整数
y = 3.14  # 浮点数
name = "Alice"  # 字符串

3. the number type

# 数字
int_num = 10
float_num = 3.14

# 字符串
str_val = "Hello, World!"

# 列表
list_val = [1, 2, 3, 4, 5]

# 元组
tuple_val = (1, 2, 3, 4, 5)

# 集合
set_val = {1, 2, 3, 4, 5}

# 字典
dict_val = {"name": "Alice", "age": 25}

4. control flow

# if 语句
if x > 10:
    print("x 大于 10")
elif x == 10:
    print("x 等于 10")
else:
    print("x 小于 10")

# for 循环
for i in range(5):
    print(i)

# while 循环
while x < 10:
    x += 1
    print(x)

5. function

# 定义函数
def greet(name):
    return f"Hello, {name}!"

# 调用函数
print(greet("Alice"))

# 带默认参数的函数
def greet(name="World"):
    return f"Hello, {name}!"

# 调用函数
print(greet())
print(greet("Alice"))

6. class and object

# 定义类
class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def greet(self):
        return f"Hello, my name is {self.name} and I am {self.age} years old."

# 创建对象
person = Person("Alice", 25)

# 调用方法
print(person.greet())

7. handle the exception
   try:
   result = 10 / 0
   except ZeroDivisionError:
   print(“除数不能为零”)
   finally:
   print(“执行完毕”)

8. moudle and package

# import moudle
import math

using function from moudle

print(math.sqrt(16))

import the special funtion

from math import sqrt

apply the function imported from the library

print(sqrt(16))

9. control the file

# open the file
file = open("example.txt", "r")

# read the file 
content = file.read()
print(content)

# close the file
file.close()

write into file

file = open("example.txt", "w")
file.write("Hello, World!")
file.close()

10. the standard library

using os module

import os

# to ask for the current work directory

```python
print(os.getcwd())

using sys module

import sys

to get the arguments of sys

print(sys.argv)

references

https://www.python.org/