Python入门基础知识总结

# Python入门基础知识的摘要和代码示例
 
# 1. 打印文本到控制台
print("Hello, World!")
 
# 2. 变量和数据类型
# 整数
int_number = 10
print(int_number)
# 浮点数
float_number = 3.14
print(float_number)
# 字符串
str_text = "Hello Python!"
print(str_text)
# 布尔值
bool_value = True
print(bool_value)
 
# 3. 运算符和表达式
num1 = 5
num2 = 3
sum_result = num1 + num2
print(sum_result)  # 8
 
# 4. 控制流程 - 条件语句
age = 18
if age >= 18:
    print("You are old enough to vote!")
else:
    print("Sorry, you are too young to vote.")
 
# 5. 控制流程 - 循环
for i in range(5):  # 从0到4
    print(i)
 
# 6. 函数定义和使用
def greet(name):
    print(f"Hello, {name}!")
 
greet("Alice")  # 输出: Hello, Alice!
 
# 7. 列表和字典
# 列表
fruits = ["apple", "banana", "cherry"]
print(fruits)
# 字典
person = {"name": "Bob", "age": 25}
print(person)
 
# 8. 异常处理
try:
    num = int("not_a_number")
except ValueError:
    print("Invalid input, expected a number.")
 
# 9. 类和对象
class Car:
    def __init__(self, make, model):
        self.make = make
        self.model = model
 
    def describe_car(self):
        print(f"This car is a {self.make} {self.model}.")
 
my_car = Car("Toyota", "Corolla")
my_car.describe_car()  # 输出: This car is a Toyota Corolla.

这段代码展示了Python的基础知识，包括变量、数据类型、运算符、控制流程、函数、列表、字典、异常处理、类和对象。每一部分都包含了简单的代码示例来帮助初学者理解和掌握这些基础概念。