Python Python 语法

[Yann]

1.变量声明和使用：

name = "John"
age = 25
print("My name is", name, "and I am", age, "years old.")

2.条件语句（if-else）：

score = 85
if score >= 60:
    print("You passed the exam!")
else:
    print("You failed the exam.")

3.循环语句（for）：

for i in range(1, 6):
   print("Number:", i)

4.列表（List）声明和访问：

fruits = ["apple", "banana", "orange"]
print(fruits[0])  # 输出 "apple"

5.函数声明和调用：

def greet(name):
   print("Hello,", name)

greet("Alice")  # 输出 "Hello, Alice!"

6.类声明和实例化：

class Person:
    def __init__(self, name):
        self.name = name

   def greet(self):
       print("Hello, my name is", self.name)

person = Person("John")
person.greet() # 输出 "Hello, my name is John!"

7.文件导入和模块使用：

# 文件1.py
variable = "Hello from file 1!"

# 文件2.py
from 1 import variable
print(variable)  # 输出 "Hello from file 1!"

8.异常处理：

def divide(numerator, denominator):
    if denominator == 0:
        raise Exception("Division by zero error!")
    return numerator / denominator

try:
   print(divide(10, 0))
except Exception as e:
   print("Error:", str(e))