python使用try函数详解

try:
    # 尝试执行的代码块
except ExceptionType:
    # 发生异常时执行的代码块
else:
    # 未发生异常时执行的代码块
finally:
    # 无论是否发生异常都会执行的代码块

try:
    num = int("abc")
except ValueError:
    print("输入的不是有效数字")

try:
    result = 10 / 0
    num = int("abc")
except ZeroDivisionError:
    print("除数不能为零")
except ValueError:
    print("输入的不是有效数字")

try:
    num = int("123")
except ValueError:
    print("输入的不是有效数字")
else:
    print(f"转换后的数字是: {num}")

try:
    file = open("example.txt", "r")
    content = file.read()
except FileNotFoundError:
    print("文件未找到")
finally:
    file.close()
    print("文件已关闭")

try:
    result = 10 / 0
except Exception as e:
    print(f"发生异常: {e}")

class CustomError(Exception):
    pass

try:
    raise CustomError("这是一个自定义异常")
except CustomError as e:
    print(f"捕获到自定义异常: {e}")

try:
    try:
        num = int("abc")
    except ValueError:
        print("内层捕获到 ValueError")
    result = 10 / 0
except ZeroDivisionError:
    print("外层捕获到 ZeroDivisionError")

try:
    with open("example.txt", "r") as file:
        content = file.read()
except FileNotFoundError:
    print("文件未找到")