Python：bdb 库高级用法举例和应用详解

import bdb

class SimpleDebugger(bdb.Bdb):
    def user_call(self, frame, args):
        # 当函数或方法被调用时触发
        print(f"Call to function {frame.f_code.co_name} at {frame.f_lineno}")
        self.set_trace(frame)  # 开始调试

    def user_line(self, frame):
        # 当调试停止在某行时触发
        print(f"Stopped at line {frame.f_lineno} in {frame.f_code.co_name}")
        self.set_continue()  # 继续执行

def example_function():
    x = 10
    y = 20
    print(x + y)

# 创建一个简单调试器实例并设为当前调试器
debugger = SimpleDebugger()
debugger.set_step()  # 设置单步执行模式
debugger.run('example_function()')  # 开始调试目标函数

import bdb

class BreakpointDebugger(bdb.Bdb):
    def __init__(self):
        super().__init__()
        self.breakpoints = set()  # 断点集合

    def user_call(self, frame, args):
        self.set_trace(frame)

    def user_line(self, frame):
        lineno = frame.f_lineno
        if lineno in self.breakpoints:
            print(f"Breakpoint at line {lineno} in {frame.f_code.co_name}")
            self.set_trace()  # 触发断点时暂停
        else:
            self.set_continue()  # 没有断点则继续执行

    def set_breakpoint(self, lineno):
        self.breakpoints.add(lineno)  # 设置断点

def example_function():
    a = 1
    b = 2
    c = a + b
    print(c)

debugger = BreakpointDebugger()
debugger.set_breakpoint(6)  # 设置断点在第6行
debugger.run('example_function()')  # 开始调试目标函数

import bdb

class TraceDebugger(bdb.Bdb):
    def user_call(self, frame, args):
        print(f"Calling function {frame.f_code.co_name} at line {frame.f_lineno}")
        self.set_trace(frame)

    def user_return(self, frame, return_value):
        print(f"Returning from {frame.f_code.co_name} at line {frame.f_lineno} with return value: {return_value}")
        self.set_continue()

def example_function():
    def add(x, y):
        return x + y
    result = add(3, 5)
    print(result)

debugger = TraceDebugger()
debugger.run('example_function()')  # 开始调试目标函数