# Initializing variables x = 10 y = 20 # Asserting a boolean condition assert x < y # Printing the values of x and y print("x =", x) print("y =", y) 输出 x = 10 y = 20 检查变量类型的断言 在本例中,assert语句检查变量a和b的类型是否分别为str和int。如果任何断言失败,它将引发...
2.4 assert 语句 2.5 else 和 finally 分支 3 自定义异常对象 4 调试 4.1 使用 print() 函数 4.2 使用 pdb 模块 4.3 使用 IDE 的调试功能 参考资料:LQLab:Python 完全自学教程 — LQLab (lqpybook.readthedocs.io) 1 错误 在Python 语言中,导致程序不能运行的原因通常划分为两类:错误和异常。 错误可以分...
这个属性是一个字符串,它包含了描述对象的注释,python称之为文档字符串或 docstring。文档字符串通常包含嵌入的换行 \n ,如何要使其变得易读,可以print出来>>>sys.__doc__ "This module provides access to some objects used or maintained by the\ninterpreter and to functions that interact stronglywiththe i...
In this situation, the function won’t check the input value for discount, possibly accepting wrong values and breaking the correctness of your discount functionality. In general, you can write assert statements to process, validate, or verify data during development. However, if those operations ...
a = [] print(avg_value(a)) AssertionError: No values The assert is pretty useful to find bugs in the code. Thus, they can be used to support testing. Conclusion We have covered how try, except, and assert can be implemented in the code. They all come in handy in many cases beca...
方法二:用断言assert代替打印print() >>>deffoo(s): ... n=int(s) ...assertn != 0,'n的值是0!'...return10 /n ...>>>defmain(): ... foo('0') ...>>>main() Traceback (most recent call last): File"<stdin>", line 1,in<module>File"<stdin>", line 2,inmain ...
2.断言(assert) 3.日志模块(logging) 4.修改之前的车票信息查询,把日志模块、异常处理加进去 1.异常处理 代码如下: 语法: try: pass #可能出现异常的语句 except Exception as e: #Exception 全部异常的通称 print(e) finally: #可选项,不管有没有异常,finally里面的语句都执行 ...
() - start print('{} took {:.3f} seconds\n\n'.format(name, duration))fordinresult:assert-1<= d <=1," incorrect values"if__name__ =="__main__": print('Running benchmarks with COUNT = {}'.format(COUNT)) test(lambdad: [tanh(x)forxind],'[tanh(x) for x in d] (...
python 调试: print / assert / logging / pdb 先举例最为常见的调试方法是:print def foo(s): n = int(s) print('>>> n = %d' % n) return 10 / n def main(): foo('0') main() 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
[('a', 1), ('b', 2)] >>> for k in d: print k, d[k] a1 b2 >>> for k, v in d.items(): print k, v a1 b2 对于⼤大字典,调⽤用 keys(),values(),items() 会构造同样巨⼤大的列表.建议⽤用迭代器替代,以减 少内存开销. 38 >>> d = {"a":1, "b":2} >>> ...