4. Raising ValueError in a function Here is a simple example where we are raising ValueError for input argument of correct type but inappropriate value. import math def num_stats(x): if x is not int: raise TypeError('Work with Numbers Only') if x < 0: raise ValueError('Work with Posit...
raise # 重新抛出原始异常 ,以便上层处理3.4.2 使用raise from保留原始堆栈跟踪 Python 3 引入了raise from语法,允许在抛出新异常时引用原始异常,保留完整的堆栈跟踪。 try: risky_operation() except SomeException as original_error: new_error = NewError("基于原有异常的新描述") raise new_error from origin...
def function_might_raise_error(n): if n < 0: raise ValueError("n must be non-negative") return sum(range(n)) try: function_might_raise_error(-1) except ValueError: pass # Handled exception outside 输出示例: An error occurred in function_might_raise_error: n must be non-negative 通过...
如果可以选择Python已有的内置的错误类型(比如ValueError,TypeError),尽量使用Python内置的错误类型。 最后,我们来看另一种错误处理的方式: defbar():try: foo('0')exceptValueError as e:print('ValueError!')raise 在bar()函数中,我们明明已经捕获了错误,但是,打印一个ValueError!后,又把错误通过raise语句抛出去了...
defis_prime(number):ifisinstance(number,float):raiseTypeError(f"Only integers are accepted:{number}")ifnumber<2:raiseValueError(f"Only integers above 1 are accepted:{number}")forcandidateinrange(2,int(sqrt(number))+1):ifnumber%candidate==0:returnFalsereturnTrue ...
raise ValueError # [''] raise SPSSError(retcode="6001") or raise SPSSError(retcode=6001) or raise SPSSError except Exception as e: e = FormatErrorCode(e) print(e) # ['4999', 'Unknown Error!!!'] example() #>>> (5001, '数据表已经存在')"""def__init__(self, msg=None, retcode...
def ask_ok(prompt, retries=4, reminder='Please try again!'): while True: ok = input(prompt) if ok in ('y', 'ye', 'yes'): return True if ok in ('n', 'no', 'nop', 'nope'): return False retries = retries - 1 if retries < 0: raise ValueError('invalid user response') ...
For example, say that you’re coding a gradebook app and need to calculate the students’ average grades. You want to ensure that all the grades are between 0 and 100. To handle this scenario, you can create a custom exception called GradeValueError. You’ll raise this exception if a ...
理论讲解: 有时候内置的异常类型不足以描述特定的情况。这时可以使用 raise 语句抛出自定义异常,使错误信息更具描述性。 示例代码: classCustomError(Exception): def __init__(self, message): self.message = message super().__init__(self.message) def validate_age(age): if age < 0: raise CustomEr...
raise 异常抛出语句,可用于代码测试,但出错就会中断代码运行。 def validate_email(email):if "@" not in email:raise ValueError("无效的电子邮件地址!")else:print("电子邮件地址有效")validate_email("test@example") # 输出: 电子邮件地址有效validate_email("test") # 抛出ValueError: 无效的电子邮件地址!