statement(s) exceptExceptionType: # 当捕获到指定类型的异常时执行的代码块 statement(s) try代码块中放置可能会抛出异常的代码。当执行try代码块时,如果发生异常,Python 会立即停止执行try代码块中剩余的代码,并跳转到except子句。 ExceptionType是要捕获的异常类型,如ZeroDivisionError、FileNotFoundError等。如果抛出...
pdb模块中的调试语句块的函数及参数原型为: run(statement[,globals[, locals]]) statement 要调试的语句块,以字符串的形式表示 globals 可选参数,设置statement运行的全局环境变量: locals 可选参数,设置statement运行的局部环境变量。 例子: import pdb pdb.run(""" for i in range(3): print(i) """) 1...
assert statement, otherwise-information 1. 一个例子: def my_print(n): assert n != 0, "N equals to 0!" print(n) my_print(0) # AssertionError: N equals to 0! 1. 2. 3. 4. 在运行Python程序时,使用 -O 参数可以关闭断言,使用后,所有的assert会被作为pass处理: python -O main.py log...
try:# statement(s)exceptIndexError:# statement(s)exceptValueError:# statement(s) 示例:在Python中捕获特定异常 # Program to handle multiple errors with one# except statement# Python 3deffun(a):ifa<4:# throws ZeroDivisionError for a = 3b=a/(a-3)# throws NameError if a >= 4print("Value ...
For instance, we may be interested in only a particular type of error or want to handle different types of error differently. The type of error can be specified with the except statement. Consider the following code that asks user for a number from a list. Then, it returns a name from ...
问无法连接到数据库错误，当在python中实现try / except语句时EN在Python中，try...except语句是一种...
This statement will raise an error, becausexis not defined: print(x) Try it Yourself » Many Exceptions You can define as many exception blocks as you want, e.g. if you want to execute a special block of code for a special kind of error: ...
Theraisestatement creates aValueErrorfor negative ages. This propagates the error to be caught in the enclosingtry-exceptblock. Nested Try Blocks Handle exceptions at different levels using nestedtrystatements. nested_try.py try: try: result = 10 / 0 ...
Python中的try-finally >>>try:...raiseKeyboardInterrupt...finally:...print('Goodbye, world!')...Goodbye, world! KeyboardInterrupt Traceback (most recent call last): File "<stdin>", line 2, in <module> A finally clause is always executed before leaving the try statement, whether an ...
Import path import python Direct supertypes @py_Try Stmt Indirect supertypes @py_ast_node @py_stmt AstNode AstNode_ Stmt_ Known direct subtypes Try Predicates getAFinalstmt Gets a finally statement of this try statement. getAHandler Gets an exception handler of this try statement. getAStmt ...