Python Nested if Statements It is possible to include anifstatement inside anotherifstatement. For example, number =5# outer if statementifnumber >=0:# inner if statementifnumber ==0:print('Number is 0')# inner else statementelse:print('Number is positive')# outer else statementelse:print(...
>>> test = 'test' >>> _a_ = 1 >>> 123c = 10 File "<stdin>", line 1 123c = 10 ^ SyntaxError: invalid syntax >>> 这里Python解释器返回了SyntaxError: invalid syntax这个无效语法的错误提示,告诉你123c为无效的变量名。这也是使用解释器来学习Python的优势,代码里出了任何问题你都能得到“即时...
ifTrue:#此句会运行print("True1")#此句会运行print("True2")#此句会运行else:print("Else1")print("Else2")ifTrue:#此句会运行print("True1")#此句会运行print("True2")#此句会运行else:print("Else1")print("Else2")#此句会运行 多个语句构成代码组 compoundstatements 缩进相同的一组语句构成一...
This question is about theunderlying design decision, i.e.why it is usefulto be able to write this code. See alsoElse clause on Python while statementfor the specific question aboutwhat the syntax means. A common construct is to run a loop until something is found and then to break out...
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What Are Assertions Good For? When Not to Use Assertions? Understanding Python’s assert Statements The Syntax of the assert Statement The AssertionError Exception Exploring Common Assertion Formats Documenting Your Code With Assertions Debugging Your Code With Assertions An Example of Debugging With As...
if name is not None print(name) If语句漏掉了冒号,不符合Python的语法规范,所以程序就会报错 invalid syntax。 而异常则是指程序的语法正确,也可以被执行,但在执行过程中遇到了错误,抛出了异常,比如下面的3个例子: 代码语言:javascript 复制 10 / 0 Traceback (most recent call last): File "<stdin>",...
在Python 中,条件语句又叫作判断语句,由 if、 elif和 else 3 种语句组成,其中 if 为强制语句,可以独立使用,elif 和 else 为可选语句,并且不能独立使用。 判断语句配合布尔值,通过判断一条或多条语句的条件是否成立(True 或者 False),从而决定下一步的动作,如果判断条件成立(True),则执行 if 或 elif 语句下...
There is also syntax for branching execution based on several alternatives. For this, use one or more elif (short for else if) clauses. Python evaluates each <expr> in turn and executes the suite corresponding to the first that is true. If none of the expressions are true, and an else...
result = getString(argument_x) print result # it returns "PASS" if result ="PASS" When I try to launch it, it shows an error for the last line: SyntaxError: invalid syntax python syntax if-statement Share Improve this question Follow edited Dec 30, 2015 at 17:42 octopusgrabbus...