ifTrue:print("Answer")print("True")else:print("Answer")print("False")#缩进不一致,会导致运行错误IndentationError:unindent doesnotmatch any outer indentation level 示例 ifTrue:#此句会运行print("True1")#此句会运行print("True2")#此句
Anifstatement can have an optionalelseclause. Theelsestatement executes if the condition in theifstatement evaluates toFalse. Syntax ifcondition:# body of if statementelse:# body of else statement Here, if theconditioninside theifstatement evaluates to True- the body ofifexecutes, and the body ...
这里statement1和statement2两个变量都为字符串,但是quantity这个变量为整数,因此print statement1 + quantity + statement2会报错TypeError: cannot concatenate 'str' and 'int' objects, 提示不能将字符串和整数拼接合并。解决的办法是使用str()这个函数将quantity从整数转化为字符串,举例如下: ...
def maximum(*numbers): #The parameters are collected into a tuple called numbers if len(numbers) == 0: return None else: maxnum = numbers[0] for n in numbers[1:]: if n > maxnum: maxnum = n return maxnum print(maximum(3, 2, 8)) # 8 print(maximum()) # None print(maximum(...
http://www.runoob.com/python3/python3-basic-syntax.html 1. if判断条件: 执行语句……else: 执行语句…… flag=False name='luren'ifname =='python': # 判断变量否为'python'flag=True # 条件成立时设置标志为真 print'welcome boss'# 并输出欢迎信息else: ...
In this article, I'll show you - through a few practical examples - how to combine a for loop with another for loop and/or with an if statement!
The proper way to catch multiple exceptions in an except statement is to specify the first parameter as a tuple containing all exceptions to be caught. Also, for maximum portability, use the as keyword, since that syntax is supported by both Python 2 and Python 3: >>> try: ... l = ...
Python语言比起C++、Java等主流语言,语法更简洁,也更接近英语,对编程世界的新人还是很友好的,这也是其显著优点。最近总有人问我Python相关的问题,这些问题也偏基础,自古有句话,授人以鱼不如授人以渔,刚好趁五一时间总结了几篇Python的知识点,帮助小伙伴成功入坑Python,将这门工具语言顺利掌握起来。 Python常用数据...
The dictionary has_key method allows us to query the existence of a key and branch on the result with a Python if statement: >>> D.has_key('f') False >>> if not D.has_key('f'): print 'missing' missing I’ll have much more to say about the if statement and statement syntax ...
将解析树转换为抽象语法树(Abstract Syntax Tree) 将抽象语法树转换到控制流图(Control Flow Graph) 根据流图将字节码(bytecode)发送给虚拟机(eval) 我们平常在python开发环境中编写代码时,IDE会提示各种编写过程中的语法错误,本质上是代码静态检查,对代码的内容和结构进行解析和分析,类似编译过程中的前三个步骤,让...