If statement, without indentation (will raise an error): a =33 b =200 ifb > a: print("b is greater than a")# you will get an error Try it Yourself » Elif Theelifkeyword is Python's way of saying "if the prev
# 错误示例for i in range(100): for j in range(100): print(i, j) # 这将执行10000次，可能效率低下# 正确示例if some_condition: for i in range(100): for j in range(100): print(i, j) # 仅在需要时使用嵌套循环 7.循环与函数的结合不当：错误：在循环中调用函数时，没有正确传递参数...
if<condition>:<statement><statement> < condition > 是条件表达式,基本格式为< expr >< relop >< expr >;< statement >是语句主体。判断条件如果为真(True)就执行语句,如果为假(False)就跳过语句,执行下一条语句。条件判断通常有布尔表达式(True、False)、关系表达式(>、<、>=、<=、= =、!=)和逻辑运算...
The expression determines whether 10 is greater than five. Since it is, the indented statement runs, and "10 greater than 5" is output. Then, the unindented statement, which is not part of the if statement, is run, and "Program ended" is displayed. Result: >>> 10 greater than 5 Pro...
If <expr> is false, then <statement> is skipped over and not executed. Note that the colon (:) following <expr> is required. Some programming languages require <expr> to be enclosed in parentheses, but Python does not. Here are several examples of this type of if statement: Python >...
在Python中，可以使用多个条件判断符号来组合多个条件。常用的多个条件判断符号包括逻辑与（and）、逻辑或（or）和逻辑非（not）。例如：if condition1 and condition2:statement1 elif condition3 or condition4:statement2 else:statement3 在以上的代码中，如果condition1和condition2都成立，则执行statement1；如果...
deff(x):returnx,x**2# rightofunary statement 1.2 命名的元组 命名的元组(namedtuple)与普通元组一样,有相同的表现特征,其添加的功能就是可以根据名称引用元组中的项。 collections模块提供了namedtuple()函数,用于创建自定义的元组数据类型。该函数的第一个参数是想要创建的自定义元组数据类型的名称,第二个参数是...
IfStatement- condition: bool+execute()+executeElse()ComparisonExpression- left_operand- right_operand+evaluate()NotExpression- expression+evaluate() 以上是一个使用mermaid语法标识的类图,展示了if语句的类结构。IfStatement类表示if语句的结构,包含一个判断条件condition,并定义了执行if块和else块的方法。Comparison...
The else statement executes if the condition in the if statement evaluates to False.Syntaxif condition: # body of if statement else: # body of else statementHere, if the condition inside the if statement evaluates toTrue - the body of if executes, and the body of else is skipped. False ...
ifcondition_1: statement_block_1elifcondition_2: statement_block_2else: statement_block_3 循环语句 Python 中的循环语句有 for 和 while。 break 语句可以跳出 for 和 while 的循环体。 continue 语句跳过当前循环继续进行下一轮循环。 while循环