# This last statement is always executed, after the if statement is executed cmp() 函数则是相当于 <,==,> 但是在 Python3 中,cmp() 函数被移除了,所以我以后还是避免少用这个函数。 >>> x='a' >>> x+'b' is 'ab' False >>> x+'b' == 'ab' True >>>
可以看出内容相同的字符串实际上是同一个对象(Java 中直接赋值的字符串也可用 == 来判断,但是使用 new 实例化的对象则需要使用equals(String s) 来判断)。
or giving the user the ability to define both the iteration step and halting condition (as C), Python’s for statement iterates over the items of any sequence (a list or a string), in the
逻辑AND–如果两个值都为真(或在许多情况下为非零),则返回真值: a =0b =8if(aandb):print'true'else:print'false'`False` 或者 逻辑OR–如果任一值为真,则返回真值: a =0b =8if(aorb):print'true'else:print'false'`True` 没有 逻辑非–反转运算符。真变假,假变真: a =0b =8ifnot(aandb...
1.有时候两个字符串打印出来看着⼀样，但是判断却是False？如果两个字符串末尾有其他符号，⽐如回车‘\n'，print的时候⽆法发现的，所以需要strip：a=a.strip()b=b.strip()if a==b:print "True"2.有时候==判断是 True ，is 判断却是 False?这是因为两个字符串来⾃不同的内存块，内存地址不⼀...
Note python has this really weird error if you define local variable in a function same name as the global variable, program will promptUnboundLocalError. child class object overrides parent class methods input: classfruit:defprint(self):print('a')defeat(self):print('b')classapple(fruit):defpr...
'equals', x, '*', n//x) ... break ... else: ... # 循环中没有找到元素 .....
2.1.3 if 2.1.4 switch case 2.1.5 三目运算符 2.1.6 break、continue 2.2 Java 关键字 3. 类、实例 3.1 类 3.1.1 修饰符 3.1.2 Number & Math 类 3.1.3 String 类 判断String相等 类方法 转换 分割 查找 StringBuilder/StringBuffer 3.2 实例(对象) ...
When you start working with other people’s code you will run into theif __name__ == '__main__'statement at the end of the Python code. What does it mean? if __name__ == ‘__main__’ in Python if name equals mainis a construct that uses a control flow statement to allow ...
Learn how to use Python's if __name__ == "__main__" idiom to control code execution. Discover its purpose, mechanics, best practices, and when to use or avoid it. This tutorial explores its role in managing script behavior and module imports for clean an