>>> string = 'python' >>> string[::1] # 步进为1 'python' >>> string[::2] # 步进为2, [0, 0+2, 0+2+2...] 'pto' >>> string[::-1] #当步进<0时,开始缺省值-1,结束缺省值为-len(string)-1,此处步进-1,开始结束均缺省,则相当于把字符串倒了过来。 'nohtyp' >>> string[:...
1 class str(basestring): 2 """ 3 str(object='') -> string 4 5 Return a nice string representation of the object. 6 If the argument is a string, the return value is the same object. 7 """ 8 def capitalize(self): 9 """ 首字母变大写 """ 10 """ 11 S.capitalize() -> str...
Users can use the If with not in Python to check whether the variable is empty or assigned with some values. This variable can be List, Tuple, Dictionary, String, Boolean, Set, etc. The Python if not statement helps users to implement logical decisions and returns thenegation value of the...
String【字符串】 Boolean【布尔类型】 True真(1), Flase假(0) None【空值】 list【列表】 类似c语言的数组 tuple【元组】 不可改变的列表 dict【字典】 set【集合】(不常用~~) bytes【字节】b'hello' 二、运算符和表达式 + - *【乘法】 /【除法】 %【求余,取模】 **【求幂,次方】 //【取整】 >...
Indentation in Python Python uses indentation to define a block of code, such as the body of anifstatement. For example, x =1total =0# start of the if statementifx !=0: total += xprint(total)# end of the if statementprint("This is always executed.") ...
Python Version History What is Python Programming Language? Advantages and Disadvantages of Python Python Data Types with Examples Python Arrays - The Complete Guide What is String in Python and How to Implement Them? Python Numbers - Learn How to Create Prime Numbers, Perfect Numbers, and Reverse...
1、python流程控制之if测试 A、python对象的特点--所有对象都支持比较操作 数字:通过相对大小进行比较 字符串:按照字典次序逐字进行比较 列表和元组:自左至右比较各部分内容 字典:对排序之后的(键、值)列表进行比较 B、python中真和假的含义 非零数字为真,否则为假 ...
一、python关键点 数据、函数、条件判断、循环 二、数据 1、字符串:string nameStr = '马云' 字符串合并: + 格式化字符串:%s str1 = ’我叫%s,我爹是%s‘ % ('王思聪',’王健林‘) 2、数值:number 1)整型: int 2)浮点型:float 3、容器:存放多个数据 ...
if not all(my_tuple): print('There is an empty string in the tuple.') ``` 在这个例子中,我们直接传递my_tuple作为参数给all函数。如果所有元素都不为空,则all函数将返回True,if not all将返回False,不会执行print语句。反之,如果任何一个元素为空,all函数将返回False,if not all将返回True,执行print...
The Pythonlen()is used to get the total number of characters present in the string and check if the length of the string is 0 to identify the string is empty. Actually, thelen()function returns the length of an object. The object can be a string, a list, a tuple, or other objects...