Or if I wanted to access say the first or the last element of that string,I can use my common generic sequence operations. 我也会做切片。 I can also do slicing. 所以我可能想从字符串的最开始开始,取前三个对象。 So I might want to start from the very beginning of the string and take...
string.index(str, beg=0, end=len(string))跟find()方法一样,只不过如果str不在 string中会报一个异常. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>mystr.index("how")12>>>mystr.index("how",20,30)Traceback(most recent call last):File"<stdin>",line1,in<module>ValueError:subst...
print([1,2,3] + [4,5,6]) # 组合 [1,2,3,4,5,6] print(['Hello'] *4) # 重复['Hello', 'Hello', 'Hello', 'Hello']print(3in[1,2,3]) # 某元素是否在列表中 True # 列表的访问 abcd_list= ['a','b','c','d'] print(abcd_list[1]) # b print(abcd_list[-2]) #c...
不可变数据(3 个):Number(数字)、String(字符串)、Tuple(元组); 可变数据(3 个):List(列表)、Dictionary(字典)、Set(集合)。 此外还有一些高级的数据类型,如: 字节数组类型(bytes)。Number(数字)Python3 支持 int、float、bool、complex(复数)。 在...
importjava.util.Scanner;publicclassHappyProgram{publicstaticvoidmain(String args[]){Scannerinput_a=newScanner(System.in); System.out.print("Enter a number: ");intYourNumber=input_a.nextInt();if(YourNumber >10) System.out.println("Your number is greater than ten") ;if(YourNumber <=10) ...
Return a string which is the concatenation of the strings in the iterable. The separator between elements is S. li=['apple','peach','banana','peach','pear']# 形参为可迭代对象 1. sep=','# 指定逗号为连接符 sep.join(li)# 语法: 连接符.join(可迭代对象), 即将可迭代对象,有(分隔符)连...
Traceback (most recent call last): File "", line 1, in <module> print(int(3, 10)) TypeError: int() can't convert non-string with explicit base 如果是带参数 base 的话,x 要以字符串的形式进行输入,比如: print(int("3", 10)) 执行以上代码,输出结果为: 3 (2)float() 函数 float(...
combined_string = string1 + ' ' + string2 # 结果为 'Hello World' (2)重复(Repetition) 使用*运算符可以重复一个字符串指定的次数。 repeated_string = 'a' * 5 # 结果为 'aaaaa' (3) in的用法 使用in关键字可以检查一个字符串是否包含另一个子字符串。 substring = 'Python' substring in string...
# Consume *iterable* up to the *start* position.for i, element in zip(range(start), iterable):passreturntry:for i, element in enumerate(iterable):if i == nexti:yield element nexti = next(it)except StopIteration:# Consume to *stop*.for i, element in zip(range(i + 1, stop), ...
last_element = my_list[-1] print(last_element) #输出: 5 my_string = "Hello" last_char = my_string[-1] print(last_char) #输出: o 2.反向遍历列表或字符串: my_list = [1, 2, 3, 4, 5] for element in reversed(my_list): print(element) my_string = "Hello" for char in rever...