second_in_little_place = little_place.index('XiaoBao') #从小列表中取出值的位置 sum = place + second_in_little_place+1 #sun就是第二个相同值得位置(+1是因为小列表从位置零开始) print('xiaobao的位置是',first_place+1,sum) 统计某元素存在列表的个数: a.count
(3)字符串的查找:find和index str.find(s):从左至右查找str中是否含s,有则返回第一次出现s的索引位置,否则返回-1 str.index(x):从左至右查找是否含有x,有则返回第一次出现的索引位置,没有则抛出ValueError str.rfind()和str.rindex()就是从右至左查找。 22、函数变量的作用域 (1)局部变量、全局变量、...
print("second_lg_index_in_bgg_list",second_lg_index_in_bgg_list)print("sedcond lg:",a[second_lg_index_in_bgg_list])$ python list9.py1('first_lg_index', 3)('second_lg_index', 1)('second_lg_index_in_bgg_list', 3)('sedcond lg:', 'ligang') 1. 2. 3. 4. 5. 6. 7....
/usr/bin/pythonstr1="this is string example...wow!!!";str2="exam";printstr1.index(str2);printstr1.index(str2,10);printstr1.index(str2,40); 以上实例输出结果如下: 1515Traceback(most recent calllast):File"test.py",line8,inprintstr1.index(str2,40);ValueError:substringnotfound 3....
reverse 函数 与 substring_index 函数 select reverse(substring_index(reverse(substring_index((select dept_name from department where dept_no...=20862), '-', 2)), '-', 1)); select @a:=substring_index('信息平台事业部-企业运营平台部', '-', 2); SELECT reverse(substring_index...( (sele...
1 # index = index - 1 new_string += a_string[index] # new_string = new_string +...
Python中 reverse()是列表的内置方法,无参数,无返回值,reverse()会改变列表(原地反转),因此无需返回值。字典、元组、字符串不具有reverse()方法,如果调用将会返回一个异常. >>> help(list.reverse) Help on method_descriptor: reverse(...) L.reverse() -- reverse *IN PLACE* >>> l=[1,2,3,4,5]...
(str):b64='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'b=''key=''foriinrange(1,3):str=list(str)# 字符串是不能进行删除操作的所以要转换成列表ifstr[len(str)-i]=='=':str.remove('=')# 删除'='str=''.join(str)# 转换成字符串foriinstr:b+=format(b64.index(i),'...
However, it can see a list without element 3 and return False, as shown in the sample output: test begin... 0 found bug: [False] found bug: [False] 1000 We observed the same behavior with operations count and index executing concurrently with reverse on the same list, I'll add a ...
Python Code: # Define a function named 'string_reverse' that takes a string 'str1' as inputdefstring_reverse(str1):# Initialize an empty string 'rstr1' to store the reversed stringrstr1=''# Calculate the length of the input string 'str1'index=len(str1)# Execute a while loop until...