参考资料:https://stackoverflow.com/questions/48076780/find-starting-and-ending-indices-of-list-chunks-satisfying-given-condition 1#列表中找到符合要求的数的起始索引和结尾索引2deffirst_and_last_index(li, lower_limit=0, upper_limit=3):3result =[]4foundstart =False5foundend =False6startindex =07...
IndexError: list index out of range 其中a[len(a)-1]等同于a[-1],a[-len(a)]等同于a[0],分别表示序列的最后一个和第一个对象。 当使用冒号(:)对序列进行切片取值时,你所输入的无论是start_index或者end_index,都不必局限于 -len(a) 和 len(a)-1 之间,因为只有当你输入的索引号处于这个区间时...
Negative Indexing: Python also supports negative indexing, which starts from the end of the list. This means the last element can be accessed with-1, the second to last with-2, and so forth. In thecolorslist,colors[-1]returns'blue', the last element. ...
position (0th index), looking for the element you are searching for. When it finds the value - it returns the position and exits the system. However, this is not too efficient when going through a large list, and you need to get the position of something towards the end of the list....
number.index(9) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 9 index函数还可以指定查找的起止索引位置:index(x,start,stop) x: 查找的对象。 start:可选,查找的起始位置。 end:可选,查找的结束位置。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 number.index(7,8,16) # 查找7的第一...
end (optional) - search the element up to this index Return Value from List index() The index() method returns the index of the given element in the list. If the element is not found, a ValueError exception is raised. Note: The index() method only returns the first occurrence of the...
在其中的运行过程中会出现list index out of range的错误,这时我们就要进行分析环节了。 解决方案 此处我们要分析list index out of range的错误是一个什么样的错误,经过以上代码的分析我们得知,该错误是因为我们所取的值已经超过了列表的范围所导致的错误,这时,...
l[3] # 抛出异常IndexError,该行代码同级别的后续代码不会运行 print('2222222222') xxx print('33333333') dic={'a':1} dic['a'] except IndexError as e: print('异常的信息: ',e) print('end...') 1. 2. 3. 4. 5. 6. 7. 8...
pop(index)) # 对选中的红色球排序 selected_balls.sort() # 输出选中的红色球 for ball in selected_balls: print(f'\033[031m{ball:0>2d}\033[0m', end=' ') # 随机选择1个蓝色球 blue_ball = random.randrange(1, 17) # 输出选中的蓝色球 print(f'\033[034m{blue_ball:0>2d}\033[0m'...
x = fruits.index("cherry") Try it Yourself » Definition and Usage Theindex()method returns the position at the first occurrence of the specified value. Syntax list.index(elmnt,start,end) Parameter Values ParameterDescription elmntRequired. Any type (string, number, list, etc.). The element...