Theindex()method doesn’t support reverse searching. To find thelast occurrence, reverse the list manually or use a comprehension: my_list=[1,2,3,2,1]last_index=len(my_list)-1-my_list[::-1].index(2)print(last_index)# Output: 3 ...
index = alphabets.index('i',4)# 6 print('The index of i:', index)# 'i' between 3rd and 5th index is searched index = alphabets.index('i',3,5)# Error! print('The index of i:', index) Output The index of e: 1 The index of i: 6 Traceback (most recent call last): File...
"char="o"try:last_index=str.rindex(char)print(f"The last occurrence of '{char}' is at index{last_index}.")exceptValueError:print(f"The character '{char}' does not exist in the string.") 1. 2. 3. 4. 5. 6. 7. 8. 如果字符存在,该代码会输出:The last occurrence of 'o' is a...
#L.pop([index]) -> item -- remove andreturnitem at index (defaultlast) lx= ['today','is','a','good','day'] lx.pop(2) print(lx) 结果:['today','is','good','day'] 8、remove:删除列表中指定的元素 #L.remove(value) -> None --remove first occurrence of value lx= ['today'...
Note:Theindex()method only returns the first occurrence of the matching element. Example 1: Find the index of the element # vowels listvowels = ['a','e','i','o','i','u']# index of 'e' in vowels index = vowels.index('e') ...
Write a Python program to find the index position of the last occurrence of a given number in a sorted list using Binary Search (bisect).Sample Solution: Python Code:from bisect import bisect_right def BinarySearch(a, x): i = bisect_right(a, x) if i != len(a)+1 and a[i-1] =...
l1 = l.index(‘kkkkk‘) print(type(l1),l1) 1. 2. 3. 输出结果: Traceback (most recent call last): File"C:/Users/William/PycharmProjects/Knight/练习区/day3/练习1.py", line 2, in l1= l.index(‘kkkkk‘) ValueError:‘kkkkk‘ is not in list ...
列表list (https://jq.qq.com/?_wv=1027&k=fpqlgUog) 初始化列表 指定元素初始化列表 >>> num=['aa','bb','cc',1,2,3] >>> print num ['aa', 'bb', 'cc', 1, 2, 3] 从字符串初始化列表 >>> a='oiawoidhoawd97192048f' ...
| L.remove(value) -- remove first occurrence of value. | Raises ValueError if the value is not present. | | 32.reverse(...)将列表反向排序 | L.reverse() -- reverse *IN PLACE* | | 33.sort(...)排序:从低到高(列表中的元素属于同一类型???) ...
2. Using theindex()Method (For Finding the First Occurrence) Theindex()method is used to find the index of the first occurrence of a specified element in a list. This method is particularly useful when you need to know the position of a specific element within a list. ...