print(union_index) # 输出: Index(['a', 'b', 'c', 'd', 'e'], dtype='object') index1 = pd.Index(['a', 'b', 'c', 'd']) index2 = pd.Index(['c', 'd', 'e', 'f']) sym_diff_index = index1.symmetric_difference(index2) print(sym_diff_index) # 输出: Index(['a...
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....
theenumerate()function returns a sequence ofcourses, where each list contains an index and a value fromcourseslist. Theforloops through over each list and unpacks the index and value into the variable’s index and value.
When Python processes a list, it expects any index used for accessing elements to fall within the established range: from 0 to one less than the length of the list for positive indices, and from -1 to negative the length of the list for negative indices. Accessing beyond these limits means...
<list>.index(<obj>)返回从左开始匹配到的第⼀个<obj>的索引<list>.count(<obj>)返回<obj>的个数 5)排序 <list>.sort(key=<排序规则>,reverse=<boolen>)#对列表的一种操作sorted(<可迭代对象>,key=<排序规则>,reverse=<boolen>)#返回一个新的排序过...
make an acronym by taking the first letter of each word in a phrase. We can do that through an operation calledstring indexing.This operation lets us access the character in a given position or index using square brackets and the number of the position we want, as the example below shows...
# this first kind of for-loop goes through a list for number in the_count: print "This is count %d" % number # same as above for fruit in fruits: print "A fruit of type: %s" % fruit # also we can go through mixed lists too ...
index += 1 Output: New York Los Angeles Chicago Houston Here is the output in the screenshot below: ReadMerge Lists Without Duplicates in Python Method 3: List Comprehension List comprehension is a concise way to create lists and iterate through them. It is often used for creating new lists...
IndexError: ‘list index out of range’ is a Python error that occurs when attempting to access a list item outside the range of the list. In Python, list indexes are used to access or perform actions on list items. For example, you can print them or iterate through them using loops....
<list>.index(<obj>)返回从左开始匹配到的第⼀个<obj>的索引 <list>.count(<obj>)返回<obj>的个数 5)排序 <list>.sort(key=<排序规则>,reverse=<boolen>)#对列表的一种操作 sorted(<可迭代对象>,key=<排序规则>,reverse=<boolen>)#返回一个新的排序过的列表 <list>.reverse()反转 6)复制 list...