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newlist.append(x) print(newlist) Try it Yourself » With list comprehension you can do all that with only one line of code: Example fruits = ["apple","banana","cherry","kiwi","mango"] newlist = [xforxinfruitsif"a"inx]
(一)使用List Comprehension的好处 在了解Python的List Comprehension之前,我们习惯使用for循环创建列表,比如下面的例子: numbers = range(10) my_list=[]fornumberinnumbers: my_list.append(number*number)print(my_list) 可是在Python中,我们有更简洁,可读性更好的方式创建列表,就是List Comprehension: my_list =...
List comprehension offers a concise way to create a new list based on the values of an iterable. In this article, we will learn about Python list comprehensions with the help of examples.
如果想了解list comprehension原理的东西,这个人文章写得很清楚:http://blog.chinaunix.net/uid-28631822-id-3488324.html 5.实践: 在来一道题,摘自《Python基础教程》: >>> girls = ['alice','bernice','clarice']>>> boys = ['chris','arnold','bob']>>> [b+'+'+gforbinboysforgingirlsifb[0]=...
list comprehension(列表推导式) 在python中,list comprehension(或译为列表推导式)可以很容易的从一个列表生成另外一个列表,从而完成诸如map, filter等的动作,比如: 要把一个字符串数组中的每个字符串都变成大写: names = ["john", "jack", "sean"] ...
Python List Comprehension List comprehension in Python provides a concise way to create lists. It allows generating a new list by applying an expression to each element in an iterable, such as a list, tuple, or range, in a single line of code. This method improves readability and performance...
Python list comprehension Alist comprehensionis a syntactic construct which creates a list based on existing list. List comprehensions provide a concise way to create lists. It is a common requirement to make new lists where each element is the result of some operations applied to each member of...
Python的列表推导式(list comprehension)是一种简洁的构建列表(list)的方法,它可以从一个现有的列表中根据某种指定的规则快速创建一个新列表。这种方法不仅代码更加简洁,执行效率也很高。 列表推导式通常包括以下几个部分: 输出表达式:新列表中的元素,可以是简单的元素,也可以是应用了某种操作的结果。 迭代变量:在原始...
A list comprehension consists of brackets containing an expression followed by a for clause, then zero or more for or if clauses. The result will be a new list resulting from evaluating the expression in the context of the for and if clauses which follow it. ...