returnlist(flatten(a)) #使用库iteration_utilities defiteration_utilities_deepflatten(a): returnlist(deepflatten(a, depth=1)) 2.测试 a=[[1,2,3],[4,5,6],[7,8,9]] print(a) print('--------------------------') print(forfo
def flatten(alist): """二维列表扁平化 """ result=[] # *** Begin ***# for i in range(2): for j in range(len(alist[i])): result.append(alist[i][j]) # *** End ***# return result #创建一个二维列表 M=eval(input()) # eval将输入数据转回原来类型 N=eval(input()) matri...
Thereduce() functionfrom thefunctoolsmodule can also be used to flatten a list of lists. Thereduce()function applies a function of two arguments cumulatively to the items of a sequence, from left to right, so as to reduce the sequence to a single value. ...
flat = lambda L: sum(map(flat, L), []) if isinstance(L, list) else [L] print(flat(list1)) 1. 2. 3. 4. 方法3: a = [1, 2, [3, 4], [[5, 6], [7, 8]]] flatten = lambda x: [y for l in x for y in flatten(l)] if type(x) is list else [x] print(flatten...
There are multiple approaches to achieve this, and we’ll explore them in detail to provide a comprehensive understanding. Shallow Flattening Using the DoubleforLoop Method A straightforward way to flatten a list is by using a doubleforloop. This method utilizes two nestedforloops to iterate throu...
FlattenList: [3,4,5,7,8,9,10] Explanation Here, a two-dimensional list consisting ofelements [[3, 4, 5],[ 7, 8, 9, 10]]are assigned to a variable called nested_lists. A variable called flatten_list is initialized with emptybrackets []. Then a for loop is used for iterating ...
a=[1,2,[3,4],[[5,6],[7,8]]]flatten=lambda x:[yforlinxforyinflatten(l)]iftype(x)is listelse[x]print(flatten(a)) 2. 列表去重 列表去重可能会破坏原有的顺序,所以下面分别介绍保留顺序和不保留顺序的做法。 去重,但改变顺序 去重但改变顺序,两种方法 ...
x = flatten(nested) print(x) 当你运行此代码时,应该最终得到一个只有整数的List列表,而不是整数列表加一个列表。 当然,还有许多其他有效的方法来展开嵌套列表,例如使用Python的itertools.chain()。 小结 现在,我想你应该基本了解递归的工作原理以及如何在Python中使用了。
In this tutorial, you'll learn how to flatten a list of lists in Python. You'll use different tools and techniques to accomplish this task. First, you'll use a loop along with the .extend() method of list. Then you'll explore other tools, including reduce(), sum(), itertools.chain...
[记录点滴] 一个Python中实现flatten的方法 之前如果想使用flatten,一般借助于numpy.ndarray.flatten。 但是flatten只能适用于numpy对象,即array或者mat,普通的list列表不适用。 最近找到一个轻便的办法如下: fromitertoolsimportchain# flattenprint(list(set(chain.from_iterable(["aaa","bbb", ["c","d","e"]]...