我將它們用在需要封裝特殊的、非重用代碼上,避免令我的代碼充斥著大量單行函數。 列表推導式(list comprehension) 看一段簡單代碼 復制代碼代碼如下: testList = [1,2,3,4] def mul2(x): print x*2 [mul2(i) for i in testList] [mul2(i) for i in testList if i%2==0] 多維數組初始化 mult...
iterable的一個特點是所有的item會存儲到內存中,這樣會產生一些不便和不利的地方,于是催生了generator(后面講到)。 list comprehension(列表推導式) 復制代碼代碼如下: mylist = [x*x for x in range(3)] 表達式右邊是一個for循環(huán)的簡寫形式,用[]包裹起來(稱為list comprehension),表達式的值是一個list,我們可...
List comprehensions provide a concise way to create lists without resorting to use ofmap(),filter()and/orlambda. The resulting list definition tends often to be clearer than lists built using those constructs. Each list comprehension consists of an expression followed by aforclause, then zero or...
# using list comprehension + enumerate() # to remove duplicated from list res=[iforn, iinenumerate(test_list)ifinotintest_list[:n]] # printing list after removal print("The list after removing duplicates : "+str(res)) 方法5:使用 collections.OrderedDict.fromkeys() ...