python列表比較好
Ⅰ python 元組與列表哪個更合適
任何時候優先使用元組總沒有壞處，只有需要動態修改時才使用列表。這樣可以避免一些初學看來「奇怪」的問題，例如參數的默認值會變化的問題。
Ⅱ Python列表最多可以放多少數據
一般應用場景都不用考慮這個大小，因為這個上限很高，
需要用到這么多元素的list的時候，都需要考慮很多其它問題。
1----------32位python的限制是 536870912 個元素。
2----------64位python的限制是 1152921504606846975 個元素。
Ⅲ 關於python列表
等於4就對了
因為數組之的賦值,是地址引用
你執行b = a 就以經把A數組的索引地址也一同賦於b,並非從內存空間重新開辟一個空間給b
所以你執行b[1]=4; 就是直接指向了數組的存儲地址改變了它的值
你把b=a 改成 b=a[:] 看看 淺拷貝
Ⅳ python list 比較大小問題
我覺得應該是 a.sort(cmp=lambda x,y: cmp(x[3],y[3])) 是in place 排序
下面是聯機文檔的內容：
The sort() and reverse() methods modify the list in place for economy of
space when sorting or reversing a large list. To remind you that they operate by
side effect, they don』t return the sorted or reversed list.
The sort() method takes optional arguments for controlling the
comparisons.cmp specifies a custom comparison function of two arguments (list
items) which should return a negative, zero or positive number depending on
whether the first argument is considered smaller than, equal to, or larger than
the second argument: cmp=lambdax,y:cmp(x.lower(),y.lower()). The
default value is None.key specifies a function of one argument that is used to extract a
comparison key from each list element: key=str.lower. The default value is None.reverse is a boolean value. If set to True, then the list
elements are sorted as if each comparison were reversed.In general, the key and reverse conversion processes are
much faster than specifying an equivalent cmp function. This is because
cmp is called multiple times for each list element while key
and reverse touch each element only once. Use functools.cmp_to_key() to convert an old-style
cmp function to a key function.Changed in version 2.3:
Support for None as an equivalent to omitting cmp was
added.Changed in version 2.4:
Support for key and reverse was added.
Starting with Python 2.3, the sort() method is
guaranteed to be stable. A sort is stable if it guarantees not to change the
relative order of elements that compare equal — this is helpful for sorting in
multiple passes (for example, sort by department, then by salary grade).
CPython implementation detail: While a list is being sorted,
the effect of attempting to mutate, or even inspect, the list is undefined. The
C implementation of Python 2.3 and newer makes the list appear empty for the
ration, and raises ValueError if it
can detect that the list has been mutated ring a sort.
Ⅳ Python list 多個元素的列表，如何進行比較呢
從第一個元素順序開始比較，如果相等，則繼續
返回第一個不相等元素比較的結果
如果所有元素比較均相等，則長的列表大，一樣長則兩列表相等
Ⅵ python怎麼比較兩個列表中的元素
l1 = list('11100101')
l2 = list('00101011')
l3 = ['1' if l1[i]==l2[i] else '0' for i in range(len(l1))]
print ''.join(l3)
Ⅶ python如何有效的比較一個變化的列表
轉set,然後用union(聯合), intersection(交), difference(差)和sysmmetric difference(對稱差集)等數學運算比較
Ⅷ python兩個列表比較
直接遍歷即刻
for i in a:
if i in b:
c.append (i)
Ⅸ python中List，Queue等數據結構存儲效率哪個更優
綜合來說queue更好
這是對list操作的時間復雜度 Average是平均情況，worst case是最壞情況。
這是deque的
Ⅹ python兩個列表怎麼比較找出不同
可以使用把列表轉換成集合然後做它們的差集，比如我們可以從下面的例子中得出l1和l2列表不同的元素：
l1 = [1,2,3,4,5]
l2 = [1,3,5]
difference = list(set(l1) - set(l2))
print(difference)
輸出：
[2, 4]