python列表比较好
Ⅰ python 元组与列表哪个更合适
任何时候优先使用元组总没有坏处，只有需要动态修改时才使用列表。这样可以避免一些初学看来“奇怪”的问题，例如参数的默认值会变化的问题。
Ⅱ Python列表最多可以放多少数据
一般应用场景都不用考虑这个大小，因为这个上限很高，
需要用到这么多元素的list的时候，都需要考虑很多其它问题。
1----------32位python的限制是 536870912 个元素。
2----------64位python的限制是 1152921504606846975 个元素。
Ⅲ 关于python列表
等于4就对了
因为数组之的赋值,是地址引用
你执行b = a 就以经把A数组的索引地址也一同赋于b,并非从内存空间重新开辟一个空间给b
所以你执行b[1]=4; 就是直接指向了数组的存储地址改变了它的值
你把b=a 改成 b=a[:] 看看 浅拷贝
Ⅳ python list 比较大小问题
我觉得应该是 a.sort(cmp=lambda x,y: cmp(x[3],y[3])) 是in place 排序
下面是联机文档的内容：
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 多个元素的列表，如何进行比较呢
从第一个元素顺序开始比较，如果相等，则继续
返回第一个不相等元素比较的结果
如果所有元素比较均相等，则长的列表大，一样长则两列表相等
Ⅵ python怎么比较两个列表中的元素
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如何有效的比较一个变化的列表
转set,然后用union(联合), intersection(交), difference(差)和sysmmetric difference(对称差集)等数学运算比较
Ⅷ python两个列表比较
直接遍历即刻
for i in a:
if i in b:
c.append (i)
Ⅸ python中List，Queue等数据结构存储效率哪个更优
综合来说queue更好
这是对list操作的时间复杂度 Average是平均情况，worst case是最坏情况。
这是deque的
Ⅹ python两个列表怎么比较找出不同
可以使用把列表转换成集合然后做它们的差集，比如我们可以从下面的例子中得出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)
输出：
[2, 4]