#383 Python all() & any() & string.count() & string.ascii_lowercase

[LiuL0703]

all()
Return True if all elements of the iterable are true (or if the iterable is empty).
如果iterable的所有元素为真 , 则all(iterable)返回True，否则返回False；函数等价于:

def all(iterable):
    for element in iterable:
        if not element:
            return False
    return True

例如：

all(['a', 'b', 'c', 'd'])  # True
all([‘a’,'b','','d'])      #False

any() 则与all()相对
Return True if any element of the iterable is true. If the iterable is empty, return False.
如果iterable的任一元素为true 则返回true

def any(iterable):
    for element in iterable:
        if element:
            return True
    return False

any(['a', 'b', 'c', 'd'])  # True
any(['a','',''])      #True

[LiuL0703]

string.count()
语法：

str.count(sub, start= 0,end=len(string))

• sub -- 搜索的子字符串
• start 搜索起始位置默认为第一个字符串 即索引为0
• end 搜索结束位置 默认为最后一个字符串位置
  例子：

#!/usr/bin/python

str = "this is string example....wow!!!";

sub = "i";
print "str.count(sub, 4, 40) : ", str.count(sub, 4, 40)  
sub = "wow";
print "str.count(sub) : ", str.count(sub)    

str.count(sub, 4, 40) :  1
str.count(sub, 4, 40) :  2

array.count(x)
返回数组中x 出现的次数

[LiuL0703]

string.ascii_lowercase 为'abcdefjhijklmmnopqrstuvwxyz'

[LiuL0703]

#383 的 一种解法

class Solution(object):
 def canConstruct(self, ransomNote, magazine):
        """
        :type ransomNote: str
        :type magazine: str
        :rtype: bool
        """
        return all(ransomNote.count(i)<=magazine.count(i) for i in string.ascii_lowercase)