判断一个整数是否是回文数。不可以用额外的空间 我的思路很简单。就是计算首和尾,检测是否相同 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 classSolution(object): defisPalindrome(self, x): ifx<0:returnFalse i,a=0,x whilea!=0: a=a/10 i+=1 first_i=10**(i-1)...
写python的可能很容易想到把数字12345转换成序列类型然后反转判断反转前后是否相同来判断回文数,但是这样明显多出来了2个字符串对象,字符串和数字可不一样,字符串的基本单位是字符,字符才是和数字一个级别的,通俗讲数字12和1234占用空间一样,字符串12和1234差了约一半。也就是说我们可以操作数字本身,但是不能“投机...
Basically, this method returns a lowercased version of the string. We reverse the string using the built-in function reversed(). Since this function returns a reversed object, we use the list() function to convert them into a list before comparing....
Write a Python function to check whether a number is "Perfect" or not.According to Wikipedia : In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also k...
Click me to see the sample solution 12. Check if a String is a Palindrome Write a Python function that checks whether a passed string is a palindrome or not. Note: A palindrome is a word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run. ...
\# using the title() function of string class new\_string = my\_string.title() print(new\_string) \# Output \# My Name Is Chaitanya Baweja 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 3. 查找字符串的唯一要素 ...
Imagine you’ve written a function to tell if a string is apalindrome. An initial set of tests could look like this: Python deftest_is_palindrome_empty_string():assertis_palindrome("")deftest_is_palindrome_single_character():assertis_palindrome("a")deftest_is_palindrome_mixed_casing():asse...
# using the title() function of string class new_string = my_string.title() print(new_string) # Output # My Name Is Chaitanya Baweja 3. 查找字符串的唯一要素 以下代码可用于查找字符串中所有的唯一要素。我们使用其属性,其中一套字符串中的所有要素都是唯一的。
所谓回文数 Palindrome Number,即从左边开始读或从右边开始读,两者结果一致。判断的目标数字为整数,包括负数。 比如12321,123321,或者 3,都是回文数。 -12321不是回文数;-1也不是回文数。 解法1. 简单解法:将整数转换为字符串 转换之后,Python有转换的 reverse 函数,将字符串进行反转:str[::-1]。
def cycle(f1, f2, f3): """Returns a function that is itself a higher-order function. >>> def add1(x): ... return x + 1 >>> def times2(x): ... return x * 2 >>> def add3(x): ... return x + 3 >>> my_cycle = cycle(add1, times2, add3) >>> identity = my...