编程题求助

一行

这是CodeFights上面的一道编程题。

Implement a function that, given an integer n, will return the number of bits in its binary representation.

Example

For n = 50, the output should be
countBits(n) = 6.

5010 = 1100102, a number that consists of 6 digits. Thus, the output should be 6.

Input/Output

• [time limit] 4000ms (py3)
  

• [input] integer n
  A positive integer.
  Constraints:
  1 ≤ n ≤ 109.
• [output] integer
  The number of bits in binary representation of n.
  
  

给出的代码：

def countBits(n):

    return n. ...()

只能修改...的内容，请问这道题要怎么做。

冬雪雪冬

1. >>> def countBits(n):
   
2.         return n.bit_length()
   
3. >>> countBits(50)
   
4. 6

复制代码

海边浪花

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