用Python实现二分查找

用Python实现二分查找

#!/usr/bin/env python
import sys 
def search2(a,m):
    low = 0 
    high = len(a) - 1 
    while(low <= high):
        mid = (low + high)/2
        midval = a[mid]
    
        if midval < m: low = mid + 1 elif midval > m:
            high = mid - 1 
        else:
            print mid 
            return mid 
    print -1
    return -1
if __name__ == "__main__":
    a = [int(i) for i in list(sys.argv[1])]
    m = int(sys.argv[2])
    search2(a,m)