给定一个字符串，可能包含空格、字母等转化为数字，或者逆序输出数字
下面是具体实现：
#!usr/bin/env python #encoding:utf-8 ''' __Author__:沂水寒城 功能：将字符串转化为数字 ''' def trans_str2_num(one_str): ''' ''' sigmod=1 one_str=one_str.strip() if not one_str: return 0 if one_str[0]=='-': sigmod=-1 one_str=one_str[1:] elif one_str[0]=='+': one_str=one_str[1:] else: pass one_str_list=list(one_str) for i in range(len(one_str_list)): if not one_str_list[i].isdigit(): one_str_list=one_str_list[:i] break res=0 #想逆序输出的话可以使用 # for one in one_str_list[::-1]: for one in one_str_list: res+=ord(one)-ord('0') res*=10 res/=10 res*=sigmod if res>2147483647: return 2147483647 elif res<-2147483647: return -2147483647 else: return res if __name__ == '__main__': one_str_list=['',' ','-123j442','2389083','hjsdhvj','21474836479','-21474836479'] for one_str in one_str_list: print one_str+'---->'+str(trans_str2_num(one_str))
结果如下：
---->0 ---->0 -123j442---->-123 2389083---->2389083 hjsdhvj---->0 21474836479---->2147483647 -21474836479---->-2147483647 [Finished in 0.7s]
