python的numpy中合并array答:In [1]: a = array([1,2,3])In [2]: b = array([4,5,6])In [3]: numpy.vstack((a,b))Out[3]:array([[1, 2, 3],[4, 5, 6]])
python2怎么把数组的内容连接到一起答:通过for循环拼接数组的元素:a=[1,2,3,4,5,6,7,8,9]b=""for i in a: b=b+str(i)print b输出:123456789方案2:通过for循环不换行逐个输出元素:(数字间有空格)a=[1,2,3,4,5,6,7,8,9]for i in a: print i,#注意这里有一个逗号哦输出:1 2 3 4 5 6 7 8 9 ...
python里,怎么合并相同的数组的值?答:x=[['北京', 2], ['北京', 1], ['天津', 1], ['福建', 1]]tmp = {} for v in x:tmp[v[0]] = tmp.get(v[0]) and tmp[v[0]] + v[1] or v[1]x= [ [k, v] for (k, v) in tmp.items() ]print(x)输出:[['北京', 3], ['福建', 1], ['天津', ...