如何利用字符串参数中的变量进行函数调用

Question

I want to create text files each different in respect to the ending. For example

for x in range(2)
     np.savetxt('filex', a1, delimiter=',')

Through this I should have 3 files: file0, file1, file2

UPDATE

This works but this only generated one file.

for x in range(2)
     np.savetxt('file'+str(x), a1, delimiter=',')

Answer 1

you could use string formatting

for x in range(2)
     np.savetxt('file%s' % x, a1, delimiter=',')

Answer 2

for x in range(2)
     np.savetxt('file' + str(x), a1, delimiter=',')

should work