Cannot call function with argument of Nim from Python3

[toshikiohnogi]

I wrote simple code of Nim `nim.nim` below. 
    
    
    proc nimSample*(n: cint) {. exportc .} =
      echo n
    
    
    Run

also by Python3 
    
    
    import ctypes
    
    nim = ctypes.CDLL('nim')
    arg = ctypes.c_int(1)
    nim.nimSample(arg)
    
    
    Run

But there are not available. Error message below. 
    
    
    Segmentation fault: 11
    
    Run

Please let me know why this code is not available.

Thanks.