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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def find_cuda():
    '''Locate the CUDA environment on the system.'''
    # search the PATH for NVCC
    for fldr in os.environ['PATH'].split(os.pathsep):
        cuda_path = join(fldr, 'nvcc')
        if os.path.exists(cuda_path):
            cuda_path = os.path.dirname(os.path.dirname(cuda_path))
            break
        cuda_path = None
    
    if cuda_path is None:
        print 'w> nvcc compiler could not be found from the PATH!'
        return None

    # serach for the CUDA library path
    lcuda_path = os.path.join(cuda_path, 'lib64')
    if 'LD_LIBRARY_PATH' in os.environ.keys():
        if lcuda_path in os.environ['LD_LIBRARY_PATH'].split(os.pathsep):
            print 'i> found CUDA lib64 in LD_LIBRARY_PATH:   ', lcuda_path
    elif os.path.isdir(lcuda_path):
        print 'i> found CUDA lib64 in :   ', lcuda_path
    else:
        print 'w> folder for CUDA library (64-bit) could not be found!'


    return cuda_path, lcuda_path