Setting Intermediate Frequency in Python

I am using this code to set an intermediate frequency in Python

usrp = uhd.usrp_source(device_addr = addr, io_type =
uhd.io_type.COMPLEX_FLOAT32, num_channels = 1)

usrp.set_rx_freq (0, 1.03e9)

but I am getting an error as:

AttributeError: ‘uhd_usrp_source_sptr’ object has no attribute

But i saw this in some USRP documents. Is this an old and out of use
code? How can I set the IF.

(My purpouse of using IF is cancelling the unreal center
peak.Re: [Discuss-gnuradio] nonexisted peaks USRP N210 Connection)


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