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The procedure for carrying out a cold reset on a smart card reader using python may vary depending on the specific reader and its interface. However, generally, the following steps can be followed:

1. Establish a connection with the card reader using a suitable library or API in python such as PySCard, smartcard, or pyscard.

2. Send the reset command to the card reader using the library's functions or methods. The reset command for a cold reset may vary depending on the reader and its interface, but usually, it is a combination of control byte and reset code.

3. Wait for the card reader to complete the reset process and return a response indicating that the reset is complete.

4. Close the connection with the card reader.

Here is an example code snippet using PySCard library that performs a cold reset on a smart card reader:

import smartcard.scard as scard
import smartcard.util as util

#Establish a connection with the card reader
hcontext = scard.EstablishContext(scard.SCARD_SCOPE_USER)
readerlist = scard.ListReaders(hcontext)
readername = readerlist[0]
hcard = scard.Connect(hcontext, readername)

#Send the reset command to the card reader
cold_reset_command = [0x00, 0x00, 0x00, 0x80, 0x0A]
response, sw1, sw2 = hcard.transmit(cold_reset_command)

#Wait for the reset to complete
if sw1 == 0x90 and sw2 == 0x00:
    print("Cold reset successful")
else:
    print("Error in cold reset")

#Close the connection with the card reader
hcard.disconnect()
scard.ReleaseContext(hcontext)

Note: This example is for demonstration purposes only and may need to be tailored according to the specific reader and card interface.