Insert / edit overwriting code

Answered

I am editing code in the Pycharm editor, I can't insert/amend text without it overwriting 

 

for example, if I wanted to change the last two digits of this MAC address.in this line (subprocess.call("ifconfig wlan0 hw ether 11:22:33:44:55:66", shell =True) I would delete the 66 and replace it with say 44 but it overwrites, shell =True) 

I want to be able to insert/edit without this occurring 

 

 

 

 

 

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