how to add input to a txt python code example

Example: how to write user input to a file in python

#Print User Input to A File
x = input("Enter blah : ")
y = open('C:\Users\USERNAME\Documents\Doc1.txt', 'w')
y.write(x)

#Convert text to binary and then write to file
x = input("Enter blah : ")
y = open('C:\Users\USERNAME\Documents\Doc1.txt', 'wb')
y.write(x)