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Python 2 (47)

for i in range(2**n):print bin(2**n+i/2^i)[3:]

The expression i/2^i for the i'th gray code number is from the this answerthis answer. To add leading zeroes that pad to length n, I add 2**n before converting to a binary string, creating a string of length n+1. Then, I truncate the leading 1 and number type prefix 0b with [3:].

Python 2 (47)

for i in range(2**n):print bin(2**n+i/2^i)[3:]

The expression i/2^i for the i'th gray code number is from the this answer. To add leading zeroes that pad to length n, I add 2**n before converting to a binary string, creating a string of length n+1. Then, I truncate the leading 1 and number type prefix 0b with [3:].

Python 2 (47)

for i in range(2**n):print bin(2**n+i/2^i)[3:]

The expression i/2^i for the i'th gray code number is from the this answer. To add leading zeroes that pad to length n, I add 2**n before converting to a binary string, creating a string of length n+1. Then, I truncate the leading 1 and number type prefix 0b with [3:].

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xnor
xnor
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Python 2 (47)

for i in range(2**n):print bin(2**n+i/2^i)[3:]

The expression i/2^i for the i'th gray code number is from the this answer. To add leading zeroes that pad to length n, I add 2**n before converting to a binary string, creating a string of length n+1. Then, I truncate the leading 1 and number type prefix 0b with [3:].