Trouble defining a function using the "codecs" module

Question

I am trying to write a simple Rot13 Encoder/Decoder that takes a string and encodes/decodes it using the "codecs" module. I am trying to define a function using: codecs.encode('rot13_text', 'rot_13')

I have no problem using using the codecs module outside of a function. When I attempt to define a function using codecs.encode(rot13_text, 'rot_13') I receive a NameError

So far I have attempted many variations of the following code:

import codecs

def rot13_encoder():
    rot13_text = input("Type the text to be encoded: ")
    codecs.encode(rot13_text, 'rot_13')
    print(rot13_text)

Terminal Output

>>> def rot13_encoder():
...     rot13_text = input("Type the text to encode and press enter: ")
...     codecs.encode(rot13_text, 'rot_13')
...     print(rot13_text)
...
>>> rot13_encoder()
Type the text to encode and press enter: HELLO
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in rot13_encoder
  File "<string>", line 1, in <module>
NameError: name 'HELLO' is not defined
>>>

There's no built-in rot_13 encoder/decoder. How have you registered your codec to begin with? — AKX
– AKX, Commented Sep 9, 2019 at 8:22
@AKX: There is a built-in rot_13 codec, at least in some versions of python. (also, hi :) — Aleksi Torhamo
– Aleksi Torhamo, Commented Sep 9, 2019 at 8:24
OP has tagged their question with python-3.x so I assume that's what they're using. (Hi!) — AKX
– AKX, Commented Sep 9, 2019 at 8:25
Your code works for me w/o any errors. I'm using python 3.7.3. — Arienrhod
– Arienrhod, Commented Sep 9, 2019 at 8:28
@AKX: It's present in both python-2.x and python-3.x; I'm not sure when it was introduced to 2.x, but it was apparently missing from 3.x versions before 3.2. — Aleksi Torhamo
– Aleksi Torhamo, Commented Sep 9, 2019 at 8:29

user5386938 · Accepted Answer · 2019-09-09 08:24:15Z

1

It seems you are using python 2.7 or earlier.

import codecs

def rot13_encoder(in_string):
    return codecs.encode(in_string, 'rot_13')

in_string = raw_input('Type the text to be encoded: ')
print(rot13_encoder(in_string))

in which case you should use raw_input(...) instead of input(...)

answered Sep 9, 2019 at 8:24

user5386938

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1 Comment

R45PUT1N Over a year ago

I like the way you did this. Thank you very much for your correction. I appreciate your quick response. It's working just fine now! Thank you very much

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Trouble defining a function using the "codecs" module

I am trying to write a simple Rot13 Encoder/Decoder that takes a string and encodes/decodes it using the "codecs" module. I am trying to define a function using: codecs.encode('rot13_text', 'rot_13')

Terminal Output

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I am trying to write a simple Rot13 Encoder/Decoder that takes a string and encodes/decodes it using the "codecs" module. I am trying to define a function using: codecs.encode('rot13_text', 'rot_13')

Terminal Output

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