TypeError: integer argument expected, got float IN LIST PYTHON

Question

For some reason the line "new1 = [chr(x) for x in new]" cannot take a float. I am converting all the ASCII integers in the 'new' list back to a list with characters, according to their respective ASCII number, this list would be saved as new1.

if de == "d":
   num = input("input ur number: ")
   key = int(input("Decryption key?"))
   num = [int(x) for x in num.split()]
   new = [x /key for x in num]
   new1 = [chr(x) for x in new]

This is the error:

--Traceback (most recent call last): File "C:\Python34\Encryptiontrue.py", line 23, in new1 = [chr(x) for x in new]

-- File "C:\Python34\Encryptiontrue.py", line 23, in new1 = [chr(x) for x in new]

-- TypeError: integer argument expected, got float

Full Code:

de = input("Decrypt or encrypt?: ")

if de == "e":
   word = input("input ur text: ")
   word = word.lower() 
   new = list(word)

   key = int(input("what number by?: "))

   new1 = [ord(x) * user for x in new]

   new2 = " ".join(str(x) for x in new1)
   print(new2)

if de == "d":
   num = input("input ur number: ")
   key = int(input("Decryption key?"))
   num = [int(x) for x in num.split()]
   new = [x /key for x in num]
   new1 = [chr(x) for x in new]

chr(x) shouldn't take a float because how would you convert something like 26.23 into a ascii character? do an explicit integer conversion in your list comprehension for new with x//key or int(x/key). — R Nar
– R Nar, Commented Dec 14, 2015 at 16:42

Steven Rumbalski · Accepted Answer · 2015-12-14 16:52:53Z

1

Change

new = [x / key for x in num]

To

new = [x // key for x in num]

In Python 3, / indicates "true division" which always returns a float. // indicates "floor division". Floor division will return an integer if both arguments are integers. For more details see PEP 238 -- Changing the Division Operator.

edited Dec 14, 2015 at 16:52

answered Dec 14, 2015 at 16:45

Steven Rumbalski

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6 Comments

mgilson Over a year ago

I find that a lot of people are confused about the // operator. You might want to explain why changing it to // fixes the problem.

Steven Rumbalski Over a year ago

Working on that. Thinking about just linking to the PEP.

mgilson Over a year ago

Actually, I'm not completely sure that will work as chr(10.//3.) is still a TypeError. (from the PEP: the result type will be the common type into which a and b are coerced before the operation)

Steven Rumbalski Over a year ago

@mgilson: Good point. But the OP's code is not using floats so it won't be an issue here.

mgilson Over a year ago

Ahh, right. I didn't look at OP's code closely enough to infer the types of x and key. Sorry for the noise.

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