CODEWITHSUNDEEP
python
PryroTech
PryroTech

Reputation: 504

TypeError: unsupported operand type(s) for &: 'NoneType' and 'str'

I have been having some problems creating a character printer for an assignment in school, and I do not know how to solve it despite looking everywhere on StackOverflow. I am trying to enable the user to enter the symbols they want for the first two top and bottom lines, and have their two texts centered with forward and backslashes based on word length. However, this has been proven to be a problem.

I have tried to change variables as well as create variables that encapsulate the length of the text into an integer, this has proven to be unsuccessful. 

Repeats = input("How many times should the symbol repeat (1-30 CHARACTERS)?:")
insertText = input("Please enter text:")
insertText = str(insertText)
insertMoreText =input("Please enter text (again):")
insertMoreText= str(insertMoreText)
Repeats = int(Repeats)

#Determining text lengths/stored variables:
text1length = len(insertText)
text2length = len(insertMoreText)
forwardSlash = str("/")
backSlash = str("\\")
symbolsbeforeText = "*"
if(Repeats <= 30):
    print(firstSymbol * Repeats)
    print(secondSymbol * Repeats)
    print(symbolsbeforeText * Repeats)
    print (forwardSlash * text1length) & (insertText.upper()) & (forwardSlash 
    * text1length)
    print (backSlash * text2length) + (insertMoreText.lower()) + (backSlash * 
    text2length)
    print(symbolsbeforeText * Repeats)
    print(secondSymbol * Repeats)
    print(firstSymbol * Repeats)    
else:
    print("You have reached the repetition threshold, please try again.")

The error:

Traceback (most recent call last):
 File "C:\Users\colby\trainingTime.py", line 28, in <module>
 print (forwardSlash * text1length) & (insertText.upper()) & 
 (forwardSlash * text1length)
 TypeError: unsupported operand type(s) for &: 'NoneType' and 'str'

Process terminated with an exit code of 1

Upvotes: 1

Views: 1038

Answers (2)

lmiguelvargasf
lmiguelvargasf

Reputation: 69903

Your problem is that in Python 3+, print is a function that returns None, so:

print(forwardSlash * text1length)

returns None, and 

insertText.upper()

returns a str. Therefore, you cannot perform a bit-wise & operation on None and str.

A very good way to solve this is using an f-string which is a Python feature available since Python 3.6:

print(f"{backSlash * text2length} {insertMoreText.lower()} {backSlash * text2length}")

This will make your code more readable. See that you don't need to concatenate strings using + which probably lead to your confusion.

Upvotes: 1

blhsing
blhsing

Reputation: 106901

The print function always returns None, and you're performing bitwise-and operation with the returning value of print and (insertText.upper()), which is a string, which causes the said error.

You should call print with the entire expression enclosed in parentheses as an argument instead:

print((forwardSlash * text1length) & (insertText.upper()) & (forwardSlash * text1length))
print((backSlash * text2length) + (insertMoreText.lower()) + (backSlash * text2length))

Upvotes: 2

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