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How to resolve TypeError: decoding str is not supported in Python - LearnShareIT

How to resolve TypeError: decoding str is not supported in Python

TypeError: decoding str is not supported in Python

TypeError: decoding str is not supported in Python is an error you may encounter when programming. The following article will show the cause and some ways to handle the error, such as setting parameters to the function correctly, using the addition operator to concatenate strings, the str.format(), and f-string functions. Post details below.

What causes the TypeError: decoding str is not supported in Python?

The “TypeError: decoding str is not supported” occurs when the second argument of the str() function is passed, the first argument must be a bytes object, or the same error also occurs when the second and third arguments are passed to the str() function.

Example: 

firstStr = 'learnshareit'

# Use the str() function
newStr = str(firstStr, encoding='utf-8')
print(newStr)

Output:

Traceback (most recent call last):
 File "./prog.py", line 4, in <module>
TypeError: decoding str is not supported

The error here is that when you pass the second argument to the encoding=’utf-8′ function, the first argument will have to be a bytes object.

The same error occurs when you put the 2nd and 3rd parameters as the str() function.

Example:

firstStr = 'learnshareit'

# Use the str() function
newStr = str(firstStr, str('website'))
print(newStr)

Output:

Traceback (most recent call last):
 File "./prog.py", line 4, in <module>
TypeError: decoding str is not supported

How to solve the TypeError: decoding str is not supported in Python?

The first parameter must be a bytes object if the second argument is passed

As above, the example causes an error if the second parameter encoding=’utf-8′ is passed to the str() function. The first argument must be a bytes object.

Example:

# Create a bytes object
bytesObject = b'learnshareit'

# Use the str() function to return a string
newStr = str(bytesObject, encoding='utf-8')

print('The bytes object converts to a string:', newStr)

Output:

The bytes object converts to a string: learnshareit

Use the addition operator to concatenate strings

You can use the addition operator to join strings together.

Example:

# Create a bytes object
bytesObject = b'learnshareit'

# Use the str() function to return a string
firstStr = str(bytesObject, encoding='utf-8')

# Use the addition operator to concatenate two strings
secondStr = ' website'
print('Result after concatenating two strings:', firstStr+secondStr)

Output:

Result after concatenating two strings: learnshareit website

Use the str.format() function

Syntax:

str.format(value1, value2, ….)

Parameter:

  • value: value to be formatted.

The format() method returns the formatted result of a given value specified by the specified formatting.

Example:

  • Use the str.format() to concatenate two strings.
  • Alternate fields {} receive values ​​from the format() function argument, then format them in the specified format and return the result to a string.
strToInsert = ' website'

# Use the str.format() function to concatenate two strings
result = ('learnshareit{}'.format(strToInsert))
print('Result after concatenating two strings:', result)

Output:

Result after concatenating two strings: learnshareit website

Use f-string

Syntax:

f'a{value:pattern}b'

Parameters:

  • f character: use the string f to format the string.
  • a,b: characters to format.
  • {value:pattern}: string elements need to be formatted.
  • pattern: string format.

Example:

firstStr = 'learnshareit'
strToInsert = ' website'

# Use the f-string to concatenate two strings
result = f'{firstStr}{strToInsert}'
print('Result after concatenating two strings:', result)

Output:

Result after concatenating two strings: learnshareit website

Summary

Hope the article gives you an idea to fix the TypeError: decoding str is not supported in Python. Please comment below if you have any questions, and we will try to answer them. Thanks for reading.

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