How to Fix SyntaxError: (Unicode Error) 'Unicodeescape' Codec Can't Decode Bytes

Last Updated : 1 Jul, 2026

Unicodeescape error usually occurs when Python encounters an invalid escape sequence inside a string. This is most commonly seen when working with Windows file paths because backslashes (\) are interpreted as escape characters. If Python finds an incomplete or invalid Unicode escape sequence, it raises a SyntaxError.

Python 
file_path = "C:\Users\User\Documents\data.txt"

Output

ERROR!
Traceback (most recent call last):
File "<main.py>", line 1
file_path = "C:\Users\User\Documents\data.txt"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

Explanation: Python interprets \U as the beginning of a Unicode escape sequence. Since the sequence is incomplete, Python raises a Unicodeescape error.

Common Causes of Unicodeescape Error

1. Using Windows File Paths with Backslashes: Backslashes in Windows paths can accidentally form escape sequences such as \n, \t, or \U.

Python 
file_path = "C:\Users\User\Documents\data.txt"

Output

ERROR!
Traceback (most recent call last):
File "<main.py>", line 1
file_path = "C:\Users\User\Documents\data.txt"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

Explanation: \U in the path is treated as a Unicode escape sequence instead of a normal backslash.

2. Incomplete Unicode Escape Sequence: Python expects \U to be followed by exactly 8 hexadecimal digits. If the sequence is incomplete, an error occurs.

Python 
file_path = "C:\Users\User\Documents\data\U1234.txt"

Output

ERROR!
Traceback (most recent call last):
File "<main.py>", line 1
file_path = "C:\Users\User\Documents\data\U1234.txt"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

Explanation: sequence \U1234 is not a valid Unicode escape because it does not contain the required 8 hexadecimal digits.

Handling Unicodeescape Error

1. Raw Strings: A raw string treats backslashes as normal characters and prevents Python from interpreting them as escape sequences.

Python 
file_path = r"C:\Users\User\Documents\data.txt"
print(file_path)

Output
C:\Users\User\Documents\data.txt

Explanation: r prefix tells Python to treat the entire string literally, so the backslashes are preserved as regular characters.

2. Double Backslashes: Escape backslashes by doubling them (\), explicitly indicating that they should be treated as literal characters.

Python 
file_path = "C:\\Users\\User\\Documents\\data.txt"
print(file_path)

Output
C:\Users\User\Documents\data.txt

Explanation: Each double backslash represents a single literal backslash in the final string.

3. Forward Slashes: Python also accepts forward slashes / in file paths on Windows, avoiding escape issues entirely.

Python 
file_path = "C:/Users/User/Documents/data.txt"
print(file_path)

Output
C:/Users/User/Documents/data.txt

Explanation: Since forward slashes are not treated as escape characters, no Unicodeescape error occurs.

4. Valid Unicode Escape Sequences: If you intentionally use Unicode escapes, ensure that the sequence is complete and valid.

Python 
text = "\U0001F600"
print(text)

Output
😀

Explanation: Unicode escape sequence contains exactly 8 hexadecimal digits, so Python interprets it correctly.

5. pathlib for File Paths: pathlib module provides a cleaner and safer way to work with file paths.

Python 
from pathlib import Path
file_path = Path("C:/Users/User/Documents/data.txt")
print(file_path)

Output
C:/Users/User/Documents/data.txt

Explanation: pathlib automatically handles path formatting and reduces the chances of path-related errors.

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