Backslash is not used in f-string it results in error SyntaxError: F-string Expression Part Cannot Include A Backslash in Python. Please read the following article to get ideas for how to fix the error.
f-string
f-string is the latest syntax for string formatting in Python. f-string is supported since version 3.6.
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.
In simple terms, we format a string in Python by writing the letter f or F in front of the string and then assigning a replacement value to the replacement field. We then transform the replacement value we just assigned to match the format in the replace field and complete the process.
What causes the error “SyntaxError: F-string expression part cannot include a backslash”?
The error happens because the backslash is not used between the curly braces of the formatted string.
Example:
firstStr = 'visit learnshareit website'
secondStr = ' !!! '
newStr = f"{firstStr\nsecondStr}"
print(newStr)Output:
File "<ipython-input-1-5a0153b29306>", line 3
newStr = f'{firstStr\nsecondStr}'
^
SyntaxError: f-string expression part cannot include a backslashHow to solve this error?
Use format() method
A simple way to solve the error is using the format() method instead of backslash.
Syntax:
format(value[, format_spec])
Parameters:
- value: value to be formatted.
- format_spec: format you want to use for ‘value’.
The format() method returns the formatted result of a given value specified by the specified formatting.
Example:
- I create two strings.
- Use the format() function to format two strings through pattern: {:3s}, which has the effect of formatting the string. And using a backslash in this method should not cause any errors.
firstStr = 'visit learnshareit website'
secondStr = ' !!! '
# Use the format() function to format two strings through pattern: {:3s}
print('{:3s} \n {:3s}'.format(firstStr, secondStr))Output:
visit learnshareit website
!!!Put a backslash outside { }
If you still want to use a backslash in the f-string format, then your solution is to put the backslash outside the {} so the error will be resolved.
Example:
- I create two strings.
- Use formatting and be careful to put backslash outside the {}.
firstStr = 'visit learnshareit website'
secondStr = ' !!! '
# Put backslash outside the {}
newStr = f'\n{firstStr}\n{secondStr}'
print(newStr)Output:
visit learnshareit website
!!!Summary
If you have any questions about the error “SyntaxError: f-string expression part cannot include a backslash” in Python, please leave a comment below. I will answer your questions. Thanks for reading!
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My name is Jason Wilson, you can call me Jason. My major is information technology, and I am proficient in C++, Python, and Java. I hope my writings are useful to you while you study programming languages.
Name of the university: HHAU
Major: IT
Programming Languages: C++, Python, Java
