← index #17075Issue #8868
Off-topic · high · value 4.421
QUERY · ISSUE

Syntax Error when using multiline f-strings on RP2040 with MicroPython v1.23.0

openby kpg141260opened 2025-04-04updated 2025-10-03
bugproposed-close

Port, board and/or hardware

RP2040 Raspberry Pi Pico

MicroPython version

MicroPython Version: v1.23.0 (2024-06-02)
RP2040 Platform: Raspberry Pi Pico
Python Version: MicroPython (RP2040)
Firmware: v1.23.0
Hardware: Raspberry Pi Pico (RP2040)

Reproduction

msg = (
    f'One ' 
    f'Two ' 
    f'Three'
)

print(msg)

Expected behaviour

The above code should print the concatenated string One Two Three without any syntax errors, similar to how it works in standard Python environments.

Observed behaviour

SyntaxError: invalid syntax

Additional Information

This issue persists even when re-typing the code, leading me to suspect it might be an issue with the way multiline f-strings are handled on this particular platform.

The issue can be resolved by concatenating the f-strings manually using +:

msg = (
    f'One ' +
    f'Two ' +
    f'Three'
)

print(msg)

Workaround:

Using string concatenation (as shown above) works, but this is not as elegant and adds unnecessary complexity compared to expected behaviour.

What else I have tried:

Testing with other Python environments (such as standard Python 3.x) shows that the multiline f-string works as expected.

This issue does not occur with simpler, single-line f-strings.
Ensuring no invisible characters or incorrect syntax in the code.

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

Formatted string literals cannot handle colon character in string literals

openby weinandopened 2022-07-05updated 2022-07-06
bugpy-core

I'm using MicroPython v1.19.1-88-g74e33e714 on 2022-06-30; Raspberry Pi Pico W with RP2040

Running the following expression in the REPL:

print(f"foo {':'} bar")

results in this error:
<img width="322" alt="CleanShot 2022-07-05 at 22 55 26@2x" src="https://user-images.githubusercontent.com/1898161/177414906-b19ca3e6-232b-45d3-9873-bdde8f86121f.png">

Replacing the ':' by any other character fixes the "syntax error":
<img width="270" alt="CleanShot 2022-07-05 at 23 06 54@2x" src="https://user-images.githubusercontent.com/1898161/177416593-9fe3616f-04f4-4226-9440-fe17971ba703.png">

Running this in Python 3.9.2 works fine:
<img width="230" alt="CleanShot 2022-07-05 at 22 57 28@2x" src="https://user-images.githubusercontent.com/1898161/177415349-37795433-7e88-4532-b80a-4b0fd39a5328.png">

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