micropython/tests/cpydiff/core_fstring_concat.py

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"""
categories: Core
description: f-strings don't support concatenation with adjacent literals if the adjacent literals contain braces or are f-strings
cause: MicroPython is optimised for code space.
workaround: Use the + operator between literal strings when either or both are f-strings
"""
x, y = 1, 2
print("aa" f"{x}") # works
print(f"{x}" "ab") # works
print("a{}a" f"{x}") # fails
print(f"{x}" "a{}b") # fails
print(f"{x}" f"{y}") # fails