kopia lustrzana https://github.com/micropython/micropython
83 wiersze
1.9 KiB
Python
83 wiersze
1.9 KiB
Python
def f():
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return 4
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def g(_):
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return 5
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def h():
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return 6
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print(f'no interpolation')
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print(f"no interpolation")
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print(f"""no interpolation""")
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x, y = 1, 2
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print(f'{x}')
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print(f'{x:08x}')
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print(f'a {x} b {y} c')
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print(f'a {x:08x} b {y} c')
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print(f'a {"hello"} b')
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print(f'a {f() + g("foo") + h()} b')
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def foo(a, b):
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return f'{x}{y}{a}{b}'
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print(foo(7, 8))
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# ':' character within {...} that should not be interpreted as format specifiers.
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print(f"a{[0,1,2][0:2]}")
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print(f"a{[0,15,2][0:2][-1]:04x}")
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# Nested '{' and '}' characters.
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print(f"a{ {0,1,2}}")
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# PEP-0498 specifies that '\\' and '#' must be disallowed explicitly, whereas
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# MicroPython relies on the syntax error as a result of the substitution.
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print(f"\\")
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print(f'#')
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try:
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eval("f'{\}'")
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except SyntaxError:
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print('SyntaxError')
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try:
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eval("f'{#}'")
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except SyntaxError:
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print('SyntaxError')
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# PEP-0498 specifies that handling of double braces '{{' or '}}' should
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# behave like str.format.
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print(f'{{}}')
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print(f'{{{4*10}}}', '{40}')
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# A single closing brace, unlike str.format should raise a syntax error.
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# MicroPython instead raises ValueError at runtime from the substitution.
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try:
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eval("f'{{}'")
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except (ValueError, SyntaxError):
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# MicroPython incorrectly raises ValueError here.
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print('SyntaxError')
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# Allow literal tuples
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print(f"a {1,} b")
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print(f"a {x,y,} b")
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print(f"a {x,1} b")
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# f-strings with conversion specifiers (only support !r and !s).
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a = "123"
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print(f"{a!r}")
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print(f"{a!s}")
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try:
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eval('print(f"{a!x}")')
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except (ValueError, SyntaxError):
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# CPython detects this at compile time, MicroPython fails with ValueError
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# when the str.format is executed.
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print("ValueError")
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# Mixing conversion specifiers with formatting.
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print(f"{a!r:8s}")
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print(f"{a!s:8s}")
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# Still allow ! in expressions.
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print(f"{'1' if a != '456' else '0'!r:8s}")
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print(f"{'1' if a != '456' else '0'!s:8s}")
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