语法¶

Generated Wed 03 Jan 2024 12:07:50 UTC

操作符¶

MicroPython 允许使用 := 给变量赋值, CPython 会报语法错误.¶

Cause: MicroPython is optimised for code size and doesn’t check this case.

Workaround: Do not rely on this behaviour if writing CPython compatible code.

参考代码

print([i := -1 for i in range(4)])

CPy 输出	uPy 输出
File "<stdin>", line 7 SyntaxError: assignment expression cannot rebind comprehension iteration variable 'i'	/bin/sh: ../ports/unix/micropython: No such file or directory

作用域¶

uPy requires spaces between literal numbers and keywords, CPy doesn’t¶

参考代码

try:
    print(eval("1and 0"))
except SyntaxError:
    print("Should have worked")
try:
    print(eval("1or 0"))
except SyntaxError:
    print("Should have worked")
try:
    print(eval("1if 1else 0"))
except SyntaxError:
    print("Should have worked")

CPy 输出	uPy 输出
0 1 1	/bin/sh: ../ports/unix/micropython: No such file or directory

Unicode¶

Unicode name escapes are not implemented¶

参考代码

print("\N{LATIN SMALL LETTER A}")

CPy 输出	uPy 输出
a	/bin/sh: ../ports/unix/micropython: No such file or directory