Syntax¶
Generated Wed 02 Sep 2020 04:41:19 UTC
Operators¶
MicroPython allows using := to assign to the variable of a comprehension, CPython raises a SyntaxError.¶
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.
Sample code:
print([i := -1 for i in range(4)])
CPy output: |
uPy output: |
File "<stdin>", line 7
print([i := -1 for i in range(4)])
^
SyntaxError: invalid syntax
|
[-1, -1, -1, -1]
|
Spaces¶
uPy requires spaces between literal numbers and keywords, CPy doesn’t¶
Sample code:
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 output: |
uPy output: |
0
1
1
|
Should have worked
Should have worked
Should have worked
|