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docs/library: Warn that ustruct doesn't handle spaces in format strings. 

And also add a test to capture the CPython difference.
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Tom McDermott 2019-08-05 21:09:14 +10:00 committed by Damien George
parent d934f8c8a8
commit c1f74b3005
2 changed files with 18 additions and 0 deletions
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5
docs/library/ustruct.rst
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@ -12,6 +12,11 @@ Supported format codes: ``b``, ``B``, ``h``, ``H``, ``i``, ``I``, ``l``,
``L``, ``q``, ``Q``, ``s``, ``P``, ``f``, ``d`` (the latter 2 depending ``L``, ``q``, ``Q``, ``s``, ``P``, ``f``, ``d`` (the latter 2 depending
on the floating-point support). on the floating-point support).
.. admonition:: Difference to CPython
:class: attention
Whitespace is not supported in format strings.
Functions Functions
--------- ---------

13
tests/cpydiff/modules_struct_whitespace_in_format.py Normal file
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@ -0,0 +1,13 @@
"""
categories: Modules,struct
description: Struct pack with whitespace in format, whitespace ignored by CPython, error on uPy
cause: MicroPython is optimised for code size.
workaround: Don't use spaces in format strings.
"""
import struct
try:
print(struct.pack('b b', 1, 2))
print('Should have worked')
except:
print('struct.error')