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CPython mandates more attributes for this object, but the actual useful bare minimum is
implemented in MicroPython.
sys.maxsize
Maximum value which a native integer type can hold on the current platform, or maximum
value representable by MicroPython integer type, if it’s smaller than platform max value (that
is the case for MicroPython ports without long int support).
This attribute is useful for detecting "bitness" of a platform (32-bit vs 64-bit, etc.). It’s
recommended to not compare this attribute to some value directly, but instead count number
of bits in it:
bits = 0
v = sys.maxsize
while v:
bits += 1
v >>= 1
if bits > 32 :
# 64-bit (or more) platform
else :
# 32-bit (or less) platform
# Note that on 32-bit platform, value of bits may be less than 32
# (e.g. 31) due to peculiarities described above, so use "> 16",
# "> 32", "> 64" style of comparisons.
sys.modules
Dictionary of loaded modules. On some ports, it may not include builtin modules.
sys.path
A mutable list of directories to search for imported modules.
sys.platform
The platform that MicroPython is running on. For OS/RTOS ports, this is usually an identifier
of the OS, e.g.
linux
. For baremetal ports, it is an identifier of a board, e.g.
pyboard
for
the original MicroPython reference board. It thus can be used to distinguish one board from
another. If you need to check whether your program runs on MicroPython (vs other Python
implementation), use
sys.implementation
instead.
sys.stderr
Standard error stream.
sys.stdin
Standard input stream.
5.3.3 sys
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