模块

Generated Wed 03 Jan 2024 12:07:50 UTC

数组

查找为实现整数

参考代码

import array

print(1 in array.array("B", b"12"))

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

检测为实现数组

参考代码

import array

a = array.array("b", (1, 2, 3))
del a[1]
print(a)

CPy 输出	uPy 输出
array('b', [1, 3])	/bin/sh: ../ports/unix/micropython: No such file or directory

Subscript with step != 1 is not yet implemented

参考代码

import array

a = array.array("b", (1, 2, 3))
print(a[3:2:2])

CPy 输出	uPy 输出
array('b')	/bin/sh: ../ports/unix/micropython: No such file or directory

内置

未实现第二个参数 next()

Cause: MicroPython is optimised for code space.

Workaround: Instead of val = next(it, deflt) use:

try:
    val = next(it)
except StopIteration:
    val = deflt

参考代码

print(next(iter(range(0)), 42))

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

队列

队列为实现

Workaround: Use regular lists. micropython-lib has implementation of collections.deque.

参考代码

import collections

D = collections.deque()
print(D)

CPy 输出	uPy 输出
deque([])	/bin/sh: ../ports/unix/micropython: No such file or directory

json

对象序列化时，JSON模块不会抛出异常

参考代码

import json

a = bytes(x for x in range(256))
try:
    z = json.dumps(a)
    x = json.loads(z)
    print("Should not get here")
except TypeError:
    print("TypeError")

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

os

environ 属性未实现

Workaround: Use getenv, putenv and unsetenv

参考代码

import os

try:
    print(os.environ.get("NEW_VARIABLE"))
    os.environ["NEW_VARIABLE"] = "VALUE"
    print(os.environ["NEW_VARIABLE"])
except AttributeError:
    print("should not get here")
    print(os.getenv("NEW_VARIABLE"))
    os.putenv("NEW_VARIABLE", "VALUE")
    print(os.getenv("NEW_VARIABLE"))

CPy 输出	uPy 输出
None VALUE	/bin/sh: ../ports/unix/micropython: No such file or directory

getenv returns actual value instead of cached value

Cause: The environ attribute is not implemented

参考代码

import os

print(os.getenv("NEW_VARIABLE"))
os.putenv("NEW_VARIABLE", "VALUE")
print(os.getenv("NEW_VARIABLE"))

CPy 输出	uPy 输出
None None	/bin/sh: ../ports/unix/micropython: No such file or directory

getenv only allows one argument

Workaround: Test that the return value is None

参考代码

import os

try:
    print(os.getenv("NEW_VARIABLE", "DEFAULT"))
except TypeError:
    print("should not get here")
    # this assumes NEW_VARIABLE is never an empty variable
    print(os.getenv("NEW_VARIABLE") or "DEFAULT")

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

struct结构

Struct pack with too few args, not checked by uPy

参考代码

import struct

try:
    print(struct.pack("bb", 1))
    print("Should not get here")
except:
    print("struct.error")

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

Struct pack with too many args, not checked by uPy

参考代码

import struct

try:
    print(struct.pack("bb", 1, 2, 3))
    print("Should not get here")
except:
    print("struct.error")

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

sys

Overriding sys.stdin, sys.stdout and sys.stderr not possible

Cause: They are stored in read-only memory.

参考代码

import sys

sys.stdin = None
print(sys.stdin)

CPy 输出	uPy 输出
None	/bin/sh: ../ports/unix/micropython: No such file or directory