MicroPython v1.10官方文档：嵌入式Python开发指南

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MicroPython文档（v1.10）是针对嵌入式Python开发的重要参考资料，发布于2019年1月25日，由Damien P. George、Paul Sokolovsky及其他贡献者共同编撰。此版本主要关注MicroPython在各种系统和硬件平台（如EPS8266）上的应用，提供了一系列核心库和模块的详细说明。文档详细介绍了1.10版中MicroPython的标准库和微库，包括： 1. **Python标准库与微库**：这部分涵盖了内置函数和异常处理、数组操作（array）、数学函数支持（cmath）、内存管理（gc）、基本数学功能（math）、系统特定功能（sys）、二进制和ASCII转换（ubinascii）、容器类型（ucollections）、系统错误代码（uerrno）等。 2. **高级库**： - **哈希算法**：uhashlib - **堆队列算法**：uheapq - **输入/输出流**：uio，用于数据读写操作 - **JSON编码和解码**：ujson - **基础操作系统服务**：uos，提供设备驱动和系统资源管理功能 - **正则表达式**：ure - **事件等待**：uselect，用于文件系统的异步事件处理 - **网络模块**：usocket，支持套接字通信 - **安全套接字层/传输层安全**：ussl，提供SSL/TLS支持 - **数据结构和类型**：ustruct，用于打包和解析原始数据类型 - **时间相关函数**：utime，提供计时和定时器功能这些库覆盖了MicroPython在嵌入式环境中的核心功能，使得开发者能够利用MicroPython进行高效、小巧且功能丰富的应用程序开发，尤其是在资源受限的物联网设备上。通过学习和理解这些文档，开发者可以充分利用MicroPython在物联网、单片机等领域的潜力。

MicroPython Documentation, Release 1.10

math.expm1(x)

Return exp(x) -1.

math.fabs(x)

Return the absolute value of x.

math.floor(x)

Return an integer, being x rounded towards negative inﬁnity.

math.fmod(x, y)

Return the remainder of x/y.

math.frexp(x)

Decomposes a ﬂoating-point number into its mantissa and exponent. The returned value is the tuple (m,e)

such that x == m

e exactly. If x == 0 then the function returns (0.0,0), otherwise the relation

0.5 <= abs(m) < 1 holds.

math.gamma(x)

Return the gamma function of x.

math.isfinite(x)

Return True if x is ﬁnite.

math.isinf(x)

Return True if x is inﬁnite.

math.isnan(x)

Return True if x is not-a-number

math.ldexp(x, exp)

Return x

exp).

math.lgamma(x)

Return the natural logarithm of the gamma function of x.

math.log(x)

Return the natural logarithm of x.

math.log10(x)

Return the base-10 logarithm of x.

math.log2(x)

Return the base-2 logarithm of x.

math.modf(x)

Return a tuple of two ﬂoats, being the fractional and integral parts of x. Both return values have the same sign

as x.

math.pow(x, y)

Returns x to the power of y.

math.radians(x)

Return degrees x converted to radians.

math.sin(x)

Return the sine of x.

math.sinh(x)

Return the hyperbolic sine of x.

math.sqrt(x)

Return the square root of x.

8 Chapter 1. MicroPython libraries

MicroPython Documentation, Release 1.10

1.1.7 ubinascii – binary/ASCII conversions

This module implements a subset of the corresponding CPython module, as described below. For more information,

refer to the original CPython documentation: binascii.

This module implements conversions between binary data and various encodings of it in ASCII form (in both direc-

tions).

Functions

ubinascii.hexlify(data[, sep ])

Convert binary data to hexadecimal representation. Returns bytes string.

Difference to CPython

If additional argument, sep is supplied, it is used as a separator between hexadecimal values.

ubinascii.unhexlify(data)

Convert hexadecimal data to binary representation. Returns bytes string. (i.e. inverse of hexlify)

ubinascii.a2b_base64(data)

Decode base64-encoded data, ignoring invalid characters in the input. Conforms to RFC 2045 s.6.8. Returns a

bytes object.

ubinascii.b2a_base64(data)

Encode binary data in base64 format, as in RFC 3548. Returns the encoded data followed by a newline character,

as a bytes object.

1.1.8 ucollections – collection and container types

This module implements a subset of the corresponding CPython module, as described below. For more information,

refer to the original CPython documentation: collections.

This module implements advanced collection and container types to hold/accumulate various objects.

Classes

ucollections.deque(iterable, maxlen[, ﬂags ])

Deques (double-ended queues) are a list-like container that support O(1) appends and pops from either side of

the deque. New deques are created using the following arguments:

•iterable must be the empty tuple, and the new deque is created empty.

•maxlen must be speciﬁed and the deque will be bounded to this maximum length. Once the deque is full,

any new items added will discard items from the opposite end.

•The optional ﬂags can be 1 to check for overﬂow when adding items.

As well as supporting bool and len, deque objects have the following methods:

deque.append(x)

Add x to the right side of the deque. Raises IndexError if overﬂow checking is enabled and there is no

more room left.

deque.popleft()

Remove and return an item from the left side of the deque. Raises IndexError if no items are present.

1.1. Python standard libraries and micro-libraries 11

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