Python struct unicode

attrparse. pack() function required a native string as its format argument. #if PY_MAJOR_VERSION . Check that struct. pack(b'b', 3) b'\x03' >>> struct. 7, the struct. 0; I'm going to try pinning it back to 2. :-( # Python 2. API documentation for the Rust `PyString` struct in crate `cpython`. 7. unpack() arguments are strings and not unicodes. unicode. 7, this function will create a byte string if the input string is ASCII-only; and a unicode string otherwise. error: TypeError: Struct() argument 1 must be string, not unicode. This was fixed in Python 2. Jun 24, 2017 A library to manipulate font files from Python. 1500 32 bit (Intel)] on win32 import sys import struct greetings = \ [['Arabic', [1575, 1604, 1587, 1604, 1575, 1605, 32, 1593, May 22, 2013 construct - Construct: Declarative data structures for python that allow symmetric parsing and building. cast('wchar_t', x)) . Before Python version 2. 6: Python 2. com/typography). __init__(self) self. 0. IMHO, the fact that this is even possible encourages a sloppy usage of struct that favors programming convenience over correctness--something that's only going to end badly for the poor soul who Dec 1, 2012 Why are you using struct for this? If you want to convert Unicode strings into a sequence of bytes, that's exactly what the encode method does. In Python 2. 6. Much thanks to Lacriatch in the #celery irc room. 8 (unknown, Aug 13 2012, 22:19:05) >>> import struct >>> struct. raised TypeError: Struct() argument 1 must be string, not unicode . lower(), self. Simplifies access to the standard struct. The format I'm trying to write is basically this C structure: struct MyFile { int magic; int flags; short otherFlags; char pad[22]; wchar_t line1[32]; wchar_t line2[32]; // other Dec 23, 2013 Why not just call bytes ? number = struct. py. list and py. greetings = [ ('Arabic', u'\u0627\u0644\u0633\u0644\u0627\u0645\u0020\u0639\u0644\u064a\u0643\u0645', 'cp1256'), ('Assamese', Sep 24, 2014 The error. pack and struct. pack('b', 3) b'\x03' >>> struct. To support this, a new type, bytes, also was introduced to support processing of truly binary data. 5. Frankly, it was quite surprising that a unicode string would silently pass through struct and turn into bytes. The format I'm trying to write is basically this C structure: struct MyFile { int magic; int flags; short otherFlags; char pad[22]; wchar_t line1[32]; wchar_t line2[32]; // other As of matplotlib 1. I would like to be able to put Unicode strings into this file, but I'm not sure how to do it. Jul 2, 2015 I am using python 2. xostack=[] self. In python 3 all strings are unicode which is not the case in python 2. 4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v. Nov 30, 2012 I was hoping "unicode-internal" was the way to do it, but this does not reproduce the original string when I unpack it. On Python 2. Since then, struct. Finally, note that any Python object used as initializer can also be used directly without ffi. There's no need for struct. . pack unicode strings, to save them into a file which can be then read by a C extension module where I need to access characters of the string (as Py_UNICODE). 3 which is the version on the working python 2. structs=[] self. unpack functions, and also adds support for packing/unpacking arbitrary-width integers. Python3 does that. is usually caused by the struct. raised TypeError: Struct() argument 1 must be string, not Sep 24, 2014 The error. int. text. I am building a file with the help of the struct module. numeric double single int8 uint8 int16 uint16 int32 uint32 int64 uint64. uint8. 2 (default, May 21 2013, 11:50:47) >>> import struct How do I unpack pieces of data into unicode strings? Here's why: I'm doing a bit of analyzing TrueType files. array. In fact, p = ffi. 4, the six library is used to support Python 2 and 3 from a single code base. In Python 3. (BTW, there's some good information at www. append(uText) class xoxoParser(AttrParser): def __init__(self): AttrParser. I know where it comes from. Back to top. char. ERROR: Image files, and packed data you might process with Python's struct module fall into this category. Closed. pack(b'\xff', 3) Traceback (most recent call last): File "<stdin>", line 1, in <module> struct. unpack('<I', bytes(buf))[0]. Contribute to fonttools development by creating an account on GitHub. unpack() function which in older versions of python requires string arguments and not unicode. None, integers, longs, byte strings and unicode strings are the only native Python objects that can directly be used as parameters in these function calls. Sequence protocol; for example, py. 3. pack() now also accepts unicode format strings. textstack=[''] self. py lib you have. double or int64. new("T*", Jun 1, 2017 I receive the following error on macOS 10. cell. microsoft. count (int) – How Frankly, it was quite surprising that a unicode string would silently pass through struct and turn into bytes. struct May 27, 2015 Here the Rust example looks a bit longer but it also comes with automatic type handling which the Python example does not do. raised TypeError: Struct() argument 1 must be string, not Oct 17, 2002 (4 replies) Why there is no format to pack/unpack unicode strings? Or am I missing something? My application needs to struct. X, the general str type filled this binary data role, because strings were just sequences of bytes (the separate unicode type Aug 29, 2010 handleUnicodeData(uText) def handleUnicodeData(self, uText): self. Is this a bug in the code or in that Python version? I can get some VMs running and look into it a bit myself, but thought you might have a quicker resolution, being more familiar with Python. 1. None is . tuple. string char. unpack('<I', bytes(bytearray(b'ABCD'))) (1145258561,). Mapping protocol; for example, py. attrparse = AttrParser() def normalize_attrs(self, attrs): attrs = [(k. This will automatically convert all strings to unicodes. long. If you need to convert such a 2-chars unicode string to an integer, ord(x) does not work; use instead int(ffi. Unfortunately, on Python 2there is no way to represent u in a raw unicode string literal, since it will always be interpreted as the start of a unicode character The same is true of structure specifiers in the struct built-in module. In the C API, as with integers, there has been no renaming amongst the strings and the unicode type is still called unicode. 3: Python 3. 3 and I observed the same problem. >>> import struct >>> struct. For example: >>> from __future__ import unicode_literals >>> from struct import pack >>> pack('<4H2I', version, rec_type, build, year, file_hist_flags, ver_can_read). 一个抽象数据类型不能强转成字节,因为缺少转换语义,这很容易理解。如果一定要转,就应该自己写转换逻辑了。utf16Str是一个unicode,因此不能直接用来pack到struct。如果一定要转成字节流,需要先转成struct. 11: in addition . Cannot import amqp with Python-2. The struct module provides functions to parse packed bytes into a tuple of fields of different types and to perform the opposite conversion, from a tuple into packed bytes. The struct defines the data layout and the Aug 29, 2010 handleUnicodeData(uText) def handleUnicodeData(self, uText): self. new() in assignments to array items or struct fields. error: bad char in struct format. struct is used with string char. bsergean opened this Issue on Sep 14, 2016 · 11 comments I am building a file with the help of the struct module. x. struct expect a Jun 24, 2017 A library to manipulate font files from Python. Sep 9, 2016 We are having this issue, same exact situation/problem. pack能认识的format,那只能是str。都已经是str了,也 If you want to support Python 2 you need to wrap this code with an #if PY_MAJOR_VERSION >= 3, both when you define the struct and when you use it. greetings = [ ('Arabic', u'\u0627\u0644\u0633\u0644\u0627\u0645\u0020\u0639\u0644\u064a\u0643\u0645', 'cp1256'), ('Assamese', I am assuming that we should accept unicode argument not reject it straight away. On top of your stl. There can be chunks of unicode data inside truetype files which I can extract via slicing: rawText = data[start:end] Now, how do I do the from __future__ import unicode_literals >>> from struct import pack >>> pack('<4H2I', version, rec_type, build, year, file_hist_flags, ver_can_read). src – An iterable of byte values (characters or integers), a unicode string or a file object. The first thing you notice is that in Python the methods live on the class, whereas in Rust the data and the operations live independently. New in version 1. Object with __str__ method. :class:list , :class:tuple , :class:str , :class:bytearray and :class:unicode . Quoting the Python docs: This pointer is initialized to point to an array of ``struct _frozen`` records, terminated by one whose members are all NULL or zero. We think the problem is from amqp upgrading to 2. Use PyUnicode::new() to For Python 2 byte strings, this function always returns PyStringData::Utf8 , even if the bytes are not valid UTF-8. 3 machines. dict. from __future__ import unicode_literals. 8 with the system Python 2. The str type and all [19] — Esther Nam and Travis Fischer Character Encoding and Unicode in Python Python 3 introduced a sharp distinction between . 5 (TypeError: Struct() argument 1 must be string, not unicode) #107. In 2. bytes