Windows cmd: piping python3.5py文件结果工作，但pyinstaller exe的指向UnicodeEncodeError

Question

我在这里有点别无选择...

# -*- coding: utf-8 -*-
print(chr(246) + " " + chr(9786) + " " + chr(9787))
print("End.")

当我在我的Win7命令窗口中运行上面提到的代码时，我得到的结果取决于我调用它的方式：

python.exe utf8.py
-> ö ☺ ☻

python.exe utf8.py >test.txt
-> ö ☺ ☻ (in file)

utf8.exe
-> ö ☺ ☻

utf8.exe >test.txt
RuntimeWarning: sys.stdin.encoding == 'utf-8', whereas sys.stdout.encoding == 'cp1252', readline hook consumer may assume they are the same
Traceback (most recent call last):
  File "Development\utf8.py", line 15, in <module>
    print(chr(246) + " " + chr(9786) + " " + chr(9787))
  File "C:\python35\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u263a' in position 

摆弄win_unicode_console也于事无补。最后，我得到了同样的结果。

PYTHONIOENCODING=utf-8

已设置。但是，似乎在使用PyInstaller时，对于stdout.encoding，该参数被忽略：

print(sys.stdout.encoding)
print(sys.stdout.isatty())
print(locale.getpreferredencoding())
print(sys.getfilesystemencoding())
print(os.environ["PYTHONIOENCODING"])

输出：

python.exe utf8.py > test.txt
utf-8
False
cp1252
mbcs
utf-8

utf8.exe >test.txt
cp1252
False
cp1252
mbcs
utf-8

问题是:这是如何发生的？还有:我该如何解决这个问题呢？

codecs.getwriter([something])(sys.stdout)

似乎是不鼓励的，因为它可能会导致模块的输出中断。或者有没有可能强制将其转换为utf-8，以防我们对tty进行检查？更好的是:如何在PyInstaller中修复这个问题？

先谢谢你...

Answer 1

多亏了eryksun，以下解决方法正在运行：

STDOUT_ENCODING = str(sys.stdout.encoding)
try:
    PYTHONIOENCODING = str(os.environ["PYTHONIOENCODING"])
except:
    PYTHONIOENCODING = False

# Remark: In case the stdout gets modified, it will only append all information
# that has been written into the pipe until that very moment.
if sys.stdout.isatty() is False:
    print("Program is running in piping mode. (sys.stdout.isatty() is " + str(sys.stdout.isatty()) + ".)")
    if PYTHONIOENCODING is not False:
        print("PYTHONIOENCODING is set to a value. ('" + str(PYTHONIOENCODING) + "')")
        if str(sys.stdout.encoding) != str(PYTHONIOENCODING):
            print("PYTHONIOENCODING is differing from stdout encoding. ('" + str(PYTHONIOENCODING) + "' != '" + STDOUT_ENCODING + "'). This should normally not happen unless the PyInstaller setup is still broken. Setting hard utf-8 workaround.")
            sys.stdout = open(sys.stdout.fileno(), 'w', encoding='utf-8', closefd=False)
            print("PYTHONIOENCODING was differing from stdout encoding. ('" + str(PYTHONIOENCODING) + "' != '" + STDOUT_ENCODING + "'). This should normally not happen unless PyInstaller is still broken. Setting hard utf-8 workaround. New encoding: '" + str(PYTHONIOENCODING) + "'.", "D")
        else:
            print("PYTHONIOENCODING is equal to stdout encoding. ('" + str(PYTHONIOENCODING) + "' == '" + str(sys.stdout.encoding) + "'). - All good.")
    else:
        print("PYTHONIOENCODING is set False. ('" + str(PYTHONIOENCODING) + "'). - Nothing to do.")
else:
    print("Program is running in terminal mode. (sys.stdout.isatty() is " + str(sys.stdout.isatty()) + ".) - All good.")

尝试设置一个新的PyInstaller-Environment，看看是否可以从头开始修复它。