Python:关于flask框架的flask_scrip._compat

compat是什么

compat 英文单词同胞的意思
compat的功能是在py的不同版本之间做兼容处理

一些py2/py3兼容性支持基于精简版的six，因此我们不必依赖于它的特定版本。

源码

# -*- coding: utf-8 -*-
"""
    flask_script._compat
    ~~~~~~~~~~~~~~~~~~~~
    Some py2/py3 compatibility support based on a stripped down
    version of six so we don't have to depend on a specific version
    of it.
    :copyright: (c) 2013 by Armin Ronacher.
    :license: BSD, see LICENSE for more details.
"""
import sys

PY2 = sys.version_info[0] == 2
PYPY = hasattr(sys, 'pypy_translation_info')
_identity = lambda x: x


if not PY2:
    unichr = chr
    range_type = range
    text_type = str
    string_types = (str, )
    integer_types = (int, )

    iterkeys = lambda d: iter(d.keys())
    itervalues = lambda d: iter(d.values())
    iteritems = lambda d: iter(d.items())

    import pickle
    from io import BytesIO, StringIO
    NativeStringIO = StringIO

    def reraise(tp, value, tb=None):
        if value.__traceback__ is not tb:
            raise value.with_traceback(tb)
        raise value

    ifilter = filter
    imap = map
    izip = zip
    intern = sys.intern

    implements_iterator = _identity
    implements_to_string = _identity
    encode_filename = _identity
    get_next = lambda x: x.__next__

    input = input

else:
    unichr = unichr
    text_type = unicode
    range_type = xrange
    string_types = (str, unicode)
    integer_types = (int, long)

    iterkeys = lambda d: d.iterkeys()
    itervalues = lambda d: d.itervalues()
    iteritems = lambda d: d.iteritems()

    import cPickle as pickle
    from cStringIO import StringIO as BytesIO, StringIO
    NativeStringIO = BytesIO

    exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')

    from itertools import imap, izip, ifilter
    intern = intern

    def implements_iterator(cls):
        cls.next = cls.__next__
        del cls.__next__
        return cls

    def implements_to_string(cls):
        cls.__unicode__ = cls.__str__
        cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
        return cls

    get_next = lambda x: x.next

    def encode_filename(filename):
        if isinstance(filename, unicode):
            return filename.encode('utf-8')
        return filename

    input = raw_input


def with_metaclass(meta, *bases):
    # This requires a bit of explanation: the basic idea is to make a
    # dummy metaclass for one level of class instantiation that replaces
    # itself with the actual metaclass.  Because of internal type checks
    # we also need to make sure that we downgrade the custom metaclass
    # for one level to something closer to type (that's why __call__ and
    # __init__ comes back from type etc.).
    #
    # This has the advantage over six.with_metaclass in that it does not
    # introduce dummy classes into the final MRO.
    class metaclass(meta):
        __call__ = type.__call__
        __init__ = type.__init__
        def __new__(cls, name, this_bases, d):
            if this_bases is None:
                return type.__new__(cls, name, (), d)
            return meta(name, bases, d)
    return metaclass('temporary_class', None, {})


try:
    from urllib.parse import quote_from_bytes as url_quote
except ImportError:
    from urllib import quote as url_quote

Flask版本书写不同

如遇到以下问题：

Traceback (most recent call last):
  File "D:/code/p11/sylpro/main.py", line 1, in 
    from flask_script import Manager,Server
  File "D:\code\p11\sylpro\venv\lib\site-packages\flask_script\__init__.py", line 15, in 
    from flask._compat import text_type
ModuleNotFoundError: No module named 'flask._compat'

可以降低版本至1.1.2及以下，
或者修改到如下图效果：

卸载命令如下
pip uninstall flask==1.1.2 这个是卸载指定版本的
pip uninstall flask 直接卸载python里面的flask也行
12
卸载后到报错的源码里面取改源码
修改一下
flask_script/init.py中
from ._compat import text_type
改成
from flask_script._compat import text_type 。
以上参考：Deng872347348