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(你的Python解釋器安裝目錄或者虛擬環(huán)境目錄)\django21\Lib\site-packages\django\db\backends\mysql\base.py

"""
MySQL database backend for Django.

Requires mysqlclient: https://pypi.org/project/mysqlclient/  # 之前沒安裝的話得從pypi中下載mysqlclient包
"""
import re

from django.core.exceptions import ImproperlyConfigured
from django.db import utils
from django.db.backends import utils as backend_utils
from django.db.backends.base.base import BaseDatabaseWrapper
from django.utils.functional import cached_property

try:
    import MySQLdb as Database  # 導(dǎo)入MySQLdb模塊
except ImportError as err:
    raise ImproperlyConfigured(
        'Error loading MySQLdb module.\n'
        'Did you install mysqlclient?'
    ) from err

from MySQLdb.constants import CLIENT, FIELD_TYPE                # isort:skip
from MySQLdb.converters import conversions                      # isort:skip

# Some of these import MySQLdb, so import them after checking if it's installed.
from .client import DatabaseClient                          # isort:skip
from .creation import DatabaseCreation                      # isort:skip
from .features import DatabaseFeatures                      # isort:skip
from .introspection import DatabaseIntrospection            # isort:skip
from .operations import DatabaseOperations                  # isort:skip
from .schema import DatabaseSchemaEditor                    # isort:skip
from .validation import DatabaseValidation                  # isort:skip

version = Database.version_info
# 打印一下這個version
print("version>>>>>>",version)

if version < (1, 3, 7):
    raise ImproperlyConfigured('mysqlclient 1.3.7 or newer is required; you have %s.' % Database.__version__)

###################
and so on...

try:
    import MySQLdb as Database
    # 打印一下這個Database
    print(Database,type(Database))
except ImportError as err:
    raise ImproperlyConfigured(
        'Error loading MySQLdb module.\n'
        'Did you install mysqlclient?'
    ) from err

import pymysql  # 導(dǎo)入模塊相當于執(zhí)行了這個包中的__init__.py文件

pymysql.install_as_MySQLdb()  # 執(zhí)行pymysql的install_as_MySQLdb方法

"""
PyMySQL: A pure-Python MySQL client library.

### 說明略去
"""
import sys

from ._compat import PY2
from .constants import FIELD_TYPE
from .converters import escape_dict, escape_sequence, escape_string
from .err import (
    Warning, Error, InterfaceError, DataError,
    DatabaseError, OperationalError, IntegrityError, InternalError,
    NotSupportedError, ProgrammingError, MySQLError)
from .times import (
    Date, Time, Timestamp,
    DateFromTicks, TimeFromTicks, TimestampFromTicks)

# pymysql的版本
VERSION = (0, 9, 3, None)
if VERSION[3] is not None:
    VERSION_STRING = "%d.%d.%d_%s" % VERSION
else:
    VERSION_STRING = "%d.%d.%d" % VERSION[:3]
threadsafety = 1
apilevel = "2.0"
paramstyle = "pyformat"


class DBAPISet(frozenset):

    # 省略

# 省略

def Binary(x):
    """Return x as a binary type."""
    # 省略

def Connect(*args, **kwargs):
    """
    Connect to the database; see connections.Connection.__init__() for
    more information.
    """
    # 省略

from . import connections as _orig_conn
if _orig_conn.Connection.__init__.__doc__ is not None:
    Connect.__doc__ = _orig_conn.Connection.__init__.__doc__
del _orig_conn


def get_client_info():  # for MySQLdb compatibility
    version = VERSION
    if VERSION[3] is None:
        version = VERSION[:3]
    return '.'.join(map(str, version))

connect = Connection = Connect

# we include a doctored version_info here for MySQLdb compatibility
version_info = (1, 3, 12, "final", 0)

NULL = "NULL"

__version__ = get_client_info()

def thread_safe():
    return True  # match MySQLdb.thread_safe()


### 這里是最關(guān)鍵的
def install_as_MySQLdb():
    """
    After this function is called, any application that imports MySQLdb or
    _mysql will unwittingly actually use pymysql.
    """
 ### 導(dǎo)入MySQLdb、_mysql其實相當于導(dǎo)入了pymysql模塊?。?！
    sys.modules["MySQLdb"] = sys.modules["_mysql"] = sys.modules["pymysql"]


__all__ = [
    # 略去
]

pip install pymysql==0.9.3 -i https://pypi.douban.com/simple

[root@mycentos ~]# /opt/py3.6/ve1/bin/pip  install  xxx.whl

tar -xzvf  xxx.tar.gz
cd xxx

/opt/py3.6/ve1/bin/python setup.py install

import pymysql

### 自己設(shè)置pymysql的version_info
pymysql.version_info  = (1, 3, 15, "final", 0)

pymysql.install_as_MySQLdb()