ModuleNotFoundError: No module named 'MySQLdb'

问题

After finishing of one of my Flask projects, I uploaded it on github just like everybody else. after a 2-3 months period I downloaded the entire githube repository on another machine to run it. However, the app is not working because the packages are not found giving the following message

ModuleNotFoundError: No module named 'Flask'

So I ended up downloading all packages starting from Flask, SQLalchemy,..etc! but I got stuck with MySQLdb:

(MYAPPENV) C:\Users\hp\myapp>python run.py
Traceback (most recent call last):
  File "run.py", line 1, in <module>
    from app import app
  File "C:\Users\hp\myapp\app\__init__.py", line 4, in <module>
    from instance.config import engine
  File "C:\Users\hp\myapp\instance\config.py", line 52, in <module>
    engine = create_engine("mysql://root:root@localhost/MYAPPDB")
  File "C:\Users\hp\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\engine\__init__.py", line 425, in create_engine
return strategy.create(*args, **kwargs)
  File "C:\Users\hp\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\engine\strategies.py", line 81, in create
dbapi = dialect_cls.dbapi(**dbapi_args)
  File "C:\Users\hp\AppData\Local\Programs\Python\Python37-32\lib\site-packages\sqlalchemy\dialects\mysql\mysqldb.py", line 102, in dbapi
    return __import__('MySQLdb')
ModuleNotFoundError: No module named 'MySQLdb'

Could anybody please help with this issue? I am using python37 on windows machine. I even tried downloading packages such as mysqlclient,..etc but it didn't work out.

回答1:

I have read that mysqldb is not supported by python3

And it looks like when you are trying to connect to your database you are using mysql db to connect to the database by default!

you need to change it by editing your DATABASE_URI configuration

But before you need to install the connector extension :

with this command :

pip install mysql-connector-python

And according to this documentation you can edit your DATABSE_URI and change the default connector like this :

DATABSE_URI='mysql+mysqlconnector://{user}:{password}@{server}/{database}'.format(user='your_user', password='password', server='localhost', database='dname')

I hope this will help...

回答2:

To install MySQLdb, provided pip or pip3 is installed on your machine:

pip install mysqlclient

回答3:

You can install mysqlclient with pip

try this:

pip3 install mysqlclient

or

pip install mysqlclient in python2

回答4:

import pymysql
pymysql.install_as_MySQLdb()

回答5:

i have the same problem like you.my solution like this,wish it can help you:

1.reason:python3.X not support MySQLdb,change to pymysql model 2.solution: change the content of import.

1):

replace all MySQLdb with pymysql

2):

def reconnect(self):
    """Closes the existing database connection and re-opens it."""
    self.close()
    self._db = pymysql.connect(**self._db_args)# MySQLdb.connect(**self._db_args)
    self._db.autocommit(True)

3)

if pymysql is not None:
    # Fix the access conversions to properly recognize unicode/binary
    FIELD_TYPE = pymysql.connections.FIELD_TYPE # MySQLdb.constants.FIELD_TYPE
    FLAG = pymysql.constants.FLAG# MySQLdb.constants.FLAG
    CONVERSIONS = copy.copy (pymysql.converters.conversions)# (MySQLdb.converters.conversions)

    field_types = [FIELD_TYPE.BLOB, FIELD_TYPE.STRING, FIELD_TYPE.VAR_STRING]
    if 'VARCHAR' in vars(FIELD_TYPE):
        field_types.append(FIELD_TYPE.VARCHAR)

    for field_type in field_types:
        # CONVERSIONS[field_type] = [(FLAG.BINARY, str)] + CONVERSIONS[field_type]
        CONVERSIONS[field_type] = [(FLAG.BINARY, str)].append(CONVERSIONS[field_type])

    # Alias some common MySQL exceptions
    IntegrityError = pymysql.IntegrityError# MySQLdb.IntegrityError
    OperationalError = pymysql.OperationalError# MySQLdb.OperationalError

4):

def __init__(self, host, database, user=None, password=None,
                 max_idle_time=7 * 3600, connect_timeout=10,# 设置连接超时时间，时间是秒
                 time_zone="+0:00", charset = "utf8", sql_mode="TRADITIONAL"):

5):

def query(self, query, *parameters, **kwparameters):
    """Returns a row list for the given query and parameters."""
    cursor = self._cursor()
    try:
        self._execute(cursor, query, parameters, kwparameters)
        column_names = [d[0] for d in cursor.description]
        return [Row(itertools.zip_longest(column_names, row)) for row in cursor]
    finally:
        cursor.close()

来源：https://stackoverflow.com/questions/53024891/modulenotfounderror-no-module-named-mysqldb