The mysqldb Ansible module will fail if the state specified is import or dump with a '1045: Access Denied' mysql error for complex passwords.
This is caused by the extra quote around the '--password' argument to mysqldump, as pipes.quotes already quotes the password string.
>>> "--password='%s'" % pipes.quote('simple')
"--password='simple'"
>>> "--password='%s'" % pipes.quote('c0mplexp@ssword!')
"--password=''c0mplexp@ssword!''"
>>> "--password='%s'" % pipes.quote('password with space')
"--password=''password with space''"
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