Type 'manage.py help' for usage.
Unknown command: 'validate'
Type 'manage.py help' for usage.

what?

也许你好好检查了一下教程代码，好像没错呀？怎么回事？

嗯。。我告诉你，代码的确没错，只是你可能用错django框架版本，这些语法已经被淘汰掉了，网上教程教程里面的版本很多都是比较老套的，然而你可能装了django1.9，django1.11，或者更高的django2.0了。

这当然会出现错误，那些语法都被淘汰了，系统已经没有了那个命令，所以必须错误。那么新语法时怎样的呢？

你应该用：python manage.py check

xxxx@DESKTOP-Q59QKNV:~/djangoweb$ python manage.py check
System check identified no issues (0 silenced).

也许你像这样，搞定了，完美！

模型确认没问题了，运行下面的命令来生成 CREATE TABLE，运用语句：python manage.py sqlall books

xxxx@DESKTOP-Q59QKNV:~/djangoweb$ python manage.py sqlall books
Unknown command: 'sqlall'
Type 'manage.py help' for usage.

xxxxx@DESKTOP-Q59QKNV:~/djangoweb$ python manage.py sqlmigrate books 0001
BEGIN;
--
-- Create model Author
--
CREATE TABLE "books_author" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "firit_name" varchar(30) NOT NULL, "last_name" varchar(40) NOT NULL, "email" varchar(254) NOT NULL);
--
-- Create model Book
--
CREATE TABLE "books_book" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "title" varchar(100) NOT NULL, "publication_date" date NOT NULL);
CREATE TABLE "books_book_authors" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "book_id" integer NOT NULL REFERENCES "books_book" ("id"), "author_id" integer NOT NULL REFERENCES "books_author" ("id"));
--
-- Create model Publisher
--
CREATE TABLE "books_publisher" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "name" varchar(30) NOT NULL, "address" varchar(50) NOT NULL, "city" varchar(60) NOT NULL, "state_province" varchar(30) NOT NULL, "country" varchar(50) NOT NULL, "website" varchar(200) NOT NULL);
--
-- Add field publisher to book
--
ALTER TABLE "books_book" RENAME TO "books_book__old";
CREATE TABLE "books_book" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "title" varchar(100) NOT NULL, "publication_date" date NOT NULL, "publisher_id" integer NOT NULL REFERENCES "books_publisher" ("id"));
INSERT INTO "books_book" ("publication_date", "publisher_id", "id", "title") SELECT "publication_date", NULL, "id", "title" FROM "books_book__old";
DROP TABLE "books_book__old";
CREATE INDEX "books_book_publisher_id_189e6c56" ON "books_book" ("publisher_id");
COMMIT;

当你看到这些提示时，证明没有问题了。

嗯，完美！完美的版本语法大坑，这是博主在学习过程中遇到的一些问题，这只是一小例子。希望能帮到同样学习django的你们。

博主建议你们可以到网上去找一些比较新的教程去学习，或者网上购买一些比较新的教程书籍，也许会达到事半功倍的效果。

使用老教程学习的确很痛苦，希望你们不要走太多歪路！！