from?IPython.core.magic?import?(
????magics_class,
????Magics,
????line_magic,
????cell_magic
)


@magics_class
class?MagicOrder(Magics):
????"""
????自定義一個類，類名叫什么無所謂
????但要繼承?Magics，并且要被?magics_class?裝飾
????"""

????@line_magic
????def?hello(self,?line):
????????"""
????????在 jupyter 中就可以使用如下命令，比如：
????????%hello?<Your?Code>，然后就會調(diào)用這個?hello?方法
????????參數(shù)?line?就是?%hello?后面的代碼
????????"""
????????print(f"line:?{line}")

????@cell_magic
????def?world(self,?line,?cell):
????????"""
????????在 jupyter 中就可以使用如下命令，比如：
????????%%world
????????<Your?Code>
????????<Your?Code>
????????...

????????然后就會調(diào)用這個?world?方法
????????參數(shù)?cell?就是?%%world?下面整個單元格的代碼

????????然后還有一個參數(shù)?line，它表示?%%world?所在行后面的代碼
????????但對于?%%?開頭的命令來說，我們一般都會新起一行，然后寫代碼
????????所以?line?這個參數(shù)暫時用不到
????????"""
????????print(f"line:?\n{line}")
????????print("-----------------")
????????print(f"cell:?\n{cell}")


#?必須定義?load_ipython_extension?函數(shù)
#?%load_ext?本質(zhì)上也是加載一個模塊
#?但它會自動調(diào)用該函數(shù)
def?load_ipython_extension(ip):
????#?在函數(shù)內(nèi)部，我們將類?MagicOrder?注冊進去
????#?然后就可以使用它內(nèi)部的魔法命令了
????ip.register_magics(MagicOrder)

#?如果不定義此函數(shù)，那么使用?%load_ext?加載時會報錯
#?The?xxx?module?is?not?an?IPython?extension.

@magics_class
class?MagicOrder(Magics):

????@line_magic
????def?hello(self,?line):
????????exec(line)

????@cell_magic
????def?world(self,?line,?cell):
????????exec(cell)

from?IPython.core.magic?import?(
????magics_class,
????Magics,
????line_magic,
????cell_magic,
????needs_local_scope
)


@magics_class
class?MagicOrder(Magics):

????@line_magic
????def?hello(self,?line):
????????#?通過?self.shell.user_ns
????????#?可以拿到當前?shell?的名字空間
????????#?注意：包含所有的單元格
????????local_ns?=?self.shell.user_ns
????????#?在?local_ns?當中執(zhí)行代碼
????????exec(line,?local_ns,?local_ns)

????@needs_local_scope
????@cell_magic
????def?world(self,?line,?cell,?local_ns):
????????#?或者通過?needs_local_scope?裝飾器
????????#?這樣在調(diào)用函數(shù)的時候，會額外傳遞一個?local_ns?參數(shù)
????????#?該參數(shù)和?self.shell.user_ns?等價
????????exec(cell,?local_ns,?local_ns)

def?load_ipython_extension(ip):
????ip.register_magics(MagicOrder)

@magics_class
class?MagicOrder(Magics):

????@needs_local_scope
????@line_magic
????def?my_time(self,?line,?local_ns):
????????start?=?time.perf_counter()
????????exec(line,?local_ns,?local_ns)
????????end?=?time.perf_counter()
????????print(f"總耗時:?{round(end?-?start,?3)}")

from?IPython.core.magic?import?(
????magics_class,
????Magics,
????cell_magic,
????needs_local_scope
)
from?IPython.core?import?magic_arguments


@magics_class
class?MagicOrder(Magics):
????@magic_arguments.magic_arguments()
????#?在?jupyter?中可以通過?-n=xxx?或者?--name=xxx
????#?然后是?dest="name"，用于指定參數(shù)的名字
????#?后續(xù)便可以通過?name?字段來獲取該參數(shù)的值
????@magic_arguments.argument(
????????"-n",?"--name",?dest="name",?default="satori"
????)
????#?"-"?和?"--"?可以只出現(xiàn)一個，并且默認解析得到的是字符串
????#?而?age?我們希望是整數(shù)，所以指定?type?為?int
????#?解析完參數(shù)之后，會自動調(diào)用?int?進行轉(zhuǎn)化
????#?如果不指定該參數(shù)，則使用?default
????#?而這里沒有?default，那么結(jié)果就是?None
????@magic_arguments.argument(
????????"--age",?dest="age",?type=int
????)
????@magic_arguments.argument(
????????"-h",?"--hobby",?dest="hobby",?default=[],
????????action="append"
????)
????@needs_local_scope
????@cell_magic
????def?order(self,?line,?cell,?local_ns):
????????#?顯然?line?就是可選參數(shù)，cell?就是代碼塊
????????exec(cell,?local_ns,?local_ns)
????????#?解析參數(shù)
????????args?=?magic_arguments.parse_argstring(
????????????self.order,?line)
????????#?打印
????????print(args)


def?load_ipython_extension(ip):
????ip.register_magics(MagicOrder)