Ipython的魔术命令——？%

Python中的 ？

python中一切皆对象

• Python对象+？
  显示对象的基本信息

• Python对象+？？
  如果是函数显示函数源码

x=1

x?

我把查到的信息摘录如下

Type:        int
String form: 1
Docstring:  
int(x=0) -> integer
int(x, base=10) -> integer

Convert a number or string to an integer, or return 0 if no arguments
are given.  If x is a number, return x.__int__().  For floating point
numbers, this truncates towards zero.

If x is not a number or if base is given, then x must be a string,
bytes, or bytearray instance representing an integer literal in the
given base.  The literal can be preceded by '+' or '-' and be surrounded
by whitespace.  The base defaults to 10.  Valid bases are 0 and 2-36.
Base 0 means to interpret the base from the string as an integer literal.
>>> int('0b100', base=0)
4

现在写一个函数：

def hello():
    print("hello")
hello()

输出：
hello

hello??

Signature: hello()
Source:   
def hello():
    print("hello")
File:      f:\jupyter\10-cef34a745e0e>
Type:      function

%在IPython中是一个非常具有魔力的命令下面就举几个例子：

• 单个%对本行作用
• %% 对多行其作用

查看语句的执行时间：

%timeit[i for i in range(10)]

1.91 µs ± 541 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

清空全部变量

%rest

%run *.py运行脚本文件

查看魔术命令

%【魔术命令】？

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