How can I modify the point at which python decides to print in scientific notation?
我如何修改python决定用科学符号打印的点?
E.g. I'd like everything > 1e4 or < 1e-4 to be printed in scientific notation.
我希望> 1e4或< 1e-4都用科学符号打印。
Good:
好:
In [11]: 5e20
Out[11]: 5e+20
Bad:
缺点:
In [12]: 5e10
Out[12]: 50000000000.0
2 个解决方案
#1
11
In IPython you can use
在IPython中，您可以使用
%precision %.4g
this will print floating point values who's absolute value is < 1e-4 or >= 1e4 in scientific notation.
这将打印浮点值，其绝对值在科学表示法中为< 1e-4或>= 1e4。
You can find more information about the %precision command in the IPython API Docs. For string formatting options have a look at the Python Docs
您可以在IPython API文档中找到关于%precision命令的更多信息。对于字符串格式化选项，请查看Python文档
#2
0
Actually it has nothing to do with IPython as it simply calls __str__. Sadly, float, being a built-in type, is implemented in C and you can't monkeypatch C types. So your only options are modifying __str__ implementation in cpython or patching IPython to be smarter than just calling __str__.
实际上它与IPython没有任何关系，因为它只调用__str__。遗憾的是，float是一个内置类型，它是在C中实现的，您不能使用monkeypatch C类型。因此，您唯一的选择是在cpython中修改__str__实现或修补IPython，使其比仅仅调用__str__更智能。
#1
11
In IPython you can use
在IPython中，您可以使用
%precision %.4g
this will print floating point values who's absolute value is < 1e-4 or >= 1e4 in scientific notation.
这将打印浮点值，其绝对值在科学表示法中为< 1e-4或>= 1e4。
You can find more information about the %precision command in the IPython API Docs. For string formatting options have a look at the Python Docs
您可以在IPython API文档中找到关于%precision命令的更多信息。对于字符串格式化选项，请查看Python文档
#2
0
Actually it has nothing to do with IPython as it simply calls __str__. Sadly, float, being a built-in type, is implemented in C and you can't monkeypatch C types. So your only options are modifying __str__ implementation in cpython or patching IPython to be smarter than just calling __str__.
实际上它与IPython没有任何关系，因为它只调用__str__。遗憾的是，float是一个内置类型，它是在C中实现的，您不能使用monkeypatch C类型。因此，您唯一的选择是在cpython中修改__str__实现或修补IPython，使其比仅仅调用__str__更智能。