The difference between the From module import and import

Recently in the use of Codecademy to learn python, encountered some problems wrong, small record

If the From math import sqrt is the method of sqrt as this file import, use only need to call sqrt directly.

If import is import math, then the call should be made in a math.sqrt manner.

So what if you define a function of the same name in your own file?

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frommath import sqrt def sqrt(n):     return n printsqrt(13689) raw_input()

Run the Py file output 13689, so you define the function will automatically block out.

So a large number of references to import math.* is a good way, from the math import * is prone to error, of course, the use of a very small number of functions and the above method will be more appropriate.

In addition Python does not support import math.sqrt like Java

The difference between the From module import and import